Magnetostriction effects of 3 d4 and 3 d6 ions in dilute magnetic oxide films

Gerald F. Dionne, Hyun Suk Kim

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Abstract

Magnetic ions of the 3 dn transition series in oxide lattices can introduce large local magnetostriction effects through spin-orbit-lattice interactions with an axially distorted cubic crystal field. In this paper, the local-site magnetostriction model used successfully in ferrites containing small concentrations of Jahn-Teller (JT) ions is applied to the case of magnetically dilute oxide films. Uniaxial anisotropy created by elastic lifting of the orbital Eg ground-state doublet degeneracy of 2% Cr2+ (3 d4) in an In2 O3 film is contrasted with the corresponding effects of a T2g triplet splitting of 5% Co3+ (3 d6) in a SiSi O2 film deposited under similar in-plane stress conditions. In these two situations, the signs of the magnetostrictive strains are reversed as predicted from theory and are consistent with local magnetoelastic effects of JT ions in undiluted ferrites. A phenomenological analysis of room-temperature magnetization data suggests a possible magnetostriction constant range of 0.02< λsite <0.2 for a single JT octahedral site.

Original languageEnglish
Article number07B333
JournalJournal of Applied Physics
Volume103
Issue number7
DOIs
StatePublished - 2008

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