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Tailoring magnetism in spinel vanadate CoV2O4epitaxial thin films

Behera, BC and Sabat, G and Bhat, SG and Sarangi, SN and Sekhar, BR and Samal, D (2021) Tailoring magnetism in spinel vanadate CoV2O4epitaxial thin films. In: Journal of Physics Condensed Matter, 33 (36).

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Official URL: https://doi.org/10.1088/1361-648X/ac0e6f


Near itinerant cubic bulk CoV2O4 is at variance with other spinel vanadates by not showing orbital ordering down to low temperature, albeit it displays fragile anomalies related to spin, and lattice structure, signaling a spin/orbital glass transition around 95 K. We investigate tetragonal-like epitaxial CoV2O4 films on SrTiO3 and (La0.3Sr0.7)(Al0.65Ta0.35)O3 substrates that exhibit pronounced signature of spin reorientation transition from to a/b plane around 90 K unlike its bulk counterpart. Using in-plane and out-of-plane magnetic measurements, we demonstrate the intricate link between Co2+ and V3+ sublattice magnetizations that give rise to anisotropic magnetic switching. In-plane magnetic measurements reveal a wasp-waist shaped M(H) loop below reorientation transition temperature, while the out-of-plane follows antiferromagnet-like M(H) response. The wasp-waist shaped feature could be linked to in-plane spin-canted (anti)ferromagnetism induced by canting away of V-spins away from antiferromagnetically coupled Co-spin direction below reorientation transition temperature. Further, we uncover the evidence for slow relaxation over a period of �104 s at 20 K and memory effect that indicates the possible existence for magnetic glassy phase in the low temperature regime. Using epitaxial strain as a control knob, our results inspire future study to manipulate orbital states, spin texture and itinerant electron character in tailored CoV2O4 films away from cubic lattice symmetry. © 2021 IOP Publishing Ltd.

Item Type: Journal Article
Publication: Journal of Physics Condensed Matter
Publisher: IOP Publishing Ltd
Additional Information: The copyright for this article belongs to IOP Publishing Ltd
Keywords: Aluminum compounds; Cobalt compounds; Crystal lattices; Ferromagnetism; Glass; Glass transition; Lanthanum compounds; Magnetic variables measurement; Spin glass; Strontium titanates; Tantalum compounds; Temperature; Textures; Thin films; Titanium compounds, Antiferro-magnetically coupled; Itinerant electrons; Lattice structures; Low-temperature regime; Magnetic switching; Pronounced signatures; Spin reorientation transitions; Sublattice magnetization, Vanadium compounds
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 25 Sep 2021 12:38
Last Modified: 25 Sep 2021 12:38
URI: http://eprints.iisc.ac.in/id/eprint/69791

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