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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 15: Multiferroics and Magnetoelectric Coupling (joint session MA/KFM)
KFM 15.3: Talk
Wednesday, March 20, 2024, 15:30–15:45, EB 407
Magnetoelectric Effects in 2D Magnets: A Multiscale Approach Applied to Topological Solitons in CrI3 — •Alexander Edström1, Paolo Barone2, Silvia Picozzi3, and Massimiliano Stengel4,5 — 1Department of Applied Physics, KTH Royal Institute of Technology, 10691 Stockholm, Sweden — 2CNR-SPIN, Area della Ricerca di Tor Vergata, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy — 3CNR-SPIN, c/o Università degli Studi ’G. D’Annunzio’, 66100, Chieti, Italy — 4ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Spain — 5ICREA , 08010 Barcelona, Spain
Topological defects, such as domain walls or Skyrmions, are expected to carry an electrical polarization, opening for the possibility to stabilize, control and detect them with electric fields, even in collinear ferromagnets like CrI3. Here, we present a multiscale approach, combining atomistic and continuum magnetoelectric models, to accurately describe magnetoelectric coupling at different length scales, with all parameters extracted from first principles. The models are validated for spin spirals, revealing a sizeable magnetoelectric polarization. We describe the relation of the magnetoelectric parameters to electric field-induced Dzyaloshinskii-Moriya interactions. The models are then used to calculate the electric polarization and net dipole moments of magnetic domain walls (DWs) and Skyrmions, revealing e.g. that Skyrmions carry an out-of-plane electric dipole moment, while that of anti-Skyrmions lies in the plane. Finally, we discuss the possibility to stabilize these magnetic textures, none of which are otherwise energetically stable in the monolayer limit of CrI3, using electric fields.
Keywords: Magnetoelectric; 2D magnetism; Skyrmions; Domain walls; Electric polarization