Relationship between nonadiabaticity and damping in permalloy studied by current induced spin structure transformations

被引：72

作者：

Heyne, L. ^{[1
]}

Klaeui, M. ^{[1
]}

Backes, D. ^{[1
]}

Moore, T. A. ^{[1
]}

Krzyk, S. ^{[1
]}

Ruediger, U. ^{[1
]}

Heyderman, L. J. ^{[2
]}

Rodriguez, A. Fraile ^{[3
]}

Nolting, F. ^{[3
]}

Mentes, T. O. ^{[4
]}

Nino, M. A. ^{[4
]}

Locatelli, A. ^{[4
]}

Kirsch, K. ^{[5
]}

Mattheis, R. ^{[5
]}

机构：

[1] Univ Konstanz, Fachbereich Phys, D-78457 Constance, Germany

[2] Paul Scherrer Inst, Lab Micro & Nanotechnol, CH-5232 Villigen, Switzerland

[3] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[4] Sincrotrone Trieste, I-34012 Trieste, Italy

[5] Inst Photon Technol, D-07702 Jena, Germany

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.100.066603

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

By direct imaging we determine spin structure changes in Permalloy wires and disks due to spin transfer torque as well as the critical current densities for different domain wall types. Periodic domain wall transformations from transverse to vortex walls and vice versa are observed, and the transformation mechanism occurs by vortex core displacement perpendicular to the wire. The results imply that the nonadiabaticity parameter beta does not equal the damping alpha, in agreement with recent theoretical predictions. The vortex core motion perpendicular to the current is further studied in disks revealing that the displacement in opposite directions can be attributed to different polarities of the vortex core.

引用

页数：4

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