Out-of-plane current controlled switching of the fourfold degenerate state of a magnetic vortex in soft magnetic nanodots

被引：38
作者：
Choi, Youn-Seok [1 ]
Yoo, Myoung-Woo [1 ]
Lee, Ki-Suk [1 ]
Yu, Young-Sang [1 ]
Jung, Hyunsung [1 ]
Kim, Sang-Koog [1 ]
机构：
[1] Seoul Natl Univ, Dept Mat Sci & Engn, Res Ctr Spin Dynam & Spin Wave Devices, Nanospin Lab,Res Inst Adv Mat, Seoul 151744, South Korea
来源：
APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 07期
关键词：
electron spin polarisation; ferromagnetic materials; magnetic particles; magnetic switching; magnetic transitions; micromagnetics; nanomagnetics; nanostructured materials; Permalloy; soft magnetic materials; SPIN TRANSFER TORQUE; TEMPERATURE; EXCITATION;
D O I：
10.1063/1.3310017
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report on an observation of transitions of the fourfold degenerate state of a magnetic vortex in soft magnetic nanodots by micromagnetic numerical calculations. The quaternary vortex states in patterned magnetic dots were found to be controllable by changing the density of out-of-plane dc or pulse currents applied to the dots. Each vortex state can be switched to any of the other states by applying different sequence combinations of individual single-step pulse currents. Each step pulse has a characteristic threshold current density and direction. This work offers a promising way for manipulating both the polarization and chirality of magnetic vortices.
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页数：3
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