Bloch-Ising phase transition in spin solitons |
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Authors: | E Magyari |
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Institution: | (1) Hilti Forschungszentrum, FL-9494 Schaan, Fürstentum Liechtenstein |
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Abstract: | Heisenberg spin chains with ferromagnetic nearest-neighbor coupling and an easy axis of magnetisation are considered in the classical limit. The critical ratioa
c between the anisotropy coefficient and the exchange integral for which the 180°-Blochtype soliton undergoes a phase transition to an Ising-type soliton is calculated by an exact analytical algorithm. For chains including 2N=4,6,8,... spins, one finds a sequencea
c (2N) which converges rapidly to the valuea
c()=2/3 (e.g.a
c (12)=0.66664) marking the phase transition from a Bloch- to an Ising-structure of the soliton in an infinite chain.Dedicated to Professor Harry Thomas on the occasion of his 60th birthday |
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