Enhanced magnetic damping in La0.7Sr0.3MnO3 capped by normal metal layer
Enhanced magnetic damping in La0.7Sr0.3MnO3 capped by normal metal layer
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DOI：
10.1063/1.4931383
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发表时间：
2015-09-01
期刊：
影响因子：
1.6
通讯作者：
Cherif, S. M.
中科院分区：
文献类型：
--
作者：
Luo, G. Y.;Belmeguenai, M.;Cherif, S. M.
采用脉冲激光沉积技术在SrTiO3衬底上生长了La0.7Sr0.3MnO3（LSMO）和Pt包覆La0.7Sr0.3MnO3 20 nm厚薄膜。然后利用微带线铁磁共振（MS-FMR）技术研究了它们的磁动态特性，特别是基于微波吸收线宽的频率依赖性测量了阻尼常数。结果表明：LSMO(20nm)/Pt（5.5nm）的有效阻尼常数是LSMO（20nm）的3倍，薄膜呈现弱的面内单轴各向异性；由于Pt的封盖作用，磁阻尼常数的增强是Pt层产生自旋电流的表现。此外，自旋电流在LSMO(20nm)/Pt（5.5nm）体系中诱发了逆自旋霍尔效应（ISHE），使用9.8 GHz激励频率的腔内FMR测量。ISHE与微波功率的线性关系验证了双层体系中自旋抽运的机理。(C) 2015作者。除另有说明外，所有文章内容均采用知识共享署名3.0未移植许可协议。
La0.7Sr0.3MnO3(LSMO) and Pt capped La0.7Sr0.3MnO3 20 nm thick films have been grown on SrTiO3 substrates by pulsed laser deposition. Microstrip line ferromagnetic resonance (MS-FMR) technique is then used to investigate their magnetic dynamic properties and to particularly measure the damping constant based on the frequency dependence of microwave absorption linewidth. The results show that the effective damping constant of LSMO(20nm)/Pt(5.5nm) is three times larger than that of LSMO(20nm) and the films present weak in-plane uniaxial anistropy. The enhancement of the magnetic damping constant due to the capping of Pt is the manifestaction of the generation of spin current in Pt layer. Furthermore, the spin current induces an inverse spin Hall effect (ISHE) in LSMO(20nm)/Pt(5.5nm) system, measured using the FMR in cavity with 9.8 GHz excitation frequency. The linear dependence of ISHE on microwave power validates the mechenism of spin pumping in this bilayer system. (C) 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.