Effect of Gilbert Damping Term on the Current Induced Magnetization Switching of Ring-Shaped Spin Valve Structures

Author

Guo, Jie ; Jalil, Mansoor B. A. ; Tan, Seng Ghee

Author_Institution

Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore

Volume

43

Issue

6

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

2923

Lastpage

2925

Abstract

In this paper, we present a micromagnetic study of the effect of the Gilbert damping term on the magnetization reversal properties of a ring-shaped PSV. The transition between the two stable vortex states of the storage layer is modeled by applying a write current pulse and considering the effects of the Ampere field and spin-transfer torque. The magnetization switching mechanism is investigated for different amplitude and duration of the current pulse. The optimal switching behavior under varying damping coefficient is discussed. We observe that apart from the current pulse amplitude and duration, the damping coefficient also has a significant effect on magnetization switching properties, especially for short current pulses

Keywords

Permalloy; cobalt; copper; ferromagnetic materials; local moments; magnetic storage; magnetic switching; magnetisation reversal; micromagnetics; random-access storage; spin polarised transport; spin valves; Ampere field; FeNi-Co-Cu; Gilbert damping coefficient; MRAM; Permalloy layer; current induced magnetization switching; current pulse amplitude; current pulse duration; local moments; magnetization reversal; magnetoresistance random access memory; micromagnetics; ring-shaped spin valve structures; spin-polarized current; spin-transfer torque; storage layer; vortex state transition; write current pulse; Damping; Geometry; Magnetic properties; Magnetic switching; Magnetization reversal; Magnetoresistance; Micromagnetics; Random access memory; Spin valves; Torque; Damping coefficient; magnetoresistance random access memory (MRAM); spin torque; spin valve;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2007.892587

Filename

4202746