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Spin Waves in Amorphous Antiferromagnets
Author(s) -
Bogomaz I. V.,
Ignatchenko V. A.,
Iskhakov R. S.
Publication year - 1980
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.2220980110
Subject(s) - dispersion relation , condensed matter physics , spin wave , dispersion (optics) , physics , amorphous solid , white noise , lattice (music) , quantum mechanics , chemistry , mathematics , ferromagnetism , statistics , organic chemistry , acoustics
The modifications of the dispersion relation of the spin waves are calculated using two methods: the discrete method for the lattice model with exchange integral fluctuations in the form of δ‐correlated “white noise” and the phenomenological method for the continuous model with arbitrary correlation ranges of the fluctuations of the exchange parameters 1/ k 0 . A change in the character of the dispersion law ω( k ) occurs in the vicinity of the point k ≈ k 0 /2. The results which are obtained by these methods coincide in the long‐waves limit (at k <π/ a and k ≪ k 0 /2, respectively).