Optical detection of vortex spin-wave eigenmodes in microstructured ferromagnetic disks

被引：31

作者：

Vogt, K. ^{[1
,2
,3
]}

Sukhostavets, O. ^{[4
]}

Schultheiss, H. ^{[1
,2
,5
]}

Obry, B. ^{[1
,2
]}

Pirro, P. ^{[1
,2
]}

Serga, A. A. ^{[1
,2
]}

Sebastian, T. ^{[1
,2
,3
]}

Gonzalez, J. ^{[4
]}

Guslienko, K. Y. ^{[4
,6
]}

Hillebrands, B. ^{[1
,2
]}

机构：

[1] Tech Univ Kaiserslautern, Fachbereich Phys, D-67663 Kaiserslautern, Germany

[2] Tech Univ Kaiserslautern, Forschungszentrum OPTIMAS, D-67663 Kaiserslautern, Germany

[3] Grad Sch Mat Sci Mainz, D-55128 Mainz, Germany

[4] Univ Basque Country, Dept Fis Mat, E-20018 San Sebastian, Spain

[5] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

[6] Basque Fdn Sci, IKERBASQUE, E-48011 Bilbao, Spain

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 17期

关键词：

STATE STABILITY; CORE REVERSAL; EXCITATION;

D O I：

10.1103/PhysRevB.84.174401

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We examine the excitation of spin-wave eigenmodes in the vortex state of microsized ferromagnetic circular dots made of Permalloy (Ni81Fe19) both theoretically and experimentally using Brillouin light scattering microscopy. We report on the detection of the radial spin-wave eigenmodes of single elements with high mode number (up to n = 13 for the largest disk radius 2.5 mu m). Theoretically we obtain an equation for the eigenfrequencies valid for arbitrary dot aspect ratios (thickness/radius) within the magnetostatic approximation. We demonstrate the influence of the disk radius on the spatial mode profiles, in particular, changes in the pinning of the dynamical magnetization at the edges and in the center of the disks. The measured spin-wave eigenfrequencies are in good agreement with our calculations for the disks with different radii.

引用

页数：6

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