Micromagnetic study of a single-domain grain dynamics in magnetic recording media

Author

Elidrissi, Moulay Rachid ; Bastrukov, S. ; Hong Tao Wang ; Jun Yong Khoo ; Kheong Sann Chan ; Eason, Kwaku

Author_Institution

Data Storage Inst. (DSI), Agency for Sci., Technol. & Res. (A*STAR), Singapore, Singapore

fYear

2012

fDate

Oct. 31 2012-Nov. 2 2012

Firstpage

1

Lastpage

2

Abstract

This work reports a micromagnetic study of relaxation and switching of a single-domain-grain magnetization in the effective magnetic field of recording media. Based on the modified Landau-Lifshitz equation of micromagnetic dynamics, we have computed the relaxation time as a function of material-dependent constants of the magnetization precession damping, which is attributed in our model to the coupling between magnetization-vector and stress-tensor of magnetic anisotropy of recording media. We found that the recording media characterized by parameters, revealed in presented simulations, can respond to ac microwave field by ultrafast relaxation and switching in picoseconds regime.

Keywords

magnetic anisotropy; magnetic recording; magnetic relaxation; magnetic switching; magnetisation; micromagnetics; tensors; Landau-Lifshitz equation; ac microwave field; magnetic anisotropy; magnetic field; magnetic recording media; magnetization precession damping; magnetization-vector; material-dependent constants; micromagnetic dynamics; relaxation time; single-domain grain dynamics; single-domain-grain magnetization; stress tensor; ultrafast relaxation; ultrafast switching; Magnetization; Magnetomechanical effects; Magnetostatics;

fLanguage

English

Publisher

ieee

Conference_Titel

APMRC, 2012 Digest

Conference_Location

Singapore

Print_ISBN

978-1-4673-4734-1

Type

conf

Filename

6407606