Decrease of nonlinearity and linewidth narrowing in spin-transfer oscillators under the external field applied near the hard axis

被引：25

作者：

Mizushima, K. ^{[1
]}

Nagasawa, T. ^{[1
]}

Kudo, K. ^{[1
]}

Saito, Y. ^{[1
]}

Sato, R. ^{[1
]}

机构：

[1] Toshiba Co Ltd, Corp Res & Dev Ctr, Saiwai Ku, Kawasaki, Kanagawa 2128582, Japan

来源：

APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 15期

关键词：

demagnetisation; magnetic anisotropy; magnetic tunnelling; magnetoelectronics; oscillations; red shift; spin polarised transport;

D O I：

10.1063/1.3111435

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Angular dependence of power spectra is measured for tunnel-type spin-transfer oscillators by changing the direction of the external field in the plane. The oscillation frequency shows the red shift with increasing the current in the case that the field directions are away from the hard axis of the free layer. The frequency shift changes from red to blue at a specific direction near the hard axis, where the linewidth is much reduced. These results are explained by taking into account the nonlinearity arising from the in-plane anisotropy as well as that arising from the demagnetizing effect.

引用

页数：3

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