Auto-oscillation threshold and line narrowing in MgO-based spin-torque oscillators

被引：15

作者：

Cornelissen, S. ^{[1
]}

Bianchini, L. ^{[2
,3
]}

Hrkac, G. ^{[4
]}

Op de Beeck, M. ^{[1
]}

Lagae, L. ^{[1
]}

Kim, Joo-Von ^{[2
,3
]}

Devolder, T. ^{[2
,3
]}

Crozat, P. ^{[2
,3
]}

Chappert, C. ^{[2
,3
]}

Schrefl, T. ^{[4
]}

机构：

[1] IMEC, B-3001 Louvain, Belgium

[2] Univ Paris 11, Inst Elect Fondamentale, CNRS, UMR 8622, F-91405 Orsay, France

[3] Univ Paris 11, F-91405 Orsay, France

[4] Univ Sheffield, Dept Mat Engn, Sheffield S1 4DU, S Yorkshire, England

来源：

EPL | 2009年 / 87卷 / 05期

关键词：

DRIVEN; EMISSION;

D O I：

10.1209/0295-5075/87/57001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present an experimental study of the power spectrum of current-driven magnetization oscillations in MgO tunnel junctions under low bias. We find the existence of narrow spectral lines, down to 8MHz in width at a frequency of 10.7GHz, for small applied fields with clear evidence of an auto-oscillation threshold. Micromagnetics simulations indicate that the excited mode corresponds to an edge mode of the synthetic antiferromagnet. Copyright (C) EPLA, 2009

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页数：4

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