United States

Although materials exhibiting exchange bias (EB) phenomena have found use in many modern technologies[1], [2], much of their underlying physics remain highly debated.
For bulk alloys, EB cannot be understood within the context of interfacial antiferromagnetic (AFM) / ferromagnetic (FM) interactions[3]. Rather, for certain Mn-rich Heusler alloys, EB is
better understood within the context of many different exotic magnetic interactions[4], [5]. For the Mn-Ni-Ga system, excess Mn can fill free Ni / Ga lattice sites leading to competing FM /
AFM type interactions[6]. Competition is believed to govern EB effect in these systems. Considering the common valence structure and smaller radius of Cr atoms, it is interesting to study
the effect of Mn-Cr swapping. The smaller Cr atoms should reduce nearest neighbor bond radii and promote AFM behavior. Here we report on a set of Ni2Mn1.4-xCrxGa0.6 (0.00 ≤ x ≤
0.40) compounds fabricated via standard arc-casting and annealing procedures. At dilute Cr content, x ≤ 0.10, AFM interactions in the system were enhanced. This behavior resulted in
enhanced EB properties of the system. The x = 0.10 sample exhibited maximum EB fields of HEB ~ 723 Oe and HEB ~ 300 Oe for ZFC / FCC conditions respectively. For higher Cr
content, the FM response of the system was enhanced, and a secondary precipitate was observed as the bulk of the samples began to reject new Cr atoms. The observed EB phenomena of
samples containing Cr content in excess of x = 0.25 was suppressed significantly. Relevant structural, compositional, and magnetic data will be presented for the Ni2Mn1.4-xCrxGa0.6
system.&lt;br&gt;

**References:**&lt;br&gt;

[1] M. Bibes, J. Villegas and A. Barthelemy, Adv. Phys., Vol. 60, p.5-84 (2011)&lt;br&gt;
[2] C. Tsang, R. Fontana and T. Lin, IEEE Trans. Magn., Vol. 30, p.3801-3806 (1994)&lt;br&gt;
[3] J. Nogués and I. Schuller, J. Magn. Magn. Mater., Vol. 192, p.203-232 (1999)&lt;br&gt;
[4] M. Khan and A. Albagami, J. All. Comp., Vol. 727, p.100-106 (2017)&lt;br&gt;
[5] Y. Zhang, J. Li, and F. Tian, Intermetallics, Vol. 107, p.10-14 (2019)&lt;br&gt;
[6] P. Lazpita, J. M. Barandiaran and J. Feuchtwanger, J. Phys.: Conf. Ser., Vol. 325, p.012016 (2011)&lt;br&gt;



MMM 2022

Exchange Bias Properties of Cr Doped Ni2Mn1.4 xCrxGa0.6 Heusler Alloys

Although materials exhibiting exchange bias (EB) phenomena have found use in many modern technologies[1], [2], much of their underlying physics remain highly debated.
For bulk alloys, EB cannot be understood within the context of interfacial antiferromagnetic (AFM) / ferromagnetic (FM) interactions[3]. Rather, for certain Mn-rich Heusler alloys, EB is
better understood within the context of many different exotic magnetic interactions[4], [5]. For the Mn-Ni-Ga system, excess Mn can fill free Ni / Ga lattice sites leading to competing FM /
AFM type interactions[6]. Competition is believed to govern EB effect in these systems. Considering the common valence structure and smaller radius of Cr atoms, it is interesting to study
the effect of Mn-Cr swapping. The smaller Cr atoms should reduce nearest neighbor bond radii and promote AFM behavior. Here we report on a set of Ni2Mn1.4-xCrxGa0.6 (0.00 ≤ x ≤
0.40) compounds fabricated via standard arc-casting and annealing procedures. At dilute Cr content, x ≤ 0.10, AFM interactions in the system were enhanced. This behavior resulted in
enhanced EB properties of the system. The x = 0.10 sample exhibited maximum EB fields of HEB ~ 723 Oe and HEB ~ 300 Oe for ZFC / FCC conditions respectively. For higher Cr
content, the FM response of the system was enhanced, and a secondary precipitate was observed as the bulk of the samples began to reject new Cr atoms. The observed EB phenomena of
samples containing Cr content in excess of x = 0.25 was suppressed significantly. Relevant structural, compositional, and magnetic data will be presented for the Ni2Mn1.4-xCrxGa0.6
system. 

