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 o...

中文翻译：

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PtMn/[Co/Ni] 异质结构中的自旋轨道扭矩和 Dzyaloshinskii-Moriya 相互作用

反铁磁体 (AFM)/铁磁体 (FM) 异质结构具有破坏的反转对称性，被认为为非易失性自旋电子器件开辟了新的机会。先前对此类系统的研究表明，异质结构中出现了自旋轨道扭矩 (SOT)，其强度足以导致磁化反转。破坏反转对称性和自旋轨道耦合的影响也导致 Dzyaloshinskii-Moriya 相互作用（DMI）的出现，它控制着磁构型和磁化反转。在这项工作中，我们研究了具有反铁磁 PtMn 层和铁磁 [Co/Ni] 多层的异质结构中 SOT 诱导的有效场和 DMI，并将结果与​​参考 Pt/[Co/Ni] 系统进行比较。