Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Structural and Magnetic Properties of Dilute Spinel Ferrites: Neutron Diffractometry and Magnetometry Investigations

  • Mamiya, H. (National Institute for Materials Science) ;
  • Terada, N. (National Institute for Materials Science) ;
  • Kitazawa, H. (National Institute for Materials Science) ;
  • Hoshikawa, A. (Ibaraki University) ;
  • Ishigaki, T. (Ibaraki University)
  • Received : 2011.01.25
  • Accepted : 2011.04.12
  • Published : 2011.06.30
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Abstract

Magnetic properties of highly zinc-substituted manganese ferrites are discussed on the basis of cation distribution. High throughput neutron powder diffractometry indicates that the prepared samples possess a nearly normal spinel structure, where the substitution of nonmagnetic zinc ions mainly causes the dilution of magnetic ions in the A-sublattice and consequently affects bond-randomness in the B-sublattice. On the other hand, the estimated occupancy of manganese ions in the B site indicates that random anisotropy effects due to local Jahn-Teller distortions gradually weaken with the substitution. Bulk magnetometry indicates that the substitution smears the transition from a paramagnetic phase to a soft-magnetic phase. Furthermore, at lower temperatures, such a soft-magnetic phase is destabilized and a magnetic glassy state appears. These features of the magnetic properties of dilute spinel ferrites are discussed from the viewpoint of the above-mentioned various types of disorders.

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