Picosecond magnetization dynamics in nanomagnets: Crossover to nonuniform precession

被引：86
作者：
Kruglyak, VV
Barman, A
Hicken, RJ
Childress, JR
Katine, JA
机构：
[1] Univ Exeter, Sch Phys, Exeter EX4 4QL, Devon, England
[2] Hitachi Ltd, Global Storage Technol, San Jose Res Ctr, San Jose, CA 95120 USA
来源：
PHYSICAL REVIEW B | 2005年 / 71卷 / 22期
关键词：
D O I：
10.1103/PhysRevB.71.220409
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The picosecond magnetization dynamics of arrays of square Ni88Fe12/Co80Fe20 bilayer nanoelements were studied by optical pump-probe measurements. Experimentally observed modes were found to fall upon two branches, with a crossover from the high- to low-frequency regime as the element size was reduced to less than 220 nm. Micromagnetic simulations revealed that the branches are associated with center and edge modes. The edge mode is found to dominate as the element size is reduced so that the magnetic response to a pulsed field becomes less spatially uniform.
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