In nanoscale magnetic multilayers, capping layers are often used to protect the underlying magnetic layers from oxidation. However, little research has investigated possible long-range coupling interactions between nonmagnetic transition metal (TM) capping layers and neighboring magnetic layers. In this paper, the temperature (T) dependence of the magnetic moment of different thicknesses of cobalt (Co) was studied in a tantalum (Ta)/Co/TM trilayer structure with four TM capping layers, where the TMs were Ta, Chromium (Cr), titanium (Ti), and zirconium (Zr), respectively. It was found that the capping layer had a large effect on the phase-transition behavior and thermal stability of the Co layer. In the Ta and Cr layers, the T-dependence of Co magnetic moment showed nonmonotonic behavior, and in the Ti and Zr layers, the Co M-T curve exhibited very few effects of the capping layer. We attribute this phenomenon to the long-range coupling between the Co and TM layers. Furthermore, the coupling mechanism was linked to the indirect magnetic exchange coupling in Co/TM multilayers, similar to the Ruderman-Kittel-Kasuya-Yoshida coupling. The results of this work will support further development of the understanding of the coupling between the 3d ferromagnetic (FM) metal and nonmagnetic TM at nanoscales. Relative to potential applications, it will inspire us to rediscover the role of both the TM capping layer and buffer nonmagnetic layer in FM/TM multilayers, especially for nanoscale magnetic multilayers with spin-dependent effects, such as spin valves, spin halls, spin transfer torque, and spin–orbit coupling, which are in widespread use in the manufacture of various spintronics devices.In nanoscale magnetic multilayers, capping layers are often used to protect the underlying magnetic layers from oxidation. However, little research has investigated possible long-range coupling interactions between nonmagnetic transition metal (TM) capping layers and neighboring magnetic layers. In this paper, the temperature (T) dependence of the magnetic moment of different thicknesses of cobalt (Co) was studied in a tantalum (Ta)/Co/TM trilayer structure with four TM capping layers, where the TMs were Ta, Chromium (Cr), titanium (Ti), and zirconium (Zr), respectively. It was found that the capping layer had a large effect on the phase-transition behavior and thermal stability of the Co layer. In the Ta and Cr layers, the T-dependence of Co magnetic moment showed nonmonotonic behavior, and in the Ti and Zr layers, the Co M-T curve exhibited very few effects of the capping layer. We attribute this phenomenon to the long-range coupling between the Co and TM layers. Furthermore, the coupling mechanism was ...

中文翻译：

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非磁性过渡金属覆盖层与相邻磁性层之间的长程耦合相互作用

在纳米级磁性多层膜中，通常使用覆盖层来保护下面的磁性层免受氧化。然而，很少有研究调查非磁性过渡金属 (TM) 覆盖层和相邻磁性层之间可能的长程耦合相互作用。在本文中，在具有四个 TM 覆盖层的钽 (Ta)/Co/TM 三层结构中研究了不同厚度钴 (Co) 磁矩的温度 (T) 依赖性，其中 TM 为 Ta、铬 ( Cr)、钛 (Ti) 和锆 (Zr)。发现覆盖层对 Co 层的相变行为和热稳定性有很大影响。在 Ta 和 Cr 层中，Co 磁矩的 T 依赖性表现出非单调行为，而在 Ti 和 Zr 层中，Co MT 曲线显示出极少的覆盖层影响。我们将这种现象归因于 Co 和 TM 层之间的长程耦合。此外，耦合机制与 Co/TM 多层膜中的间接磁交换耦合有关，类似于 Ruderman-Kittel-Kasuya-Yoshida 耦合。这项工作的结果将支持进一步发展对纳米级 3d 铁磁 (FM) 金属和非磁性 TM 之间耦合的理解。相对于潜在的应用，它将激励我们重新发现 TM 覆盖层和缓冲非磁性层在 FM/TM 多层膜中的作用，特别是对于具有自旋相关效应的纳米级磁性多层膜，如自旋阀、自旋霍尔、自旋转移扭矩和自旋轨道耦合，在各种自旋电子器件的制造中广泛使用。在纳米级磁性多层中，覆盖层通常用于保护下面的磁性层免受氧化。然而，很少有研究调查非磁性过渡金属 (TM) 覆盖层和相邻磁性层之间可能的长程耦合相互作用。在本文中，在具有四个 TM 覆盖层的钽 (Ta)/Co/TM 三层结构中研究了不同厚度钴 (Co) 磁矩的温度 (T) 依赖性，其中 TM 为 Ta、铬 ( Cr)、钛 (Ti) 和锆 (Zr)。发现覆盖层对 Co 层的相变行为和热稳定性有很大影响。在 Ta 和 Cr 层中，Co 磁矩的 T 依赖性表现出非单调行为，并且在 Ti 和 Zr 层中，Co MT 曲线表现出极少的覆盖层影响。我们将这种现象归因于 Co 和 TM 层之间的长程耦合。此外，耦合机制是...