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The 15th Joint MMM-INTERMAG Conference (2022 Joint) 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 plenary session, and an evening session, with about 1500 presentations overall. This Conference provides an outstanding opportunity for worldwide participants to meet their colleagues and collaborators and discuss developments in all areas of magnetism research.

The 2022 Joint Conference will offer both in-person and prerecorded on-demand content.

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2022 Joint MMM-INTERMAG

Nonreciprocal electrical transport responses arise in materials with broken inversion and time-reversal symmetries [1]. Although these nonlinear magnetoresistance or Hall effects are typically weak compared with their linear analogs, they can be used to probe exotic properties like spin-orbit interaction, spin textures and superconductivity. At the surface of the 3D topological insulator (TI) Bi2Se3, a nonlinear planar Hall effect (NPHE) was reported to exist due to the hexagonally warped spin structures [2]. This NPHE is expected to be small at low carrier densities because the hexagonal warping effect is negligible at the Dirac point. In this study, we observed a similar NPHE in Bi2Se3/CoFeB and magnetic insulator/Bi2Se3 heterostructures. Though with a lower carrier density, the NPHE in these systems is two orders of magnitude larger than the previously reported one. Moreover, the strength of this NPHE scales inversely with carrier density. This suggests that the intrinsic hexagonal warping is not the dominant mechanism for the observed NPHE. Instead, we attribute this large NPHE to the recently proposed extrinsic mechanism based on the interplay between current-induced spin-polarization and scattering from spin-momentum locking inhomogeneities [3]. Our results provide experimental evidence for this new mechanism and show that the NPHE can be enhanced by disorder engineering.

![](https://s3.eu-west-1.amazonaws.com/underline.prod/uploads/markdown_image/1/image/a5ea6152d1cf679c7030c2ca6f2fb62d.jpg)

Fig. 1 Nonlinear planar Hall effect in a YIG(2.46m)/Bi2Se3(8nm) sample.

![](https://s3.eu-west-1.amazonaws.com/underline.prod/uploads/markdown_image/1/image/895b64111427635788c6e4f435603dcd.jpg)

Fig. 2 Carrier density dependence of the nonlinear planar Hall effect.

Nonlinear planar Hall effect from spin-momentum locking inhomogeneities in topological insulator Bi2Se3

technical paper

Brillouin Light Scattering from Quantized Spin Waves in Nanowires with Antisymmetric Exchange Interactions

Unravelling the details of the magnetic texture of skyrmion tubes in three dimensions

Influence of Ga+ Ion Irradiation on Skyrmion Motion

Facilitating Skyrmion Nucleation in Ir/Co/Pt Multilayers With Ga+ Ion Irradiation

Broadband terahertz spectroscopy of anisotropic magnetoresistance reveals intrinsic contributions

DC voltage generated by the unidirectional spin Hall magnetoresistance in the spin torque ferromagnetic resonance spectrum

Alloying effect on auto-oscillation properties of W100-xTax/CoFeB/MgO spin Hall nano-oscillators

Field-free Spin-orbit Torque-driven Multistate Switching of Canted GdCo Moments

Low power spin-orbit torque magnetization switching in all-sputtered BiSb topological insulator / perpendicularly magnetized CoPt / MgO multilayers on Si substrate

Development of an Optically-Gated Fe/n-GaAs Spin-Polarised Transistor

https://d3smihljt9218e.cloudfront.net/transcript/29746/subtitle/6beff7fb82fdba43589a7ea36cb0a2bd.vtt

English (automatic)

Nonlinear planar Hall effect from spin-momentum locking inhomogeneities in topological insulator Bi2Se3

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Brillouin Light Scattering from Quantized Spin Waves in Nanowires with Antisymmetric Exchange Interactions

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