Layer and doping tunable ferromagnetic order in two-dimensional CrS2 layers

2017/06/30 by Cong Wang, Xieyu Zhou, Yuhao Pan +5 · 148 citations
Chemistry · Materials Science · Physics and Astronomy · #2D Materials and Applications #Antiferromagnetism #Band gap #Charge (physics) #Chemistry #Condensed matter physics #Coupling (piping) #Crystallography #Doping #Ferromagnetism #Iron-based superconductors research #Magnetic semiconductor #Materials science #Multiferroics and related materials #Nuclear magnetic resonance #Optoelectronics #Order (exchange) #Physics #Quantum mechanics #Semiconductor #Stacking #cond-mat.mes-hall #cond-mat.mtrl-sci

paper · pdf · doi:10.1103/physrevb.97.245409

published in Physical review. B./Physical review. B 97(24) (American Physical Society)

openalex created_date 2017/07/14 · openalex publication_date 2018/06/12 · arxiv created 2018/06/18 · arxiv updated 2018/06/20 · openalex updated_date 2026/08/05

Abstract

Interlayer coupling is of vital importance for manipulating physical properties, e.g., electronic band gap, in two-dimensional materials. However, tuning magnetic properties in these materials is yet to be addressed. Here, we found the in-plane magnetic orders of CrS₂ mono and few layers are tunable between striped antiferromagnetic (sAFM) and ferromagnetic (FM) orders by manipulating charge transfer between Cr t_2g and e_g orbitals. Such charge transfer is realizable through interlayer coupling, direct charge doping, or substituting S with Cl atoms. In particular, the transferred charge effectively reduces a portion of Cr⁴⁺ to Cr³⁺, which, together with delocalized S p orbitals and their resulting direct S-S interlayer hopping, enhances the double-exchange mechanism favoring the FM rather than sAFM order. An exceptional interlayer spin-exchange parameter was revealed over \ensuremath-10\phantom\rule0.16em0exmeV, an order of magnitude stronger than available results of interlayer magnetic coupling. It addition, the charge doping could tune CrS₂ between p- and n-doped magnetic semiconductors. Given these results, several prototype devices were proposed for manipulating magnetic orders using external electric fields or mechanical motion. These results manifest the role of interlayer coupling in modifying magnetic properties of layered materials and shed considerable light on manipulating magnetism in these materials.

Citations

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