Artificial band structure in anisotropic magnetic vortex crystals

被引：10

作者：

Vogel, Andreas ^{[1
,2
]}

Haenze, Max ^{[1
,2
]}

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

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, D-22527 Hamburg, Germany

来源：

PHYSICAL REVIEW B | 2014年 / 89卷 / 10期

关键词：

D O I：

10.1103/PhysRevB.89.104403

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The gyrotropic eigenmodes in magnetic vortex crystals are studied by means of broadband ferromagnetic-resonance measurements. An artificial crystal structure is realized with two staggered ellipses as building block. Making use of the anisotropic field dependence of the vortex resonance frequency in a ferromagnetic ellipse, distinct resonance modes can be observed that are easily tunable via a small magnetic bias field. The gap between the modes can be continuously adjusted. In the presence of dipolar interaction, a bending and shifting of the modes is observed. A rigid particle model is adopted to analytically describe the experimental results. Calculations for the crystal basis reveal an anticrossing of the resonance modes depending on the vortex-core polarization configuration.

引用

页数：5