Current-induced vortex dynamics and pinning potentials probed by homodyne detection

被引：43

作者：

Kim, J. -S. ^{[1
]}

Boulle, O. ^{[1
]}

Verstoep, S. ^{[1
]}

Heyne, L. ^{[1
]}

Rhensius, J. ^{[1
,6
]}

Klaeui, M. ^{[1
,7
,8
]}

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

Kronast, F. ^{[3
]}

Mattheis, R. ^{[4
]}

Ulysse, C. ^{[5
]}

Faini, G. ^{[5
]}

机构：

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

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

[3] Helmholtz Zentrum Berlin Mat & Energie GmbH, Berlin, Germany

[4] Inst Photon Technol eV, Jena, Germany

[5] CNRS, Phynano Team, Lab Photon & Nanostruct, Marcoussis, France

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

[7] Ecole Polytech Fed Lausanne, Lab Nanomagnetism & Spin Dynam, CH-1015 Lausanne, Switzerland

[8] Paul Scherrer Inst, SwissFEL, CH-5232 Villigen, Switzerland

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 10期

基金：

瑞士国家科学基金会; 欧洲研究理事会;

关键词：

DOMAIN-WALL; CORE; STATE; EXCITATION; MOTION; DISKS; FIELD;

D O I：

10.1103/PhysRevB.82.104427

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using a homodyne detection scheme, we show that we can determine the polarity and chirality of a magnetic vortex in an asymmetric magnetic disk as well as the resonance frequency and phase shift of the dynamic vortex gyration excited by a spin-polarized current. From systematic phase measurements, we deduce the relative contributions of the spin torque and the Oersted field, which is found to dominate the excitation. Local pinning sites in the disk lead to an increased resonance frequency and a reduced amplitude. This allows us to draw a map of the pinning sites and thus to characterize the full potential in the disk.

引用

页数：7

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