Spin torque driven excitations in a synthetic antiferromagnet

被引：47

作者：

Houssameddine, D. ^{[1
]}

Sierra, J. F. ^{[1
]}

Gusakova, D. ^{[2
]}

Delaet, B. ^{[2
]}

Ebels, U. ^{[1
]}

Buda-Prejbeanu, L. D. ^{[1
,3
]}

Cyrille, M. -C. ^{[2
]}

Dieny, B. ^{[1
]}

Ocker, B. ^{[4
]}

Langer, J. ^{[4
]}

Maas, W. ^{[4
]}

机构：

[1] UJF, INPG, CNRS, SPINTEC,UMR 8191,INAC,CEA, F-38054 Grenoble, France

[2] DIHS, LETI, DRT, CEA,LETI,MINATEC, F-38054 Grenoble, France

[3] Grenoble INP, F-38031 Grenoble, France

[4] Singulus Technol, D-63796 Kahl Main, Germany

来源：

APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 07期

关键词：

antiferromagnetic materials; cobalt alloys; copper; excitons; iron alloys; manganese alloys; nanostructured materials; nickel alloys; platinum alloys; red shift; ruthenium; spin polarised transport;

D O I：

10.1063/1.3314282

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Spin polarized current induced self oscillations have been investigated in both the free layer and the synthetic antiferromagnetic (SAF) pinned layer of spin valve nanopillars. Compared with free layer excitations, the acoustic type SAF excitations are characterized by high emitted power and much narrower linewidth. Furthermore, in contrast to free layer excitations, the SAF in-plane precession mode exhibits an unexpected crossover from redshift (df/dI < 0) to blueshift (df/dI>0) in frequency f versus current I as the in-plane magnetic field is increased. From simulations we identify this crossover as a signature of large amplitude spin current induced precessional dynamics in the SAF.

引用

页数：3

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