High frequency spin-torque-oscillators with reduced perpendicular torque effect based on asymmetric vortex polarizer

被引：35

作者：

Carpentieri, M. ^{[1
]}

Martinez, E. ^{[2
]}

Finocchio, G. ^{[3
]}

机构：

[1] Univ Calabria, Dept Elettron Informat & Sistemist, I-87036 Arcavacata Di Rende, CS, Italy

[2] Univ Salamanca, Dept Fis Aplicada, E-37008 Salamanca, Spain

[3] Univ Messina, Dept Fis Materia & Ingn Elettron, I-98100 Messina, Italy

来源：

JOURNAL OF APPLIED PHYSICS | 2011年 / 110卷 / 09期

关键词：

MAGNETIC TUNNEL-JUNCTIONS; DRIVEN; MULTILAYERS; EXCITATION; DEPENDENCE; PERMALLOY; VORTICES; EMISSION; WAVES; LAYER;

D O I：

10.1063/1.3657844

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In this paper it is demonstrated micromagnetically the possibility to have high frequency and high power microwave emission at zero field in magnetic tunnel junctions with an off-centered vortex polarizer for current densities smaller than 10(7) A/cm(2). We found power spectra characterized by two harmonics (around 6 GHz and 12 GHz) where the second one has the larger power. Due to the non-uniform configuration of the polarizer, the effect of the perpendicular torque is partially compensated by the Oersted field. Our predictions give rise to the design of a more compact and easily embedded spin-torque oscillators for all-on-chip applications. (C) 2011 American Institute of Physics. [doi:10.1063/1.3657844]

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页数：4

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