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Title: Interfacial triferroicity in monolayer chromium dihalide

Journal Article · · Physical Review. B
ORCiD logo [1];  [2]; ORCiD logo [2];  [3]
  1. Huazhong University of Science and Technology, Wuhan (China); OSTI
  2. Huazhong University of Science and Technology, Wuhan (China)
  3. Virginia Commonwealth University, Richmond, VA (United States)

Couplings between different ferroics in two-dimensional (2D) materials, with atomic thickness and van der Waals surface, have been long sought but not yet realized. We show the first-principles evidence of unique triferroic couplings in recently synthesized CrI2 monolayer. Its ferroelasticity with a low switching barrier stems from the Jahn-Teller effect. When coupled with the interaction of a substrate, a type of interfacial ferroelectricity with direction determined by the ferroelastic states can emerge which can be switched following the same low-barrier pathway of ferroelastic switching. The direction of its striped antiferromagnetism is also governed by its ferroelastic states, leading to a coupling of ferroelasticity, ferroelectricity, and magnetism. Such mechanism of multiferroic couplings, denoted as interfacial Jahn-Teller triferroicity, can be applied to other 2D materials such as CuCl2 and their Janus monolayers, enabling electrical manipulation of spintronics for efficient nonvolatile random-access memories.

Research Organization:
Virginia Commonwealth University, Richmond, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Natural Science Foundation of China
Grant/Contract Number:
FG02-96ER45579
OSTI ID:
1979726
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 9 Vol. 105; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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