期刊
ACS NANO
卷 5, 期 12, 页码 9559-9565出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn202791g
关键词
single nanomagnets dynamics; time-resolved magneto-optical Kerr effect; magnetization precession; damping; magnetostatic interaction
类别
资金
- Department of Science and Technology, Government of India [SR/NM/NS-09/2007, SR/FTP/PS-71/2007, INT/EC/CMS (24/233552), INT/JP/JST/P-23/09]
- Japan Science and Technology Agency [09158876]
We report an all-optical time-domain detection of picosecond magnetization dynamics of arrays of 50 nm Ni80Fe20 (permalloy) dots down to the single nanodot regime. In the single nanodot regime the dynamics reveals one dominant resonant mode corresponding to the edge mode of the 50 nm dot with slightly higher damping than that of the unpatterned thin film. With the increase in areal density of the array both the precession frequency and damping Increase significantly due to the increase in magnetostatic Interactions between the nanodots, and a mode splitting and sudden jump in apparent damping are observed at an edge-to-edge separation of 50 nm.
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