Numerical Study of Magnetic Dynamics in Nanoscale Magnets Yunpeng Wang and X. F. Han

1. Numerical Study of Magnetic Dynamics in Nanoscale Magnets Yunpeng Wang and X. F. Han Group M02, State Key Laboratory of Magnetism Institute of Physics, CAS Damping is an important concept in magnetic dynamics, especially in spin-polarized current induced magnetization switching. Generalized LLG equation takes conduction electron effect into accout and is used to numerically simulate the dynamics in nanoscale magnets. Abstract The generalized LLG equation[1] includes contribution from conducting electrons and the damping is anisotropic and non-local. Up Left Figure: Threshold velocity of magnetic vortex core switching in nanodots simulated by generalized LLG equation is consistent with that by original LLG equation[4]. Down Left Figure: Velocity of transverse domain wall traveling in nanostrips dependent on magnetic field, no systemically difference between original and generalized LLG equation is confirmed. Conclusion In the above two studied systems, the damping contributed by conduction electrons is not proved to play determinant role. More systems are under investigation. This project was supported by NSFC, MOST, and CAS [1] Shufeng Zhang, et. al., Phys. Rev. Lett. 102 (2009) 086601 [2] Y. Tserkovnyak, et. al., Phys. Rev. Lett. 88 (2002) 117601 [3] K. Yu, et. al., Phys. Rev. Lett. 100 (2008) 027203 http://www.m02group.com