**References:** 

[1] M. Bibes, J. Villegas and A. Barthelemy, Adv. Phys., Vol. 60, p.5-84 (2011) 
[2] C. Tsang, R. Fontana and T. Lin, IEEE Trans. Magn., Vol. 30, p.3801-3806 (1994) 
[3] J. Nogués and I. Schuller, J. Magn. Magn. Mater., Vol. 192, p.203-232 (1999) 
[4] M. Khan and A. Albagami, J. All. Comp., Vol. 727, p.100-106 (2017) 
[5] Y. Zhang, J. Li, and F. Tian, Intermetallics, Vol. 107, p.10-14 (2019) 
[6] P. Lazpita, J. M. Barandiaran and J. Feuchtwanger, J. Phys.: Conf. Ser., Vol. 325, p.012016 (2011)

poster

#### Welcome to the 67th Annual Conference on Magnetism and Magnetic Materials, MMM 2022!

The Conference was held from October 31 to November 4 and offers both in-person and on-demand content.

MMM 2022 is sponsored jointly by AIP Publishing and the IEEE Magnetics Society. Members of the international scientific and engineering communities interested in recent developments in fundamental and applied magnetism are invited to attend and contribute to the technical sessions. The technical program will include invited and contributed papers in oral and poster sessions, invited symposia, a tutorial, and several special sessions. This Conference provides an outstanding opportunity for worldwide participants to meet their colleagues and collaborators and discuss developments in all areas of magnetism research.

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For tickets to the event, please register at the following link: https://magnetism.org/registration

Please register for the MMM 2022 conference to join the event.

This Conference provides an outstanding opportunity for worldwide participants to meet their colleagues and collaborators and discuss developments in all areas of magnetism research.

Synthetic antiferromagnetic nanoplatelets (NPs) with perpendicular magnetic anisotropy (PMA) are promising candidates for nano-torque-related applications [1]. To
manipulate the NPs, a good understanding of the homogeneity in magnetic and structural properties is required. Most techniques measure these properties based on ensemble techniques
[2], however, an efficient and easy magnetic characterization technique on single particle level, down to the nanometer range, is currently lacking.
Here, we present a characterization method based on photothermal magnetic circular dichroism (PT MCD), which measures the differential absorption of left and right circularly polarized
light of an individual magnetic nanoparticle due to the polar Kerr effect [3]. In this way the hysteresis loop on a single 120 nm diameter SAF NP is obtained (see Fig 1b). When compared
to SQUID (of ~106 particles) as shown in Fig. 1c, the loop exhibits comparable behavior i.e., the antiferromagnetic state at zero applied field and a sharp magnetization switch at a large
field. We notice that the values of the switching fields (BL and BH as schematically represented in Fig. 1b) are different from the SQUID measurement, which is due to the increased
temperature of the NP during the PT MCD measurement. The statistics of the switching fields by PT MCD are shown in Fig 1d where a difference in the distribution is observed for the BH
and BL switch, which we attribute to a change in the dominant magnetic reversal mechanism of the NPs [4].
Our results will pave the way to a deeper understanding of torque based applications using PMA-SAF NPs and introduce the PT MCD method to the magnetic-nanoparticle community [5]. 

**References:** 

[1] Mansell, R., et al. Scientific reports 7.1 (2017): 1-7. 
[2] Wasielewski, M. R., et al. Nature Reviews Chemistry 4.9 (2020): 490-504. 
[3] Spaeth, Patrick, et al. Nano letters 22.9 (2022): 3645-3650. 
[4] Thomson, T., et al. Physical review letters 96.25 (2006): 257204. 
[5] Adhikari, S, Li, J., et al. In-Preparation (2022) 

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Magnetization Switching of Single 120 nm Diameter Synthetic Antiferromagnetic Nanoplatelets with Perpendicular Magnetic Anisotropy

