Selective tuning of magnetization dynamics damping in Tb- and Nd-doped permalloy ultrathin films by adjacent copper nanolayers
Selective tuning of magnetization dynamics damping in Tb- and Nd-doped permalloy ultrathin films by adjacent copper nanolayers
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通过相邻铜纳米层选择性调节 Tb 和 Nd 掺杂坡莫合金超薄膜中的磁化动力学阻尼
DOI：
10.1016/j.jallcom.2016.02.129
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发表时间：
2016-07
影响因子：
6.2
通讯作者：
Zhai Y
中科院分区：
文献类型：
--
作者：
Zhang Dong;Yue Jinjin;Jiang Sheng;Zhai Ya;Zhai Ya;Du Jun;Zhai Hongru;Zhai Y
通过实验和理论拟合，研究了不同铜层厚度的坡莫合金薄膜中Tb和Nd稀掺杂的铁磁共振线宽的角度依赖性机制，并考虑了内禀自旋轨道耦合、非均匀展宽和双磁振子散射的贡献.结果表明，随着铜层厚度从1 nm增加到15 nm，NiFe-Nd和NiFe-Tb薄膜的阻尼系数α分别从0.0153和0.0193增加到0.0261，前者是由于NiFe-Nd（或Tb）/Cu界面的自旋泵浦效应引起的，而后者是由铁磁共振线宽提取的本征贡献。结果表明，表面磁各向异性常数K1呈现由正到负逐渐减小的趋势，说明铜层的存在降低了表面垂直各向异性。在NiFe-Tb/Cu界面和Cu/NiFe-Nd界面，自旋混合电导率分别为（2.72 ± 0.18）× 1015 cm − 2和（2.4 ± 0.2）× 1015 cm − 2。
The mechanism of angular dependence of ferromagnetic resonance linewidth of dilute Tb and Nd doping in permalloy thin films with various thicknesses of adjacent copper layer are investigated by experimental approach and theoretical fitting by considering the contributions from intrinsic spin-orbit coupling, inhomogeneous broadening and two-magnon scattering. The results show that the damping coefficient α, by intrinsic contribution extracted from ferromagnetic resonance linewidth, increases from 0.0153 to 0.0218 for NiFe–Nd films and from 0.0193 to 0.0261 for NiFe–Tb films resulting from the spin pumping effect at the interface of NiFe–Nd(or Tb)/Cu as the thickness of copper layer increases from 1 nm to 15 nm. The surface magnetic anisotropy constantK1is obtained and shows an decreasing trend from positive to negative, which implies that the copper layer could reduce the surface perpendicular anisotropy. The fitting spin mixed conductivity is (2.72 ± 0.18) × 1015cm−2at NiFe–Tb/Cu interface and (2.4 ± 0.2) × 1015cm−2at Cu/NiFe–Nd interface, respectively.
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影响因子：
4
作者：
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