Mediating exchange bias by Verwey transition in CoO/Fe3O4 thin film

Abstract

We report the tunability of the exchange bias effect by the first-order metal-insulator transition (known as the Verwey transition) of Fe3O4 in CoO (5 nm)/Fe3O4 (40 nm)/MgO (001) thin film. In the vicinity of the Verwey transition, the exchange bias field is substantially enhanced because of a sharp increase in magnetocrystalline anisotropy constant from high-temperature cubic to lowtemperature monoclinic structure. Moreover, with respect to the Fe3O4 (40 nm)/MgO (001) thin film, the coercivity field of the CoO (5 nm)/Fe3O4 (40 nm)/MgO (001) bilayer is greatly increased for all the temperature range, which would be due to the coupling between Co spins and Fe spins across the interface.

References in corpus (6)

• Electric field control of exchange bias in multiferroic epitaxial heterostructures
• Conducting interfaces between band insulating oxides: the LaGaO3/SrTiO3
• Verwey transition in Fe${}_3$O${}_4$ thin films: Influence of oxygen stoichiometry and substrate-induced microstructure
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Cited by in corpus (2)

• Tuning interfacial spins in antiferromagnetic / ferromagnetic / heavy metal heterostructures via spin-orbit torque
• Controlling vertical magnetization shift by spin-orbit torque in ferromagnetic/antiferromagnetic/ferromagnetic heterostructure