Sr-doped BaFeO3 nanoparticles are synthesized using high-energy ball milling followed by solid-state reaction. The magnetic ground state of non-stoichiometric BaFeO3nanoparticles is different when compared with stoichiometric BaFeO3. The nature of magnetization curve against temperature is modified for the Sr-doped system and irreversibility in magnetization curves is observed in field-cooled (M FC) and zero field-cooled (M ZFC) curves. Susceptibility vs temperature follows the Curie–Weiss behaviour. The magnetization does not saturate even in 90-kOe field. The observed exchange bias is attributed to the existence of more than one magnetic order due to the mixed valence state of Fe. The magnetic order in Sr-doped BaFeO3 is found to change from helical antiferromagnet to an antiferromagnet.
Journal of Superconductivity and Novel Magnetism – Springer Journals
Published: Mar 30, 2017
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