Toward 2D Magnets in the (MnBi2Te4)(Bi2Te3)n Bulk Crystal

• DOI: 10.1002/adma.202001815
• Publication Date: 2020-04-24T10:25:56Z
• Authors: Jiazhen Wu; Fucai Liu; Can Liu; Yong Wang; Changcun Li; Yangfan Lu; Satoru Matsuishi; Hideo Hosono
• Keywords: 0301 basic medicine; 0303 health sciences; 03 medical and health sciences; 02 engineering and technology; 0210 nano-technology; 01 natural sciences; 0104 chemical sciences

2D magnets and their engineered magnetic heterostructures are intriguing materials for both fundamental physics application prospects. On the basis of recently discovered intrinsic topological insulators (MnBi2 Te4 )(Bi2 Te3 )n , here, a new type magnet, in which layers separated by large number non-magnetic become magnetically independent, is proposed. This magnet named as single-layer regarding vanishing interlayer exchange coupling. Theoretical calculations magnetization measurements indicate that, decoupling starts to emerge from n = 2 3, revealed unique slow-relaxation behavior below ferromagnetic-type transition at Tc 12-14 K. Magnetization data analysis shows that proposed states have strong uniaxial anisotropy along c-axis, forming an Ising-type structure, where ordering temperature each layer. The characteristic slow relaxation, exists only c-axis but absent ab plane, can be ascribed coherent spin rotation and/or intralayer domain wall movement. present results will stimulate further theoretical experimental investigations prototypical structures, combination with surface may lead exotic physical properties.