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Dynamics of Two‐Spin Cluster in Spin Glass II. The Magnetization Process at T = 0
Author(s) -
Nara S.,
Heber G.
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.2221090216
Subject(s) - magnetization , spins , condensed matter physics , spin glass , spin (aerodynamics) , cluster (spacecraft) , field (mathematics) , physics , magnetization dynamics , hysteresis , molecular dynamics , spin model , heisenberg model , magnetic field , ferromagnetism , quantum mechanics , thermodynamics , mathematics , computer science , programming language , pure mathematics
Based on the simple two‐spin cluster model of spin glass, the magnetization process at T = 0 is investigated. An ensemble of clusters is considered consisting of two Heisenberg spins in the external field and two kinds of molecular field which are called “homogeneous molecular field” and “inhomogeneous molecular field” created by inter‐cluster interactions. The spin quantum number is taken as S 1 = S 2 = 1/2 for conveniency. It is shown that this model qualitatively can well describe the S‐shape like magnetization process and hysteresis loops of several substances which are measured at very low temperature ( T ⩽ T f ). Also special cases are found of unstable magnetization changes which in reality will be smeared out.