journal article·2023-12-12

Above-Room-Temperature Strong Ferromagnetism in 2D MnB Nanosheet

Yong Wang, Wei Xu, Dingyi Yang, Yu Zhang, Yongjie Xu, Zixuan Cheng, Xuke Mi, Yizhang Wu, Yan Liu, Yue Hao, Gen-Quan Han

ACS Nano· Volume 17· Issue 23
Publisher page

Abstract

Two-dimensional (2D) room-temperature (RT) ferromagnetic materials have amassed considerable interest in the field of fundamental physics for applications in next-generation spintronic devices owing to their physical properties. However, realizing strong RT ferromagnetism and a high Curie temperature ( T C ) in these 2D magnetic materials remains challenging. Herein, we develop a 2D MnB nanosheet for known 2D ferromagnets that demonstrates strong RT ferromagnetism and a record-high above-RT T C of ∼585.9 K. Through magnetic force microscopy, clear evidence of ferromagnetic behavior is observed at room temperature. Structural characterization and density functional theory calculations further reveal that (i) after exfoliation of bulk, −OH functional groups were introduced in addition to Mn–B bonds being formed, which increases MnB nanosheet T C to 585.9 K and (ii) the d 3 ↑ spin configuration of Mn mainly contributed to the magnetic moment of MnB, and the hybridization between the d xz (d yz ) and d z 2 orbitals of the Mn atom provides a large contribution to magnetic anisotropy, which stabilizes the magnetic property of MnB. Our findings establish a strong experimental foundation for 2D MnB nanosheets as ideal materials for the construction of spintronic devices.
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Research context

OpenAlex topics: 2D Materials and Applications · MXene and MAX Phase Materials · ZnO doping and properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Microelectronics, Academy of Advanced Interdisciplinary Research, Xidian University, Xi’an 710071, People’s Republic of China

Hangzhou Institute of Technology, Xidian University, Hangzhou 311200, People’s Republic of China

National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures and Jiangsu Provincial Key Laboratory for Nanotechnology, Nanjing University, Nanjing 210093, People’s Republic of China

INRS Centre for Energy, Materials and Telecommunications, 1650 Boul. Lionel Boulet, Varennes, Québec J3X 1P7, Canada

Department of Physics, Shaanxi University of Science and Technology, Xi’an 710021, People’s Republic of China

School of Education, Jiangsu Open University, Nanjing 210036, People’s Republic of China

Department of Applied Physical Sciences, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27514, United States

Funding

National Key Research and Development Program of China · National Postdoctoral Program for Innovative Talents · Natural Science Basic Research Program of Shaanxi Province · Fundamental Research Funds for the Central Universities · National Natural Science Foundation of China · Natural Science Foundation of Zhejiang Province

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