Weak disorder in a two-dimensional dipole magnet |
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Authors: | D É Fel’dman |
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Institution: | (1) Landau Institute of Theoretical Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russia |
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Abstract: | The effect of “random-field” disorder and “random-anisotropy-axis” disorder on a two-dimensional dipole ferromagnet is investigated.
It is shown that disorder results in instability of the ferromagnetic phase. The correlation function of the magnetization
is calculated with the aid of a self-consistent harmonic approximation. It is found that in the presence of a random field
the correlation function is a power-law function of the distance. In the presence of random anisotropy the correlation function
decreases logarithmically slowly as a function of distance.
Pis’ma Zh. éksp. Teor. Fiz. 65, No. 1, 108–112 (10 January 1997) |
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