Spin-orbit torques and Dzyaloshinskii-Moriya interaction in PtMn/[Co/Ni] heterostructures
Spin-orbit torques and Dzyaloshinskii-Moriya interaction in PtMn/[Co/Ni] heterostructures
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DOI：
10.1063/1.5005593
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发表时间：
2017-10-30
影响因子：
4
通讯作者：
Ohno, H.
中科院分区：
文献类型：
--
作者：
DuttaGupta, S.;Kanemura, T.;Ohno, H.
反铁磁（AFM）/铁磁（FM）异质结构的反转对称性破缺被认为是打开新的机会，非易失性自旋电子器件。以往的研究表明，这种系统中出现的自旋轨道力矩（SOTs）的异质结构是强大的，足以带来磁化反转。反转对称性破缺和自旋轨道耦合的影响也导致了Dzyaloshinskiii-Moriya相互作用（Dzyaloshinskiii-Moriya interaction）的出现，它控制着磁结构和磁化反转。在这项工作中，我们研究了SOT在具有反铁磁PtMn层和铁磁[Co/Ni]多层膜的异质结构中诱导的有效场和介电常数，并与参考Pt/[Co/Ni]系统的结果进行了比较。磁输运测量揭示了相同的符号和相似的幅度的SOT诱导的有效领域的两个系统，而电流诱导的畴壁运动测量下的面内字段揭示了相反的符号和较小的幅度的PtMn/[Co/Ni]界面相比，Pt/[Co/Ni]。所获得的结果提供了深入的信息有关的表现形式的AFM/FM系统中的自旋轨道相互作用，这是关键的静态磁配置和磁化反转的理解，其可能的应用在反铁磁自旋电子学。出版社：AIP Publishing
Antiferromagnet (AFM)/ferromagnet (FM) heterostructures with broken inversion symmetry are perceived to open new opportunities for nonvolatile spintronic devices. Previous studies of such systems have demonstrated an emergence of spin-orbit torques (SOTs) in the heterostructures which are strong enough to bring about magnetization reversal. The impact of broken inversion symmetry and spin-orbit coupling also leads to an emergence of the Dzyaloshinskii-Moriya interaction (DMI) which governs the magnetic configuration and magnetization reversal. In this work, we study the SOT-induced effective fields and DMI in a heterostructure with an antiferromagnetic PtMn layer and a ferromagnetic [Co/Ni] multilayer and compare the results with a reference Pt/[Co/Ni] system. Magnetotransport measurements reveal the same sign and similar magnitude of SOT-induced effective fields for the two systems while current-induced domain wall motion measurements under in-plane fields reveal the opposite sign and smaller magnitude of DMI at the PtMn/[Co/Ni] interface compared to the Pt/[Co/Ni]. The obtained results offer in-depth information concerning the manifestations of spin-orbit interactions in AFM/FM systems, which is key to understanding of static magnetic configuration and magnetization reversal for their possible applications in antiferromagnetic spintronics. Published by AIP Publishing.