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Ferrimagnets with a 'weak' magnetic sublattice

K. P. Belov

Lomonosov Moscow State University, Faculty of Physics

Abstract: Measurements on the anomalous temperature behaviour of the spontaneous magnetisation in various ferrimagnets (N-, M-, and P-type Neel curves) are analysed and summarised. The concept of a 'weak' magnetic sublattice is applied to explain the anomalies as well as manifestations of the 'low-temperature point' T_B and the antiferromagnetic-type paraprocess. The paraprocess phenomenon causes sign anomalies in the magnetocaloric effect, magnetostriction, and the 'first' component of the isotropic magnetoresistance. It is suggested that in magnetite (Fe₃O₄) the role of a 'weak' sublattice is played by the spin-ordered subsystem of hopping electrons ('magnetoelectron' sublattice), and the appearing point T_B is nothing else but the low-temperature transformation point T_t(100-120 K).

PACS: 63.90.+t, 75.25.+z, 75.40.-s, 75.50.Gg

Received: May 1, 1996

DOI: 10.3367/UFNr.0166.199606f.0669

 English version: Physics–Uspekhi, 1996, 39:6, 623–634

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