Nanomotors —such as drug delivery vehicles or self-assembled structures requires efficient manipulation of nanoparticle motion. Magnetic field manipulation provides a
contactless and sensitive solution to the issue.
Here, magnetic nanowires (MNWs) of various lengths and radii were fabricated via electrochemical deposition into nanoporous templates. As a working electrode one side of templates
was sputtered with a Cu film. Suspensions were created by removing the MNWs from the template firstly by etching away the Cu film, and then dissolving the template in NaOH. The
MNWs were then rinsed several times with deionized water, then redispersed using ultrasonic agitation and placed into the liquid to be studied. A rotating external magnetic field can apply
a magnetic torque to balance the drag torque, caused by liquid, and rotate the MNWs in sync with the field. Magnetic torque arises when the magnetic field is not parallel to the nanowires.
In addition, nanowire size has large effect on their rotation speed - a longer MNW will experience slower acceleration and larger drag, while a MNW with larger diameter rotates faster. At
low frequency rotations of the magnetic field, the nanowires rotate synchronously with the applied field. When the frictional torque exceeds the magnetic torque, the MNW no longer
synchronizes with the rotating external field. When the driving field frequency is very high the nanowire will keeps oscillating around its position. By exploring MNW diameters from 20-
200nm and lengths from 1-5μm and rotation frequencies from 60-200rpm in liquids from aqueous to viscous (including cryopreservation agents for the new field of nanowarming organs
and tissues), a phase diagram of MNW control has been created.

Magnetic nanowires rotation in suspension under the influence of magnetic field

Magnetic iron oxide nanoparticles have been extensively studied in the biomedical field due to their diverse application such as magnetic hyperthermia, targeted drug
delivery. Recently, larger magnetic particles with a vortex ground state has been recognized as useful biomedical materials, because of high saturation magnetization and wider tunability of
a particle size from sub-100 nm to submicrometer scale. The vortex particles showed a high heating efficiency, which is comparable to that of superparamagnetic nanoparticles and is
enhanced with the number of vortices [1,2]. However, spin reorientation process under alternating fields, for submicron particles in particular, has not been fully understood, though the
understanding is of crucial importance for the improvement of the biomedical performance. Here, we report results of magnetic hysteresis scaling for hollow Fe3O4 spherical submicron
particles with a vortex structure [3,4]. A scaling coefficient is deduced from the power law scaling and examined to elucidate the relation with particle morphology.
We examined hollow Fe3O4 spherical particles with varying 400-700 nm diameter [4]. A set of symmetrical minor loops were measured with increasing field amplitude step-by-step up to
2 kOe. Fig. 1 shows a typical example of a hysteresis scaling at T = 300 K for various particle sizes. The relation between hysteresis loss and remanence of minor loops follows a power law
with an exponent of ~1.5 in a limited field range (< ~ 500 Oe), where a vortex state is stabilized. Such exponent was universally obtained for other particle size and in a wide temperature
range of 10-300 K. As shown in the inset, the scaling coefficient monotonically decreases with increasing inner/outer diameter ratio and temperature, indicating a decrease of domain wall
pinning strength [5] and an increasing vortex mobility under alternating fields. The results demonstrate that the scaling coefficient is an useful physical parameter for evaluating a vortex
mobility in a ferromagnetic particle. 

**References:** 

[1] N. A. Usov, et al., Sci. Rep. 8, 1224 (2018). 
[2] D. W. Wong, et al., Nanoscale Res. Lett. 14, 376 (2019). 
[3] N. Hirano, et al., Appl. Phys. Lett. 119, 132401 (2021). 
[4] M. Chiba et al., J. Magn. Magn. Mater. 512, 167012 (2020). 
[5] S. Kobayashi et al., J. Appl. Phys. 107, 023908 (2010). 

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Magnetic vortex mobility for hollow Fe3O4 submicron particles studied by a hysteresis scaling technique

