Lecture image placeholder

Premium content

Access to this content requires a subscription. You must be a premium user to view this content.

Monthly subscription - $9.99Pay per view - $4.99Access through your institutionLogin with Underline account
Need help?
Contact us
Lecture placeholder background
VIDEO DOI: https://doi.org/10.48448/p5dm-2x39

technical paper

MMM 2022

November 07, 2022

Minneapolis, United States

Dynamics of 3D topological spin textures

The push into three dimensions in nanomagnetic systems is a growing theme in basic nanomagnetism research and potential spintronics devices. In two dimensions, magnetic Skyrmions are an established platform to explore the physics of real-space topological spin textures. In three dimensions, the analogous spin texture is the recently observed magnetic Hopfion 1. A Hopfion is a toroidal spin texture equivalent to a Skyrmion string twisted and closed into a torus (fig. 1). 3D magnetic systems are also predicted to host additional novel spin textures including Skyrmion tubes, chiral bobbers, and torons. These 3D spin textures, which have so far only been observed statically, now hold promise for dynamical studies. Investigating transitions between these novel 3D spin textures under applied magnetic fields or currents is within reach with experimental studies with time-resolved x-ray microscopy and scattering techniques. (fig. 2). I will present numerical calculations investigating how the dynamics of Hopfions and related 3D spin textures couple to their topology 2. This work has implications for experimental design and 3D spintronic device engineering. This work was funded by the US DOE, Office of Science, Basic Energy Sciences under Contract No. DE-AC02-05-CH11231. References
1 N. Kent et al., “Creation and observation of Hopfions in magnetic multilayer systems,” Nature Communications, vol. 12, no. 1, p. 1562, 2021, doi: 10.1038/s41467-021-21846-5. 2 D. Raftrey and P. Fischer, “Field-Driven Dynamics of Magnetic Hopfions,” Physical Review Letters, vol. 127, no. 25, p. 257201, Dec. 2021, doi: 10.1103/PhysRevLett.127.257201.

(a) Magnetization color map of a Hopfion at the z=0 plane.
(b) Magnetization color map of Hopfion at the y=0 plane.
(c) Hopfion spin textures with linked magnetization isosurfaces. The Hopf invariant or linking number, Q, is the number of times the isosurfaces are linked.
(d) Detail of Hopfion vortex rings.
(e) Magnetization color map of a toron at the z=0 plane.
(f) Magnetization color map of toron at the y=0 plane.
(g) Toron spin textures with unlinked isosurfaces. A toron has Q=0.
(h) Detail of toron Bloch points (monopole antimonopole pair).

(a) Power Spectral Density response of a Hopfion to a field pulse under static applied external field.
(b) Magnetic excitation pulse applied in the x direction in the time domain. Pulsed field is the cardinal sign or sinc function.
(c) Fourier transform of the excitation pulse in the frequency domain. The sinc function creates a square wave with equal sampling frequency up to a maximum frequency of 15 GHz.


Transcript English (automatic)

Next from MMM 2022

Identifying Axion Insulator by Quantized Magnetoelectric Effect in Antiferromagnetic MnBi2Te4 Tunnel Junction
technical paper

Identifying Axion Insulator by Quantized Magnetoelectric Effect in Antiferromagnetic MnBi2Te4 Tunnel Junction

MMM 2022

Yu-hang Li
Yu-hang Li and 1 other author

07 November 2022

Stay up to date with the latest Underline news!

Select topic of interest (you can select more than one)


  • All Lectures
  • For Librarians
  • Resource Center
  • Free Trial
Underline Science, Inc.
1216 Broadway, 2nd Floor, New York, NY 10001, USA

© 2023 Underline - All rights reserved