垂直磁化NiCo_(2)O_(4)外延薄膜中的反常霍尔效应研究  

The anomalous Hall effect inperpendicular magneticanisotropy NiCo_(2)O_(4) epitaxial films

作　　者：王婷 王平 吴勇[3] 张鉴 张德林 姜勇 WANG Ting;WANG Ping;WU Yong;ZHANG Jian;ZHANG Delin;JIANG Yong(School of Materials Science and Engineering,Tiangong University,Tianjin 300387,China;Institute of Quantum Materials and Devices,School of Electronic and Information Engineering,Tiangong University,Tianjin 300387,China;School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China;School of Material and Environmental Engineering,Hangzhou Dianzi University,Hangzhou 310018;Cangzhou Institute of Tiangong University,Cangzhou 061000,China)

机构地区：[1]天津工业大学材料科学与工程学院,天津300387 [2]天津工业大学电子与信息工程学院量子材料与器件研究院,天津300387 [3]北京科技大学材料科学与工程学院,北京100083 [4]杭州电子科技大学材料与环境工程学院,杭州310018 [5]天津工业大学沧州市研究院,沧州061000

出　　处：《功能材料》2024年第11期11096-11100,11114,共6页Journal of Functional Materials

基　　金：国家重点研发计划(2022YFA1204003);国家自然科学基金面上项(52271240);河北省自然科学基金青年科学基金项目(E2023110012);天津工业大学沧州市研究院项目(TGCYY-F-0201)。

摘　　要：亚铁磁材料NiCo_(2)O_(4)具有高度可调的电荷、自旋、轨道、晶格和缺陷效应,其良好的室温垂直磁各向异性使其在自旋电子学器件中具有重要应用。研究采用磁控溅射法在MgAl 2O_(4)(001)衬底上制备了NiCo_(2)O_(4)薄膜,其具有平整的表面形貌和良好外延结构。12和16 nm的NiCo_(2)O_(4)薄膜均呈现良好的垂直磁各向异性,16 nm的NiCo_(2)O_(4)薄膜中还出现了非常规的电输运特性,从200 K开始,随温度上升,其反常霍尔效应曲线表现出多步磁矩翻转现象,这种变化是由于NiCo_(2)O_(4)中多个磁相的互相叠加。NiCo_(2)O_(4)优异的磁电特性及其高度可调性,为设计高性能自旋电子学器件提供了实验依据。The ferrimagnetic material NiCo_(2)O_(4) possesses excellent room-temperature perpendicular magnetic anisotropy,with highly adjustable charge,spin,orbital,lattice,and defect effects,making it crucial for applications in spintronics devices.In this work,the NiCo_(2)O_(4) films were prepared on MgAl 2O_(4)(001)substrates by using magnetron sputtering,which has a smooth surface and high-quality epitaxial structure.Both 12 nm and 16 nm NiCo_(2)O_(4) films exhibit excellent perpendicular magnetic anisotropy.In the 16 nm NiCo_(2)O_(4) film,unconventional electrical transport characteristics were observed.From^(2)00 K,the curves of anomalous Hall effect show a multi-step magnetization switching with increasing temperature.This variation is attributed to the mutual superposition of multiple magnetic phases in the NiCo_(2)O_(4).The outstanding magneto-electric properties of NiCo_(2)O_(4),along with its high adjustability,provide an experimental basis for designing spintronic devices.

关 键 词：亚铁磁NiCo_(2)O_(4) 外延薄膜 反常霍尔效应 磁电输运特性 

分 类 号：O484.1[理学—固体物理]