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Magnetic After‐Effects in Single‐ and Poly‐Crystalline Magnetite
Author(s) -
Walz F.,
Brabers V. A. M.,
Chikazumi S.,
Kronmüller H.,
Rigo M. O.
Publication year - 1982
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.2221100212
Subject(s) - stoichiometry , magnetic relaxation , magnetite , ionic bonding , vacancy defect , relaxation (psychology) , materials science , atmospheric temperature range , spectral line , doping , crystallography , chemistry , analytical chemistry (journal) , ion , magnetization , magnetic field , thermodynamics , physics , social psychology , psychology , optoelectronics , organic chemistry , chromatography , quantum mechanics , astronomy , metallurgy
The magnetic relaxation spectra of different types of single crystalline magnetite are investigated in the temperature range 4 K < T < 450 K and compared with corresponding spectra obtained on stoichiometric (Fe 3 O 4 ) and vacancy‐doped polycrystals (Fe 3−Δ O 4 ). Three basic relaxation mechanisms are revealed within the following temperature ranges 4 K < T I < 35 K, 40 K < < T II < 130 K and 200 K < T III < 450 K, which may be associated to either electronic ( T I , T II ) or ionic ( T III ) hopping processes. In crystals with systematically reduced stoichiometry characteristic modifications in the structure of these spectra are observed from which additional information for a theoretical understanding may be obtained.