Direct observation of closure domain wall mediated spin waves
Direct observation of closure domain wall mediated spin waves
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DOI：
10.1063/1.4927598
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发表时间：
2015-07-27
影响因子：
4
通讯作者：
McCord, Jeffrey
中科院分区：
文献类型：
--
作者：
Mozooni, Babak;McCord, Jeffrey
论证了磁畴壁对自旋波的产生和引导。自旋波从固定和振荡磁闭畴壁辐射，并沿着由周围180度不对称布洛赫畴壁形成的狭窄路径线性传播。通过皮秒时间分辨率的时间分辨磁光克尔显微镜可以直接观察自旋波的传播模式。激发频率、波长和每个域的自旋波数之间存在线性关系。得到了与场激励频率无关的自旋波传播的恒定相速度。自旋波特性可以通过改变磁域动力学来调整，允许随磁场特性和历史变化的自旋波特性。(C) 2015 AIP出版有限责任公司
The generation and guiding of spin waves from and by magnetic domain walls are demonstrated. The spin waves radiate from pinned and oscillating magnetic closure domain walls and propagate linearly along a narrow path formed by the surrounding 180 degrees asymmetric Bloch domain walls. The propagating spin wave modes are directly visualized by time-resolved magneto-optical Kerr microscopy with picosecond temporal resolution. A linear relationship between excitation frequency, wavelength, and number of spin waves per domain exists. Independent of the field excitation frequency, a constant phase velocity of spin waves propagation is obtained. Spin waves characteristics can be tuned by varying the magnetic domain dynamics, allowing for variable spin wave characteristics with magnetic field characteristics and histories. (C) 2015 AIP Publishing LLC.