Journal
PHYSICAL REVIEW B
Volume 89, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.104411
Keywords
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Funding
- LNLS, Campinas, Sao Paulo, Brazil [SGM 12490, PGM 12490]
- CONICET, Argentina [PIP 1111, PIP 0324]
- ANPCyT, Argentina [PICT 1399-2008]
- DFG [SFB762]
- MINCyT-DAAD [DA13/02]
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This work probes the relevance of oxygen vacancies in the formation of local ferromagnetic coupling between Fe ions at octahedral sites in zinc ferrites. This coupling gives rise to a ferrimagnetic ordering with the Curie temperatures above room temperature in an otherwise antiferromagnetic compound. This conclusion is based on experimental results from x-raymagnetic circular dichroismmeasurements at the Fe L-2,L-3 edges and magnetization measurements performed on zinc ferrites, nanoparticles, and films, with different cation distributions and oxygen vacancy concentrations. Our observations are confirmed by density-functional-theory calculations and indicate that the enhanced ferrimagnetic response observed in some nominally nonmagnetic or antiferromagnetic ferrites can be taken as a further example of the defect-induced magnetism phenomenon.
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