Open AccessSPONTANEOUS MAGNETIZATION OF SMALL PARTICLE SPIN SYSTEM
Author(s) -
J. R. Sun,
SHEN ZHONG-YI,
Yong Liu,
Pu Fu-Ke
Publication year - 1993
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.42.134
Subject(s) - magnetization , spontaneous magnetization , condensed matter physics , particle (ecology) , spin (aerodynamics) , particle system , materials science , physics , magnetic field , quantum mechanics , computer science , thermodynamics , oceanography , geology , operating system
Based upon the spin wave theory, the spontaneous magnetization of small particle system at low temperatures is studied by means of solving the Heisenberg model directly. Investigations show that the spin waves are frozen out at ultra-low temperature, and the Bloch T3/2 law is no longer correct in any region of temperature. At the same time, the distribution of the probability for spins to be activated versus positions is obtained, which indicates that there exists no spin layers with obviously high probability to flip.