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 http:// www.m02group.com Damping is an important concept in magnetic dyna mics, especially in spin-polarized current induced magnetization sw itching. Generalized LLG equation takes conduction electron effect into accout and is used to numerically simulate the dynamics in nan oscale magnets. [1] Shufeng Zhang, et. al., Phys. Rev. Lett. 102 (20 09) 086601 [2] Y. Tserkovnyak, et. al., Phys. Rev. Lett. 88 (20 02) 117601 [3] K. Yu, et. al., Phys. Rev. Lett. 100 (2008) 027 The generalized LLG equation [1] includes contribution from conducting electrons and the damping is anisotropic and non-local. In the above two studied systems, the damping contributed by conduction electrons is not proved to play determinant role. More systems are under investigation. Conclusion This project was supported by NSFC, MOST, and CAS Up Left Figure: Threshold vel ocity of magnetic vortex core switching in nanodots simulat ed by generalized LLG equatio n is consistent with that by original LLG equation [4] . Down Left Figure: Velocity of transverse domain wall travel ing in nanostrips dependent o n magnetic field, no systemic ally difference between origi nal and generalized LLG equat ion is confirmed. 0 ,, ˆ ˆ - ( ) t t i xyz t t eﬀ D m m m m m m m D m Abstract

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

Download PPT Report

Upload
belden
View
46
Download
1

Tags:

Embed Size (px)

DESCRIPTION

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. - PowerPoint PPT Presentation

Citation preview

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

Group M02, State Key Laboratory of MagnetismInstitute of Physics, CAS

http://www.m02group.c

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.

[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

The generalized LLG equation[1] includes contribution from conducting electrons and the damping is anisotropic and non-local.

In the above two studied systems, the damping contributed by conduction electrons is not proved to play determinant role. More systems are under investigation.

Conclusion

This project was supported by NSFC, MOST, and CAS

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.

0, ,

ˆ- ( )

t ti x y z

t teff

D m m m m

m m m D m

Abstract