Geodesic
Stability of the antiferromagnetic state of finite spin chains
Teoretičeskaâ i matematičeskaâ fizika, Tome 115 (1998) no. 2, pp. 275-279

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The magnetic field strength at which the antiferromagnetic ordering becomes unstable is found analytically for a model of a one-dimensional ferromagnet with classical spin and anisotropic interaction. Such instabilities are inherent for the surface spin-flop transition, which is actively studied in hyperlattices 
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     author = {A. S. Zhedanov and A. N. Maluk},
     title = {Stability of the antiferromagnetic state of finite spin chains},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     year = {1998},
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A. S. Zhedanov; A. N. Maluk. Stability of the antiferromagnetic state of finite spin chains. Teoretičeskaâ i matematičeskaâ fizika, Tome 115 (1998) no. 2, pp. 275-279. http://geodesic.mathdoc.fr/item/TMF_1998_115_2_a8/