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The Coercivity of Hard Ferrite Single Crystals
Author(s) -
Jahn L.,
Müller H. G.
Publication year - 1969
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.19690350222
Subject(s) - coercivity , ferrite (magnet) , materials science , nucleation , single crystal , grain size , beta ferrite , nuclear magnetic resonance , condensed matter physics , metallurgy , composite material , microstructure , thermodynamics , physics , austenite
Magnetic properties of Sr‐, Ba‐ and Sr‐Ba‐ferrite single crystals are reported. From torque measurements results: Sr‐ferrite: M s = (380 ± 20) G, K 1 = (3.5 ± 0.1) × 10 6 erg cm −3 ; Ba‐ferrite: M s = (380 ± 20) G, K 1 = (3.2 ± 0.1) × 10 6 erg cm −3 . A large difference was found by a comparison of H ci, theor (coherent rotation) with H ci, meas (oriented Sr‐ferrite magnet). The very small (generally even positive) nucleation fields, measured on single crystal plates of different chemical composition and different crystal sizes can qualitatively explain the low values and the grain size dependence of H ci .