The influence of oxidation process on exchange bias in egg-shaped FeO/Fe3O4 core/shell nanoparticles

• Synthesis of monodispersed FeO nanoparticles is shown.
• As-made FeO nanoparticle is antiferromagnetically ordered, when it is oxidized to Fe3O4, the FeO core becomes small and disordered.
• Exchange bias in well-ordered and disordered core is different.

Egg-shaped nanoparticles with a core–shell morphology were synthesized by thermal decomposition of an iron oleate complex. XRD and M(T) magnetic measurements confirmed the presence of FeO (wustite) and Fe3O4 (magnetite) phases in the nanoparticles. Oxidation of FeO to Fe3O4 was found to be the mechanism for the shell formation. As-made nanoparticles exhibited high values of exchange bias at 2 K. Oxidation led to decrease of exchange field from 2880 Oe (in as-made sample) to 330 Oe (in oxidized sample). At temperatures higher than the Néel temperature of FeO (200 K) there was no exchange bias. An interesting observation was made showing the exchange field to be higher than the coercive field at temperatures close to magnetite's Verwey transition.

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