Magnetoelectric coupling and spin-canting in FeCr2O4 ferrimagnet

•Two mechanisms of magnetoelectric coupling are analysed.•The exlicit form of Dzyaloshinskii–Moriya interaction (DMI) in FeCr2O4 was derived.•New mechanism is suggested for the appearance of the noncollinear ordering of Fe and Cr spins in FeCr2O4. It caused by the joint action of the spin–orbit, Jah...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2021-11, Vol.537, p.168185, Article 168185
Main Authors: Vasin, K.V., Eremin, M.V.
Format: Article
Language:English
Subjects:
Chromium
Couplings
DM interaction
Electron spin
Ferrimagnets
Filing
Iron
Jahn-Teller effect
Magnetoelectric coupling
Quantum mechanics
Spin-canting
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Summary:•Two mechanisms of magnetoelectric coupling are analysed.•The exlicit form of Dzyaloshinskii–Moriya interaction (DMI) in FeCr2O4 was derived.•New mechanism is suggested for the appearance of the noncollinear ordering of Fe and Cr spins in FeCr2O4. It caused by the joint action of the spin–orbit, Jahn–Teller couplings and the isotropic superexchange interaction between Fe-Cr ions. Within the framework of the quantum mechanical approach, the microscopic theory for magnetoelectric coupling and spin-canting in the spin ordered FeCr2O4 is discussed. We describe two possible mechanisms of magnetoelectric coupling caused by the combined action of the odd crystal field from the tetrahedral environment of the iron ions, the spin–orbit interaction and the exchange field acting on the 3d iron electrons from the chromium spins. We also consider sources of spin-canting. The first one is DM interaction which induces an angle-canting about 2°, the second is a new one due to the common action of the Jahn–Teller and spin–orbit couplings, which yields up to the 50°.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2021.168185