Open AccessTuning 2D magnetism in Fe3+XGeTe2 films by element doping
Author(s) -
Shanshan Liu,
Zihan Li,
Kè Yang,
Enze Zhang,
Awadhesh Narayan,
Xiaoqian Zhang,
Jianping Zhu,
Wenqing Liu,
Zhiming Liao,
Masaki Kudo,
Takaaki Toriyama,
Yunkun Yang,
Qiang Li,
Linfeng Ai,
Ce Huang,
Jiabao Sun,
Xiaojiao Guo,
Wenzhong Bao,
Qibo Deng,
Yanhui Chen,
Lifeng Yin,
Jian Shen,
Xiao Han,
Shuichi Matsumura,
Jin Zou,
Yongbing Xu,
Xiaodong Xu,
Hua Wu,
Faxian Xiu
Publication year - 2021
Publication title -
national science review/national science review
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.433
H-Index - 54
eISSN - 2095-5138
pISSN - 2053-714X
DOI - 10.1093/nsr/nwab117
Subject(s) - magnetism , materials science , ferromagnetism , curie temperature , molecular beam epitaxy , doping , condensed matter physics , fabrication , wafer , optoelectronics , phase (matter) , nanotechnology , epitaxy , chemistry , physics , medicine , alternative medicine , organic chemistry , layer (electronics) , pathology
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.