Magnetic After‐Effects in Single‐ and Poly‐Crystalline Magnetite | Zendy

Walz F. | Zendy; Brabers V. A. M. | Zendy; Chikazumi S. | Zendy; Kronmüller H. | Zendy; Rigo M. O. | Zendy

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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.

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