A Distinct Spin Structure and Giant Baromagnetic Effect in MnNiGe Compounds with Fe-Doping

Feiran Shen; Houbo Zhou; Fengxia Hu; Jian-Tao Wang; Hui Wu; Qingzhen Huang; Jiazheng Hao; Zibing Yu; Yihong Gao; Yuan Lin; Yangxin Wang; Cheng Zhang; Zhuo Yin; Jing Wang; Sihao Deng; Jie Chen; Lunhua He; Tianjiao Liang; Ji-Rong Sun; Tongyun Zhao; Baogen Shen

doi:10.1021/jacs.1c02694

A Distinct Spin Structure and Giant Baromagnetic Effect in MnNiGe Compounds with Fe-Doping

J Am Chem Soc. 2021 May 12;143(18):6798-6804. doi: 10.1021/jacs.1c02694. Epub 2021 May 3.

Authors

Feiran Shen^{1

2}, Houbo Zhou^{1

2}, Fengxia Hu^{1

2

3}, Jian-Tao Wang^{1

2

3}, Hui Wu⁴, Qingzhen Huang⁴, Jiazheng Hao^{1

5}, Zibing Yu^{1

2}, Yihong Gao^{1

2}, Yuan Lin^{1

2}, Yangxin Wang^{1

5}, Cheng Zhang^{1

2}, Zhuo Yin^{1

2}, Jing Wang^{1

2

6}, Sihao Deng⁵, Jie Chen⁵, Lunhua He^{1

3

5}, Tianjiao Liang⁵, Ji-Rong Sun^{1

2

3}, Tongyun Zhao^{1

7}, Baogen Shen^{1

2

3

7}

Affiliations

¹ Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
² School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, China.
³ Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China.
⁴ NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States.
⁵ Spallation Neutron Source Science Center, Dongguan 523803, China.
⁶ Fujian Innovation Academy, Chinese Academy of Sciences, Fuzhou, Fujian 350108, China.
⁷ Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, Jiangxi 341000, China.

PMID: 33938744
DOI: 10.1021/jacs.1c02694

Abstract

Spin structure of a magnetic system results from the competition of various exchange couplings. Pressure-driven spin structure evolution, through altering interatomic distance, and hence, electronic structure produces baromagnetic effect (BME), which has potential applications in sensor/actuator field. Here, we report a new spin structure(CyS-AFM^b) with antiferromagnetic(AFM) nature in Fe-doped Mn_0.87Fe_0.13NiGe. Neutron powder diffraction (NPD) under in situ hydrostatic pressure and magnetic field was conducted to reveal the spin configuration and its instabilities. We discovered that a pressure higher than 4 kbar can induce abnormal change of Mn(Fe)-Mn(Fe) distances and transform the CyS-AFM^b into a conical spiral ferromagnetic(FM) configuration(45°-CoS-FM^a) with easily magnetized but shortened magnetic moment by as much as 22%. The observed BME far exceeds previous reports. Our first-principles calculations provide theoretical supports for the enhanced BME. The compressed lattice by pressure favors the 45°-CoS-FM^a and significantly broadened 3d bandwidth of Mn(Fe) atoms, which leads to the shortened magnetic moment and evolution of spin structure.