Theoretical Study of Spin-Torque Oscillator with Perpendicularly Magnetized Free Layer

Author

Taniguchi, Takafumi ; Arai, Hiroyuki ; Kubota, Hajime ; Imamura, Hiroshi

Author_Institution

Spintronics Res. Center, Nat. Inst. of Adv. Ind. Sci. & Technol. (AIST), Tsukuba, Japan

Volume

50

Issue

1

fYear

2014

fDate

Jan. 2014

Firstpage

1

Lastpage

4

Abstract

The magnetization dynamics of spin torque oscillator (STO) consisting of a perpendicularly magnetized free layer and an in-plane magnetized pinned layer was studied by solving the Landau-Lifshitz-Gilbert equation. We derived the analytical formula of the relation between the current and the oscillation frequency of the STO by analyzing the energy balance between the work done by the spin torque and the energy dissipation due to the damping. We also found that the field-like torque breaks the energy balance and changes the oscillation frequency.

Keywords

magnetisation; oscillators; Landau-Lifshitz-Gilbert equation; damping; energy balance; energy dissipation; field-like torque; in-plane magnetized pinned layer; magnetization dynamics; oscillation frequency; perpendicularly magnetized free layer; spin-torque oscillator; Damping; Magnetic domain walls; Magnetic tunneling; Magnetization; Magnetomechanical effects; Oscillators; Torque; Landau-Lifshitz-Gilbert (LLG) equation; perpendicularly magnetized free layer; spin torque oscillator (STO); spintronics;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2013.2277582

Filename

6692926