arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1609.07320cond-mat.mes-hall
收藏

重金属材料对Pt/Co/重金属三层结构磁性能的影响

Influence of heavy metal materials on magnetic properties of Pt/Co/heavy metal tri-layered structures

Boyu Zhang, Anni Cao, Junfeng Qiao, Minghong Tang, Kaihua Cao, Xiaoxuan Zhao, Sylvain Eimer, Zhizhong Si, Na Lei, Zhaohao Wang, Xiaoyang Lin, Zongzhi Zhang, Min… 展开作者

Boyu Zhang, Anni Cao, Junfeng Qiao, Minghong Tang, Kaihua Cao, Xiaoxuan Zhao, Sylvain Eimer, Zhizhong Si, Na Lei, Zhaohao Wang, Xiaoyang Lin, Zongzhi Zhang, Mingzhong Wu, Weisheng Zhao

摘要:

具有界面垂直磁各向异性(PMA)的Pt/Co/重金属(HM)三层结构目前正处于对几种新兴自旋电子效应(如自旋轨道力矩、畴壁运动和室温Skyrmions)的深入研究中。HM材料被用作覆盖层,以产生结构不对称性并增强界面效应。例如,Pt/Co/Ta结构吸引了很多关注,因为它可能表现出大的Dzyaloshinskiii-Moriya相互作用。然而,不同的盖帽材料的磁性能的依赖性还没有被系统地研究。在本文中,我们通过时间分辨的磁光克尔效应测量以及磁强计测量,实验显示的界面PMA和阻尼常数的Pt/Co/HM三层结构,其中盖HM材料是W,Ta,和Pd。我们发现Co/HM界面对磁性起着重要的作用。特别地,具有W覆盖层的磁性多层膜具有最低的有效阻尼值,这可能归因于Co和HM材料之间不同的自旋轨道耦合和界面杂化。我们的研究结果使我们对Pt/Co/HM三层结构有了更深入的了解。这样的结构可能会带来一个更好的数据存储和处理设备时代。

英文摘要:

Pt/Co/heavy metal (HM) tri-layered structures with interfacial perpendicular magnetic anisotropy (PMA) are currently under intensive research for several emerging spintronic effects, such as spinorbit torque, domain wall motion, and room temperature skyrmions. HM materials are used as capping layers to generate the structural asymmetry and enhance the interfacial effects. For instance, the Pt/Co/Ta structure attracts a lot of attention as it may exhibit large Dzyaloshinskii-Moriya interaction. However, the dependence of magnetic properties on different capping materials has not been systematically investigated. In this paper, we experimentally show the interfacial PMA and damping constant for Pt/Co/HM tri-layered structures through time-resolved magneto-optical Kerr effect measurements as well as magnetometry measurements, where the capping HM materials are W, Ta, and Pd. We found that the Co/HM interface plays an important role on the magnetic properties. In particular, the magnetic multilayers with a W capping layer features the lowest effective damping value, which may be attributed to the different spin-orbit coupling and interfacial hybridization between Co and HM materials. Our findings allow a deep understanding of the Pt/Co/HM tri-layered structures. Such structures could lead to a better era of data storage and processing devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