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 (all) DOI: 10.1070/PU1996v039n06ABEH000153 URL: https://ufn.ru/en/articles/1996/6/f/ A1996UZ88800006 Citation: Belov K P "Ferrimagnets with a 'weak' magnetic sublattice" Phys. Usp. 39 623–634 (1996) BibTexBibNote ® (generic)BibNote ® (RIS)MedlineRefWorks Оригинал: Белов К П «Ферримагнетики со „слабой“ магнитной подрешеткой» УФН 166 669–681 (1996); DOI: 10.3367/UFNr.0166.199606f.0669