Excitation and detection of short-waved spin waves in ultrathin Ta / CoFeB / MgO-layer system suitable for spin-orbit-torque magnonics

Excitation and detection of short-waved spin waves in ultrathin Ta / CoFeB / MgO-layer system suitable for spin-orbit-torque magnonics
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适用于自旋轨道扭矩磁振子学的超薄 Ta/CoFeB/MgO 层系统中短波自旋波的激发和检测

DOI:
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发表时间:
2017
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影响因子:
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通讯作者:
G. Gaudin
G. Gaudin
中科院分区:
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文献类型:
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作者:
T. Brächer;M. Fabre;T. Meyer;T. Fischer;O. Boulle;U. Ebels;P. Pirro;G. Gaudin

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我们报告了在由超薄面内磁化 Co8Fe72B20 (CoFeB) 制成的自旋波波导中波矢量高达约 40 radμm−1 的短波自旋波的激发和检测。 CoFeB 被纳入 Ta/CoFeB/Mgo 的层堆叠中,该层系统具有大的自旋轨道扭矩和大的垂直磁各向异性常数。短波自旋波由纳米共面波导激发,并通过自旋整流和微聚焦布里渊光散射光谱进行检测。我们表明,大的垂直磁各向异性极大地有利于自旋波寿命,其寿命与没有界面阻尼的体系统相当。所提出的结果为磁振子学成功扩展到具有大自旋轨道扭矩的超薄不对称层堆栈铺平了道路。
We report on the excitation and detection of short-waved spin waves with wave vectors up to about 40 radμm−1 in spin-wave waveguides made from ultrathin, in-plane magnetized Co8Fe72B20 (CoFeB). The CoFeB is incorporated in a layer stack of Ta/CoFeB/Mgo, a layer system featuring large spin orbit torques and a large perpendicular magnetic anisotropy constant. The short-waved spin waves are excited by nanometric coplanar waveguides and are detected via spin rectification and microfocussed Brillouin light scattering spectroscopy. We show that the large perpendicular magnetic anisotropy benefits the spin-wave lifetime greatly, resulting in a lifetime comparable to bulk systems without interfacial damping. The presented results pave the way for the successful extension of magnonics to ultrathin asymmetric layer stacks featuring large spin orbit torques.
DOI: 10.1038/nmat3459
发表时间: 2012-12-01
期刊: NATURE MATERIALS
影响因子: 41.2
作者:
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