磁控溅射制备的GdCo/Cu/Py异质结自旋-轨道矩铁磁共振研究  

The investigation of ST-FMR in GdCo/Cu/Py heterostructure prepared by magnetron sputtering

作　　者：朱增泰 曹翠梅 朱旭鹏 李佳楠 ZHU Zeng-tai;CAO Cui-mei;ZHU Xu-peng;LI Jia-nan(School of Physics Science and Technology,Lingnan Normal University,Zhanjiang 524000,China;Songshan Lake Materials Laboratory,Dongguan 523808,China;Key Laboratory of Polar Materials and Devices,School of Physics and Electronic Science,East China Normal University,Shanghai 200241,China)

机构地区：[1]岭南师范学院物理科学与技术学院,广东湛江524048 [2]松山湖材料实验室,广东东莞523808 [3]华东师范大学物理与电子科学学院,上海200241

出　　处：《磁性材料及器件》2024年第1期6-11,共6页Journal of Magnetic Materials and Devices

基　　金：广东省基础与应用基础研究基金资助项目(2020A1515110998,2022A1515012123)。

摘　　要：近年来,由稀土元素和3d过渡金属构成的亚铁磁材料受到广泛的关注。亚铁磁材料既具有同铁磁材料一样的净余磁矩,又有反铁磁材料的超快动力学特征,这些性质使其成为自旋电子学领域的研究热点之一。在本工作中,采用磁控溅射的方法制备了亚铁磁GdCo/Cu/Permalloy(Py)异质结,通过自旋-轨道铁磁共振(spin-orbit ferromagnetic resonance,ST-FMR)的方法研究了样品的磁化动力学和自旋传输特性,并分析了所制备样品的铁磁共振阻尼与自旋轨道矩效率。结果表明,所制备GdCo/Cu/Py异质结的自旋轨道矩(spin orbital torque,SOT)效率为−0.08,略低于重金属Pt的自旋霍尔角。同时铁磁共振阻尼分析也显示出GdCo/Cu/Py异质结中没有显著的自旋泵浦效应,导致这种现象的原因可能是界面处自旋传输的非互易性。研究证明亚铁磁GdCo薄膜不同于铁磁性材料的动态磁化特性,显示出其物理研究价值和实际应用潜力。Recently,ferrimagnetic materials composed of rare earth elements and 3d transition metals have received extensive attention.Ferrimagnetic materials have the adjustable net magnetization,as well as the antiferromagnetic-like ultrafast magnetic dynamic behavior,which make it become one of the popular research fields in spintronic.In this work,we prepared the ferrimagnetic GdCo/Cu/Permaloy(Py)heterostructure by magnetron sputtering system.The magnetic dynamic and spin transfer characters of the sample were studied by using the spin-orbit ferromagnetic resonance.The spin orbital torque efficiency of the prepared GdCo/Cu/Py heterstructure is−0.08,which is slightly lower than the spin Hall angle of heavy metal Pt.The damping analysis shows negligible spin pumping effect in the GdCo/Cu/Py heterstructure.We attribute this phenomenon to the non-reciprocity of spin transfer at the interface.Our work shows the unique magnetic dynamic properties of ferrimagnetic GdCo film,showing its practical application potential.

关 键 词：GdCo薄膜 磁控溅射 ST-FMR SOT效率 阻尼系数 

分 类 号：O469[理学—凝聚态物理]