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Dynamics of two‐spin cluster in spin glass III. Magnetization process at finite, but low temperature
Author(s) -
Heber G.,
Zymierska D.,
Beyer H.
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.2221140233
Subject(s) - magnetization , condensed matter physics , metastability , spin glass , cluster (spacecraft) , spin (aerodynamics) , phase diagram , physics , hysteresis , excitation , spin wave , magnetic field , phase (matter) , ferromagnetism , quantum mechanics , thermodynamics , computer science , programming language
Based on the two‐spin cluster model of spin glass, the magnetization process at low T is investigated. The short‐range inter‐cluster interaction is taken into account by excitation waves, treated as free Bosons. They feel, however, additionally a Weiß‐type molecular field of long range. For certain parameter sets in the range T < T F magnetic instabilities are found, as well as metastable branches of m ( H , T )‐curves, leading to magnetization jumps, induced by external magnetic field. The phase diagram shows a line of first‐order transitions and a point of a higher‐order transition. Hysteresis and domain patterns are the usual behaviour in this region.