Body Magneto-acoustic devices, integrating ferri- and ferro-magnetic materials with surface and bulk acoustic wave transducers, are of interest for nonlinear signal processing
applications such as frequency selective and tunable filtering, signal correlation and isolation [1-3]. Typically, the devices are fabricated by sputter depositing the piezoelectric material
needed for acoustic transduction onto the magnetic substrate. Lack of epitaxy as well as thermal budget constraints in the sputtering processes, however, restrict the combinations of
piezoelectric and magnetic materials possible for these devices. In this work, we present an alternate fabrication approach based on heterogeneous integration whereby the acoustic
transducer is grown on an epitaxially suitable substrate and subsequently transferred to the desired magnetic material [4], allowing for device design and performance to be optimized
unhindered by process limitations. A magnetoelastic high overtone bulk acoustic resonator (ME-HBAR) is implemented as an example device, as shown in Fig. 1. A GaN acoustic
transducer with a top Al electrode is grown on epitaxially compatible 4H-SiC and released for transfer onto a Cu/YIG substrate by etching a sacrificial NbN layer. Cu serves as the bottom
electrode of the acoustic transducer and an acoustic matching layer.
The frequency response of the ME-HBAR is measured as a function of magnetic field vector. Two representative responses corresponding to zero field and Bx = 56 mT (in-plane
component) and Bz = 180 mT (normal component) are shown in Fig. 2. Around 2.75 GHz, the resonant acoustic modes are strongly attenuated and shifted in frequency due to hybridizing
with spin wave modes of similar frequency and wavelength to form coupled magneto-elastic waves [5]. Sufficiently far from the crossover region (not shown), the frequency shift is
attributed to the ΔE effect, which together with the lossy hybridization region may be used to realize tunable bandpass and notch filters respectively. 

**References:** 

1. X. Liang, C. Dong, H. Chen, et al., Sensors, Vol. 20 p. 1532 (2020) 
2. Y Li, C. Zhao, W. Zhang, et al., APL Materials, Vol. 9, art. 060902 (2021) 
3. M. Frommberger, Ch. Zanke, A. Ludwig, et al., Microelectronic Engineering, Vol. 67, p. 588 (2003) 
4. B. Downey, A. Xie, S. Mack, et al., IEEE 2020 Device Research Conference, p. 1 (2020) 
5. C. Kittel, Phys. Rev., Vol. 110, p. 836 (1958) 

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Heterogeneously Integrated Magneto Acoustic Resonators

High-entropy alloys (HEAs), instead of employing one or two main constituents like in traditional alloy development, adopt a different design concept where it combines a blend of multi-principal elements in large concentrations. This design idea enables them with large values of configurational entropy of mixing and a vast compositional space which offers a huge window of exploration opportunities. Magnetocaloric HEAs have been limited to low-temperature range or showing sub-par performance till recent extensions to the first-generation equiatomic HEA design approach have been devised [1, 2]. The magnetocaloric performance of equiatomic magnetocaloric HEAs heavily depends on the choice of element selection and thus the likelihood of relying on the rare-earth (RE) elements due to their intrinsic large magnetic moments. Extending beyond the equiatomic point towards non-equiatomic in the HEA region combined with directed search strategies, overcomes the above-mentioned limitations of magnetocaloric HEAs: the low temperature limit is improved (48 % increase as displayed in Fig 1) and â‰¥ 5-fold performance enhancement (Fig 2) [3-5]. In this talk, we will show the various design strategies of magnetocaloric HEAs and how to tackle the vast HEA space to tune for the desired magnetocaloric properties. Work supported by Grant PID2019-105720RB-I00 funded by MCIN/AEI/ 10.13039/501100011033. Additional support ConsejerÃ­a de EconomÃ­a, Conocimiento, Empresas y Universidad de la Junta de AndalucÃ­a (grant P18-RT-746), US Air Force Office of Scientific Research (FA8655-21-1-7044) and Sevilla University under VI PPIT-US program.

Tuning in the vast high entropy alloy space for competitive magnetocaloric properties

Magnetic elastomers are flexible smart materials that can be manipulated by magnetic fields to achieve reversible mechanical deformation. These highly configurable materials are instrumental in transforming biomedical applications such as artificial muscles, dampeners, and other vibration absorbers. Magnetic elastomer structures must be customizable to satisfy these complex applications leading to the use of fused filament fabrication (FFF) in creating them. FFF is a 3D printing process where material is extruded in 1D lines (infill) to build 2D planes layer-by-layer, resulting in a 3D structure. This research used magnetoactive testing to investigate how varying the internal infill structure affected the mechanical response of the structures within an applied magnetic field. Different infill percentages and infill orientations were tested to account for different mechanical stiffnesses and internal geometries. The elastomers were made by adding 40wt% magnetite (Fe3O4) to a thermoplastic polyurethane (TPU) matrix. Each sample was magnetoactively tested with three different transverse magnetic field orientations (Front, Back and Top). The samples were placed between two electromagnets, and the angle of deflection was recorded as a function of applied field. Maximum angles of deflection for the testing setup were reached when both lower infill percentages, translating to less material in the cross-section of the sample, and lower infill orientations, creating much less crosslinking between infill lines, were used. Transverse fields applied parallel to the print plane (Front, Back sample orientations) demonstrated the most magnetoaction due to less crosslinking constraining the bending stiffness. The anisotropy of the infill structure likely also contributed to the large response from certain samples. It was concluded that for this fixed base material, it is more important to 3D print structures with lower stiffnesses than more net magnetic particulate in achieving the most magnetoaction. According to this data, 3D printed magnetite-TPU structures are viable for creating components easily stimulated by a magnetic field unlocking many possibilities for the creation of useful technological components.

