Spin-transfer excitations of permalloy nanopillars for large applied currents

被引：55

作者：

Kiselev, SI ^{[1
]}

Sankey, JC ^{[1
]}

Krivorotov, IN ^{[1
]}

Emley, NC ^{[1
]}

Garcia, AGF ^{[1
]}

Buhrman, RA ^{[1
]}

Ralph, DC ^{[1
]}

机构：

[1] Cornell Univ, Ithaca, NY 14853 USA

来源：

PHYSICAL REVIEW B | 2005年 / 72卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.72.064430

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using measurements of the spectra of microwave-frequency resistance oscillations, we determine the room-temperature phase diagram of magnetic excitations caused by torques from dc spin-polarized currents in (thin permalloy)/copper/(thick permalloy) multilayer samples. We extend the measurements to larger values of current than have been reported previously. We find several additional modes that we are able to identify with motion of the thick magnetic layer as well as the thin one. Peaks in the microwave spectra at multiple frequencies suggest that spatially nonuniform dynamical states can be important in some circumstances. We compare the experimental phase diagram with simple theoretical models and achieve a good qualitative agreement.

引用

页数：10

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