Current-induced magnetization dynamics in current perpendicular to the plane spin valves

被引：76

作者：

Covington, M ^{[1
]}

AlHajDarwish, M ^{[1
]}

Ding, Y ^{[1
]}

Gokemeijer, NJ ^{[1
]}

Seigler, MA ^{[1
]}

机构：

[1] Seagate Res, Pittsburgh, PA 15222 USA

来源：

PHYSICAL REVIEW B | 2004年 / 69卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.69.184406

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We observe magnetization dynamics induced by spin momentum transfer in the noise spectra of current perpendicular to the plane giant magnetoresistance spin valves. The dynamics are observable only for those combinations of current direction and magnetic configuration in which spin transfer acts to reorient the free layer magnetization away from the direction set by the net magnetic field. Detailed measurements as a function of magnetic configuration reveal an evolution of the noise spectra, going from a spectrum with a well-defined noise peak when the free layer is roughly collinear with the pinned layer to a spectrum dominated by 1/f noise when the free layer is in an orthogonal configuration. Finally, the amplitude of the corresponding resistance noise increases rapidly with increasing current until it saturates at a value that is a substantial fraction of the magnetoresistance between parallel and antiparallel states.

引用

页码：184406 / 1

页数：8

共 31 条

[1]

AFONOV VL, 2002, PHYS REV B, V65

[2]

AZALIY YB, 1998, PHYS REV B, V57, pR3213

[3] Current-perpendicular (CPP) magnetoresistance in magnetic metallic multilayers [J].