Abnormal low-field M-type magnetoresistance in hexagonal noncollinear ferromagnetic MnFeGe alloy  

作　　者：Jia-Xuan Tang Pei-Hao Wang Yu-Rong You Ya-Dong Wang Zhan Xu Zhi-Peng Hou Hong-Guo Zhang Gui-Zhou Xu Feng Xu 

机构地区：[1]MIIT Key Laboratory of Advanced Metallic and Internetallic Materials Technology,School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing,210094,China [2]Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials,South China Academy of Advanced Optoelectronics,South China Normal University,Guangzhou,510006,China [3]Faculty of Materials and Manufacturing,Key Laboratory of Advanced Functional Materials,Ministry of Education of China,Beijing University of Technology,Beijing,100124,China

出　　处：《Rare Metals》2022年第8期2680-2687,共8页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos.11604148 and 51771003)

摘　　要：The new magnetic degree of freedom provided by the noncollinear structure plays an important role in the development of spintronic devices.In this work,we conducted a systematic study on the magnetic and electrical transport properties of the hexagonal noncollinear ferromagnetic MnFeGe alloy.Abnormal Hall effect and moderate magnetoresistance(MR)were observed below the Curie temperature(~200 K)of MnFeGe,in both bulk and thin-film forms.Notably,the perpendicular MR in all samples firstly grows,then quasi-linearly descends with magnetic field increasing,making an irregular M-type MR in the low-field region.It is speculated that the abnormal MR is related to the magnetic domain change,and combined with micromagnetic simulations,the labyrinth domain and sparse bubble formation are verified to exist in MnFeGe.Our work offers an understanding of the lowfield-positive MR in a ferromagnet,as well as raises the possibility of magnetic bubble formation in this noncollinear system.

关 键 词：M-type magnetoresistance Noncollinear MnFeGe Skyrmionic bubbles 

分 类 号：TG132.27[一般工业技术—材料科学与工程]