Enhanced antiferromagnetic resonance linewidth in NiO/Pt and NiO/Pd
Enhanced antiferromagnetic resonance linewidth in NiO/Pt and NiO/Pd
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DOI：
10.1103/physrevb.101.060402
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发表时间：
2020-02
影响因子：
3.7
通讯作者：
T. Moriyama;Kensuke Hayashi;Keisuke Yamada;M. Shima;Y. Ohya;Y. Tserkovnyak;T. Ono
中科院分区：
文献类型：
--
作者：
T. Moriyama;Kensuke Hayashi;Keisuke Yamada;M. Shima;Y. Ohya;Y. Tserkovnyak;T. Ono
在本文中，我们研究了具有NiO/HM界面的烧结NiO-HM（其中HM是重金属）颗粒系统中反铁磁阻尼的增强，其中$\mathrm{HM}=\mathrm{Pt}$或Pd。在自旋泵浦模型的假设下，我们推导出有效界面阻尼电导${g}_{\mathrm{eff}}$，该参数表征自旋泵浦效应的上限估计，为$12\ifmmode\pm\else\textpm\fi{}1\phantom{\rule{0.16em}{0ex}}\mathrm{n}{\mathrm{m}}^{\ensuremath{-}2}$ 和$5\ifmmode\pm\else\textpm\fi{}1\phantom{\rule{0.16em}{0ex}}\mathrm{n}{\mathrm{m}}^{\ensuremath{-}2}$ 分别用于室温下的 NiO/Pt 和 NiO/Pd 界面。这项研究中通过实验得出的${g}_{\mathrm{eff}}$是反铁磁自旋电子学的一个重要里程碑，为涉及自旋混合电导的反铁磁体的各种自旋电流转移和自旋相互作用现象提供了指导。
In this paper, we investigate the enhancement of the antiferromagnetic damping in the sintered NiO-HM (where HM is heavy metal) granular systems having NiO/HM interfaces, where $\mathrm{HM}=\mathrm{Pt}$ or Pd. Under the assumption of the spin pumping model, we derive the effective interfacial damping conductance ${g}_{\mathrm{eff}}$, the parameter which characterizes the upper-bound estimate of the spin pumping effect, to be $12\ifmmode\pm\else\textpm\fi{}1\phantom{\rule{0.16em}{0ex}}\mathrm{n}{\mathrm{m}}^{\ensuremath{-}2}$ and $5\ifmmode\pm\else\textpm\fi{}1\phantom{\rule{0.16em}{0ex}}\mathrm{n}{\mathrm{m}}^{\ensuremath{-}2}$ for the NiO/Pt and the NiO/Pd interfaces, respectively, at room temperature. ${g}_{\mathrm{eff}}$ experimentally derived in this study are an important milestone in antiferromagnetic spintronics, giving a guideline for various spin current transfer and spin interaction phenomena with antiferromagnets where the spin mixing conductance is involved.