Dependence of anisotropy and damping on shape and aspect ratio in micron sized Ni81Fe19 elements

被引：12
作者：
Barman, A
Kruglyak, VV
Hicken, RJ
Scott, J
Kundrotaite, A
Rahman, M
机构：
[1] Univ Exeter, Sch Phys, Exeter EX4 4QL, Devon, England
[2] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland
来源：
JOURNAL OF APPLIED PHYSICS | 2004年 / 95卷 / 11期
关键词：
D O I：
10.1063/1.1687273
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have studied magnetic anisotropy and damping in Ni81Fe19 elements of different shape and aspect ratio by time-resolved scanning Kerr effect microscopy and micromagnetic simulations. Square elements show a fourfold anisotropy that becomes weaker with increasing aspect ratio. Square elements with aspect ratio <230 show an anisotropy of the apparent damping that becomes stronger with decreasing aspect ratio. Variations in the apparent damping may be understood in terms of dephasing of spin wave modes that leads to the appearance of fringes in time-resolved magnetic images. (C) 2004 American Institute of Physics.
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页码：6998 / 7000
页数：3
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