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Effect of sample shape and temperature on the ESR linewidth above the curie point of a ferromagnet
Author(s) -
Kötzler J.,
Scheithe W.
Publication year - 1975
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.2220690209
Subject(s) - curie temperature , condensed matter physics , ferromagnetism , field (mathematics) , demagnetizing field , magnetization , curie's law , relaxation (psychology) , laser linewidth , ellipsoid , physics , chemistry , materials science , magnetic field , curie–weiss law , quantum mechanics , mathematics , psychology , social psychology , laser , astronomy , pure mathematics
From room temperature down to temperatures near the Curie point ( T C = 2.21 K) the ESR linewidths of GdCl 3 ellipsoids narrow according to the simple law Δ H(T ) = Δ H (∞) × [1 – (θ(0) – CN z )/ T ], where N z denotes the demagnetization factor parallel to the applied static field. The result is explained by linearized modified Bloch equations, which describe the time development of the magnetization M (t ) under the influence of a molecular field and of relaxation forces driving M (t ) to a state of equilibrium determined by the instantaneous molecular field.
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