Simulation and Stability Analysis of Current and Transverse Field Effects on Spin Transfer Noise

Author

Wang, Li ; Han, Guchang ; Zheng, Yuankai ; Liu, Bo

Author_Institution

Data Storage Inst., Singapore

Volume

43

Issue

6

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

2313

Lastpage

2315

Abstract

The spin transfer modified Landau-Lifshitz-Gilbert equation is used to model a permalloy bar with configurations for current, transverse field, and magnetizations resembling those of a read head. The trends of noise power and noise peak frequency against sensing currents and transverse fields with different polarities are calculated and analyzed by symmetry and asymmetry properties, by magnetization dynamics, and by extended linear stability analysis that is applicable to shape anisotropy. With the linear stability analysis, it is found that smaller track width (with aspect ratio fixed) has larger field stability and larger current-density stability

Keywords

Permalloy; current density; magnetic heads; magnetic noise; magnetic recording; stability; asymmetry properties; current density stability; extended linear stability analysis; magnetization dynamics; modified Landau-Lifshitz-Gilbert equation; noise peak frequency; permalloy bar modelling; read heads; spin transfer noise; transverse field effects; Analytical models; Equations; Frequency; Magnetic analysis; Magnetic anisotropy; Magnetic heads; Magnetic properties; Noise shaping; Perpendicular magnetic anisotropy; Stability analysis; Spin transfer noise; stability analysis; thermal noise;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2007.893704

Filename

4202833