Coupled Vortex Oscillations in Spatially Separated Permalloy Squares

被引：61

作者：

Vogel, Andreas ^{[1
,2
]}

Kamionka, Thomas ^{[1
,2
]}

Martens, Michael ^{[1
,2
]}

Drews, Andre ^{[1
,2
,3
]}

Chou, Kang Wei ^{[4
]}

Tyliszczak, Tolek ^{[4
]}

Stoll, Hermann ^{[5
]}

Van Waeyenberge, Bartel ^{[6
]}

Meier, Guido ^{[1
,2
]}

机构：

[1] Univ Hamburg, Inst Angew Phys, D-20355 Hamburg, Germany

[2] Univ Hamburg, Zentrum Mikrostrukturforsch, D-20355 Hamburg, Germany

[3] Univ Hamburg, Arbeitsbereich Tech Informat Syst, D-22527 Hamburg, Germany

[4] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

[5] Max Planck Inst Metallforsch, D-70569 Stuttgart, Germany

[6] Univ Ghent, Dept Solid State Sci, B-9000 Ghent, Belgium

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 13期

关键词：

DOTS;

D O I：

10.1103/PhysRevLett.106.137201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We experimentally study the magnetization dynamics of pairs of micron-sized permalloy squares coupled via their stray fields. The trajectories of the vortex cores in the Landau-domain patterns of the squares are mapped in real space using time-resolved scanning transmission x-ray microscopy. After excitation of one of the vortex cores with a short magnetic-field pulse, the system behaves like coupled harmonic oscillators. The coupling strength depends on the separation between the squares and the configuration of the vortex-core polarizations. Considering the excitation via a rotating in-plane magnetic field, it can be understood that only a weak response of the second vortex core is observed for equal core polarizations.

引用

页数：4

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