Magnetoactive Properties of 3D Printed Magnetic Elastomer Structures: Effects of Infill Orientation and Infill Percentage

Magnetic elastomers are composite smart materials made up of a flexible polymer and magnetic particulate which mechanically actuate in response to an applied magnetic field (H). They allow for a highly configurable and untethered actuator. To enhance configurability, 3D-Printing allows for great control of the objects meso and macro structure, both in terms of shape geometry and property anisotropy. Specifically, Fused Filament Fabrication (FFF) is a process by which material is extruded in lines (infill) to gradually build up an object through layer-by-layer extrusion. In this study, we explore how multiple FFF structural parameters (infill orientation and infill percentage, and sample orientation relative to H) affect the magnetoactive response of printed Strontium Ferrite (SrF) magnetic elastomer structures. Magnetic elastomers with hard magnetic particulate have the unique advantage of performing more complex actuation, such as rolling, twisting and folding. SrF is an excellent hard magnet candidate given its lower price and greater accessibility compared to NdFeB. Magnetoactive properties are measured by a custom setup where each printed sample beam is suspended and optically tracked for a transverse H up to 0.4 T. For each sample, multiple orientations relative to H are studied. A custom program overlays the digital images for increasing H in order to quantify the magnetoactive deformation that results. The magnetoactive responses exhibited by the various sample types highlight clear design goals for tailoring large and complex magnetoactive actuation modes. In addition to the traditional transverse bending seen from typical (soft) magnetic elastomers, we also observe complex twisting and torquing of the beams in multiple dimensions based upon the printed structure and the sample orientation relative to H. These effects are greatest for the orientations and structures that maximize magnetic anisotropy and minimize the infill crosslinking. This work demonstrates the clear potential to tailor complex magnetoactive responses from FFF-printed hard magnetic elastomers, opening the door to highly complex actuators that can be readily and accessibly designed and created.

Complex Magnetoactuation of 3D Printed Hard Magnetic Elastomers: Effects of Infill Orientation and Percentage

Magnetic elastomers can mechanically deform under a magnetic field. Hard magnetic elastomers can perform more complex motions, but soft magnetic elastomers have a greater magnetoaction. 3D printing, such as Fused Deposition Modeling (FDM), can enhance the magnetoactive properties of magnetic elastomers by creating anisotropy. 3D printing filaments are the stock material for FDM. Recent work has shown that magnetic annealing of magnetic filaments during extrusion creates greater magnetoaction in the filaments. This research studies whether this enhanced performance from magnetically annealed filaments remains once they are extruded through the 3D printing nozzle. The composite samples were made of polyurethane and varying amounts of soft and hard magnetic particulate (carbonyl iron (Fe) and strontium ferrite (SrF)). The composites were extruded into 1.75 mm diameter filaments. Magnetically annealed filaments traveled through a uniform axial magnetic field. Final samples were extruded through a 0.8 mm FDM nozzle into extrudates. The magnetoactive properties were measured by a custom setup, whereby extrudates were hung between electromagnets. Images of samples were captured, overlaid, and analyzed at seven field strengths. The enhanced magnetoactive performance of magnetically annealed filaments was present in the final extrudates, indicating that the magnetic annealing effects were preserved. The higher performance magnetic annealing effects were (1) magnetoaction at lower applied fields for the Fe-containing samples and (2) non-zero magnetoaction in the highest SrF samples. Quantitatively, the least magnetoactive deflection was seen in the highest SrF samples. Mechanical tensile testing data showed that the stiffness of the composite variant increased with a higher percentage of SrF. Magnetically, the samples with more SrF content had lower saturation magnetization (Ms) and higher coercive field (Hc). The high stiffness and magnetic properties contribute to the limited magnetoaction. This approach to magnetic annealing of magnetic elastomers can be used to 3D print accurate and complex components for high-performance soft robotic applications.

