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The Irreversibility and Viscosity Effects in Dilute Ferrimagnets
Author(s) -
Efimova N. N.,
Popkov Yu. A.,
Tkachenko N. V.
Publication year - 1989
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221540136
Subject(s) - ferrimagnetism , condensed matter physics , viscosity , superexchange , superparamagnetism , logarithm , ferromagnetism , materials science , magnetic field , spin glass , thermodynamics , chemistry , magnetization , physics , mathematics , quantum mechanics , mathematical analysis
An investigation is made of magnetic viscosity and irreversibility in systems with short‐range superexchange (dilute ferrimagnetic oxides), where these effects are directly to the nature of the spin glass (SG) state. It is found that the irreversibility effects may be attended by other characteristic features of the SG state (the magnetic viscosity, the dependence of the low temperature behaviour of σ ZFC ( T ) on the field H ), or alternatively, may exist without them, and are proper to various magnetic states: SG, superparamagnetic, as well as non‐collinear and disordered ferrimagnetic ones. In contrast, the existence of the logarithmic‐low magnetic viscosity is uniquely associated with the SG state.