By use of Mössbauer spectroscopy we have followed the gradual alignment of the magnetization of γ-Fe 2 O 3 nanoparticles as a function of the applied field. At moderate fields, the magnetization was less aligned with the field if the particles were mixed with CoO nanoparticles. This indicates a strong exchange interaction between the γ-Fe 2 O 3 and the CoO nanoparticles. The effect manifests itself in a way which can be difficult to distinguish from localized spin canting.
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Frandsen et al. (2004) studied this question.
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