1999•Journal of Physics D Applied PhysicsRequires access

Magnetization processes of small gamma-Fe2O3particles in non-magnetic matrix

V. Masheva, M. Grigorova, D. Nihtianova, Jens Ejbye Schmidt, M. Mikhov

Abstract

The magnetization processes of small ( 350 Å) and nearly spherical particles of -Fe 2 O 3 were studied at room temperature using the initial, hysteresis and remanence magnetization curves. The effective interparticle interactions were estimated for a number of virgin and alternating current demagnetized samples of -Fe 2 O 3 -SiO 2 mixtures with different magnetic phase concentrations. A non-monotonous dependence of the interactions on the magnetic phase concentration was observed. It was related to the changes in the domain state of some of the particles from the single-domain to the multi-domain.

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Key concepts: Remanence, Magnetization, Single domain, Stoner–Wohlfarth model, Hysteresis, Condensed matter physics, Materials science, Magnetic domain