Impact of 3D Printing Extrusion on Magnetically Annealed High Performance Hard/Soft Magnetic Elastomers

Considering the natural abundance of the constituting elements and first-order phase transition (FOPT), LaFe13-xSix-derived compounds have been extensively studied for magnetocaloric effect, a phenomenon that causes the cooling or heating of material when placed in an external magnetic field [1]. They are, however, extremely brittle and mechanically friable, showing rather low thermal conductivities and measurable irreversibility, which thus far could not be eliminated completely. Recently, Pathak et al. [2] reported the first-time discovery of a two-phase, naturally formed at the LaFe2Si stoichiometry rather than LaFe13-xSix compound. LaFe2Si exhibits strongly responsive behaviors without the degradation in properties that can be exploited in weak magnetic fields. However, the phase transition happens rather at low temperatures and the saturation moment is low. We are working on this material to further enhance the phase transition temperature and also to improve the magnetic and mechanical properties of the alloy. In this presentation, we will present the synthesis and characterization of LaFe2-yCoySi. We prepared LaFe2-yCoySi by making the first pre-alloy of FeCoSi and then added Co and melted several times. The alloys were further homogenized by the vacuum suction casting technique, which prepared a 4 to 5 cm long rod with a 6mm diameter of sample. The ferromagnetic to paramagnetic transition temperature increases from 199K for x = 0 to 273K for x = 0.3 and the full width at the half-maximum value of magnetic entropy changes increases significantly with Co doping. We discuss the phase transition, electrical transport, magnetic and magnetocaloric properties of LaFe2-yCoySi compounds.

Phase transition, electrical transport and magnetic entropy change of LaFe2 yCoySi alloys prepared by suction casting

The ability to harness excellent magnetic and optical properties within a heterostructure film composed of a magnetic material and a transition metal dichalcogenide (TMD) semiconductor paves a new pathway for the development of multifunctional sensing devices, information storage technology, etc1. Atomically thin tungsten disulfide (WS2) (thickness â‰¤ 5 nm) has been widely explored as a promising candidate for applications in optoelectronics, spintronics, and valleytronics. The valleytronic property of WS2 can be enhanced when interfacing it with another magnetic material such as iron (Fe), due to the magnetic proximity effect2. However, the growth of this 2D-TMD with controllable thickness, using chemical vapor deposition (CVD), and transferring it onto another substrate (Fe) via a commonly used wet transfer process have remained a challenging task. To overcome this, we employ a combination of pulsed laser deposition (PLD) and sputtering (SP) techniques to grow Fe/WS2 heterostructure films with a controlled interface and desirable magnetic/optical properties. A 5nm thick WS2 film was first grown on MgO substrate using PLD, and a 5nm thick Fe film was then deposited on WS2/MgO using SP. A 2nm thick Ta layer was sputtered on the Fe surface to protect the film from oxidization. X-ray diffraction, Raman and Photoluminescence spectroscopy, and atomic force microscopy confirmed the structure of the heterostructure and the quality of the Fe/WS2 interface. Vibrating sample magnetometry, magneto-optical Kerr effect (MOKE), and magnetic force microscopy indicated that the excellent magnetic properties of Fe are preserved in the Ta/Fe/WS2/MgO heterostructure relative to the Ta/Fe/MgO reference film. MOKE showed a sharp, square magnetic hysteresis loop of Ta/Fe/WS2/MgO with a coercive field (Hc ~ 25 Oe) similar to that of the reference film, Ta/Fe/MgO (Hc ~ 23 Oe). The combined excellent magnetic and optical properties make the Ta/Fe/WS2/MgO heterostructure a promising candidate for a wide range of applications in spintronics, valleytronics, and opto-spincaloritronics3. Our study provides a new, efficient method for the growth of novel 2D van der Waals TMD-based heterostructures with controlled interface properties.

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Exchange Bias Properties of Cr Doped Ni2Mn1.4 xCrxGa0.6 Heusler Alloys

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Magnetization Switching of Single 120 nm Diameter Synthetic Antiferromagnetic Nanoplatelets with Perpendicular Magnetic Anisotropy

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