Ferromagnet structural tuning of interfacial symmetry breaking and spin Hall angle in ferromagnet/heavy metal bilayers
Ferromagnet structural tuning of interfacial symmetry breaking and spin Hall angle in ferromagnet/heavy metal bilayers
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铁磁体/重金属双层中界面对称性破缺和自旋霍尔角的铁磁体结构调整
DOI：
10.1063/1.5063974
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发表时间：
2018-11
影响因子：
4
通讯作者：
Xuepeng Qiu
中科院分区：
文献类型：
--
作者：
Meng Tang;Rajagopalan Ramaswamy;Hyunsoo Yang;Huanglin Yang;Weijia Fan;Zhong Shi;Shiming Zhou;Xuepeng Qiu
研究了铁磁体/重金属双层膜中铁磁体晶体结构对自旋霍尔角的影响。X射线衍射和透射电镜分析表明，与基体/Py/Ta相比，基体/Ta/Py中出现了明显的坡莫合金（Py）（111）织构。自旋矩铁磁共振测量结果表明，衬底/Ta/Py中的面外SHA（θ，与类Rashba有效场相关）是衬底/Py/Ta中的近20倍，而面内SHA（θ，与类自旋Hall有效场相关）没有明显差异。我们归因于FM结构依赖SHA的FM和HM之间的界面对称性破缺，这是调谐的功函数，由于不同的晶体结构的FM。Py（111）结构的出现扩大了界面对称性破缺，从而增强了FM/HM界面的Rashba效应.研究了铁磁晶体结构对铁磁（FM）/重金属（HM）双层膜中自旋霍尔角（SHA）的影响. X射线衍射和透射电镜分析表明，与基体/Py/Ta相比，基体/Ta/Py中出现了明显的坡莫合金（Py）（111）织构。自旋矩铁磁共振测量结果表明，衬底/Ta/Py中的面外SHA（θ，与类Rashba有效场相关）是衬底/Py/Ta中的近20倍，而面内SHA（θ，与类自旋Hall有效场相关）没有明显差异。我们归因于FM结构依赖SHA的FM和HM之间的界面对称性破缺，这是调谐的功函数，由于不同的晶体结构的FM。Py（111）结构的出现扩大了界面对称性破缺，从而增强了FM/HM界面的Rashba效应。
We investigate the influence of ferromagnet crystalline structures on spin Hall angle (SHA) in ferromagnet (FM)/heavy metal (HM) bilayers with reversed stacking order. X-ray diffraction and transmission electron microscopy show that a pronounced permalloy (Py) (111) texture emerges in substrate/Ta/Py compared to that in substrate/Py/Ta. Spin torque ferromagnetic resonance measurements show that the out-of-plane SHA (θ⊥, associated with Rashba-like effective field) is ∼2 times larger in substrate/Ta/Py than that in substrate/Py/Ta, while in-plane SHA (θǁ, associated with spin Hall-like effective field) shows no distinct difference. We ascribe the FM structure dependent SHA to the interfacial symmetry breaking between the FM and HM, which is tuned by the work functions due to different crystalline structures of the FM. The emergence of the Py (111) structure enlarges the interfacial symmetry breaking and consequently enhances the Rashba effect at the FM/HM interface.We investigate the influence of ferromagnet crystalline structures on spin Hall angle (SHA) in ferromagnet (FM)/heavy metal (HM) bilayers with reversed stacking order. X-ray diffraction and transmission electron microscopy show that a pronounced permalloy (Py) (111) texture emerges in substrate/Ta/Py compared to that in substrate/Py/Ta. Spin torque ferromagnetic resonance measurements show that the out-of-plane SHA (θ⊥, associated with Rashba-like effective field) is ∼2 times larger in substrate/Ta/Py than that in substrate/Py/Ta, while in-plane SHA (θǁ, associated with spin Hall-like effective field) shows no distinct difference. We ascribe the FM structure dependent SHA to the interfacial symmetry breaking between the FM and HM, which is tuned by the work functions due to different crystalline structures of the FM. The emergence of the Py (111) structure enlarges the interfacial symmetry breaking and consequently enhances the Rashba effect at the FM/HM interface.
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影响因子：
3.7
作者：
V. Vlaminck;J. Pearson;S. Bader;A. Hoffmann
通讯作者：
V. Vlaminck;J. Pearson;S. Bader;A. Hoffmann
影响因子：
4.6
作者：
Barnes SE;Ieda J;Maekawa S
通讯作者：
Maekawa S
溅射的β-TA/PY双层系统中的异常抗阻尼。
影响因子：
4.6
作者：
Behera N;Chaudhary S;Pandya DK
通讯作者：
Pandya DK
影响因子：
13.6
作者：
Kwon JH;Yoon J;Deorani P;Lee JM;Sinha J;Lee KJ;Hayashi M;Yang H
通讯作者：
Yang H
影响因子：
8.6
作者：
Liu, Luqiao;Moriyama, Takahiro;Buhrman, R. A.
通讯作者：
Buhrman, R. A.