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http://dx.doi.org/10.4283/JMAG.2011.16.2.134

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)

Publication Information

Journal of Magnetics / v.16, no.2, 2011 , pp. 134-139 More about this Journal

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.

Keywords

oxide spinel; TOF neutron diffraction; diluted ferrimagnet; smeared phase transition; reentrant spin-glass;

Citations & Related Records

Times Cited By Web Of Science : 2 (Related Records In Web of Science)
Times Cited By SCOPUS : 2

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