Tuning 2D magnetism in Fe3+XGeTe2 films by element doping

DOI: 10.1093/nsr/nwab117

Authors: Shanshan Liu (Fudan University) , Zihan Li (Fudan University) , Ke Yang (Fudan University) , Enze Zhang (Fudan University) , Awadhesh Narayan (Indian Institute of Science) , Xiaoqian Zhang (Nanjing University) , Jiayi Zhu (University of Washington) , Wenqing Liu (Royal Holloway University of London) , Zhiming Liao (The University of Queensland; Beijing University of Technology) , Masaki Kudo (Kyushu University) , Takaaki Toriyama (Kyushu University) , Yunkun Yang (Fudan University) , Qiang Li (Fudan University) , Linfeng Ai (Fudan University) , Ce Huang (Fudan University) , Jiabao Sun (Royal Holloway University of London) , Xiaojiao Guo (Fudan University) , Wenzhong Bao (Fudan University) , Qingsong Deng (Beijing University of Technology) , Yanhui Chen (Beijing University of Technology) , Lifeng Yin (Fudan University) , Jian Shen (Fudan University; Collaborative Innovation Center of Advanced Microstructures, Nanjing) , Xiaodong Han (Beijing University of Technology) , Syo Matsumura (Kyushu University) , Jin Zou (The University of Queensland) , Yongbing Xu (Nanjing University) , Xiaodong Xu (University of Washington) , Hua Wu (Fudan University; Collaborative Innovation Center of Advanced Microstructures, Nanjing) , Faxian Xiu (Fudan University; Collaborative Innovation Center of Advanced Microstructures, Nanjing; Shanghai Research Center for Quantum Sciences)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: National Science Review

State: Published (Approved)
Published: July 2021
Diamond Proposal Number(s): 20748

Abstract: Two-dimensional (2D) ferromagnetic materials have been discovered with tunable magnetism and orbital-driven nodal-line features. Controlling the 2D magnetism in exfoliated nanoflakes via electric/magnetic fields enables the boosted Curie temperature (TC) or phase transitions. One of the challenges, however, is the realization of high TC 2D magnets that are tunable, robust and suitable for large scale fabrication. Here, we report molecular-beam epitaxy growth of wafer-scale Fe3+XGeTe2 films with TC above-room-temperature. By controlling the Fe composition in Fe3+XGeTe2, a continuously-modulated TC in a broad range of 185–320 K has been achieved. This widely tunable TC is attributed to the doped interlayer Fe that provide a 40% enhancement around the optimal composition X = 2. We further fabricated magnetic tunneling junction device arrays that exhibit clear tunneling signals. Our results show an effective and reliable approach, i.e. element doping, to produce robust and tunable ferromagnetism beyond room temperature in a large-scale 2D Fe3+XGeTe2 fashion.

Journal Keywords: 2D ferromagnetic material; Fe3+XGeTe2 film; element doping; above-room-temperature; TC tunability

Diamond Keywords: Ferromagnetism

Subject Areas: Materials, Physics


Instruments: I10-Beamline for Advanced Dichroism

Added On: 10/08/2021 08:17

Documents:
nwab117.pdf

Discipline Tags:

Surfaces Quantum Materials Hard condensed matter - electronic properties Physics Magnetism Materials Science interfaces and thin films

Technical Tags:

Spectroscopy Circular Dichroism (CD) X-ray Magnetic Circular Dichroism (XMCD)