[T16] Magnetic Materials

[15P-T16-03] Relationship between Crystal Structure and Magnetostrictive Properties of Cu_0.8Co_0.2Fe₂O₄

*M. Hisamatsu¹, S. Kosugi¹, S. Seino¹, T. Nakagawa¹, S. Fujieda² (1.Graduate School of Engineering, Osaka University, Japan, 2.Institute for Advanced Materials Research and Development, Shimane University, Japan)

Keywords:magnetostriction, magnetostrictive materials, ferrites, Cobalt ferrite, Jahn-Teller effect

The relationship between crystal structure and magnetostrictive properties of Cu0.8Co0.2Fe2O4 was investigated. Although the as-synthesized Cu0.8Co0.2Fe2O4 sample showed a tetragonal spinel structure, a cubic spinel structure was obtained by heating at 1033 K and subsequent quenching. The as-synthesized sample was strained moderately by the application of magnetic fields. The magnetic field dependence of strain magnitude showed moderate changes without a saturation below 2.4 T. On the other hand, the sample quenched from 1033 K strained more sensitively by the application of magnetic fields in comparison with the as-synthesized sample and the magnitude of strain showed a maximum at approximately 0.2 T. Therefore, magnetostrictive properties of Cu0.8Co0.2Fe2O4 are strongly related to its crystal structure.