Role of Magnetic Field in Self-Oscillation of Nanomagnet Excited by Spin Torque

Author

Taniguchi, Takafumi ; Tamaru, Shingo ; Arai, Hiroyuki ; Tsunegi, Sumito ; Kubota, Hajime ; Imamura, Hiroshi

Author_Institution

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

Volume

50

Issue

11

fYear

2014

fDate

Nov. 2014

Firstpage

1

Lastpage

4

Abstract

The critical current of the self-oscillation of a spin torque oscillator consisting of a perpendicularly magnetized free layer and an in-plane magnetized pinned layer was studied by solving the Landau-Lifshitz-Gilbert equation. We found that the critical current diverged at certain field directions, indicating that the self-oscillation does not occur at these directions. It was also found that the sign of the critical current changed depending on the applied field direction.

Keywords

critical currents; magnetic tunnelling; magnetisation; magnetoelectronics; nanomagnetics; oscillators; Landau-Lifshitz-Gilbert equation; critical current; in-plane magnetized pinned layer; magnetic field; nanomagnet self-oscillation; perpendicularly magnetized free layer; spin torque oscillator; Critical current density (superconductivity); Magnetic tunneling; Magnetomechanical effects; Oscillators; Perpendicular magnetic anisotropy; Torque; Critical current; 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.2014.2326186

Filename

6971315