Precise probing spin wave mode frequencies in the vortex state of circular magnetic dots

被引：29
|
作者：
Awad, A. A. [1 ]
Guslienko, K. Y. [3 ,4 ]
Sierra, J. F. [1 ]
Kakazei, G. N. [5 ]
Metlushko, V. [2 ]
Aliev, F. G. [1 ]
机构：
[1] Univ Autonoma Madrid, Dept Fis Mat Condensada, CIII, E-28049 Madrid, Spain
[2] Univ Illinois, Dept Elect & Comp Engn, Chicago, IL 60607 USA
[3] Univ Basque Country, Dept Fis Mat, Donostia San Sebastian 20018, Spain
[4] Basque Fdn Sci, IKERBASQUE, Bilbao 48011, Spain
[5] Univ Porto, Dept Fis, Fac Ciencias, IFIMUP & IN Inst Nanosci & Nanoterchnol, P-4169007 Oporto, Portugal
来源：
APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 01期
关键词：
ferromagnetic materials; ferromagnetic resonance; ground states; magnetic particles; nanostructured materials; Permalloy; spin dynamics; vortices; ARRAYS; FIELD;
D O I：
10.1063/1.3268453
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report on detailed broadband ferromagnetic resonance measurements of azimuthal and radial spin wave excitations in circular Permalloy dots in the vortex ground state. Dots with aspect ratio (beta=height over radius) varied from 0.03 to 0.1 were explored. The frequency splitting of two lowest azimuthal modes was observed. The experimentally observed dependence of the frequency splitting on beta was reasonably well described by dynamic splitting model accounting the spin waves and vortex gyrotropic mode interaction.
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页数：3
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