Abstract
For an amorphous model system consisting of a random set of 100 identical hard sphere densely packed in a cube with periodical boundary conditions the energies of spiral magnetic structures are investigated. It is shown for a simple model with exponentially decaying antiferromagnetic interaction that a spiral structure may exist displaying a minimum energy. The wavevector of the spiral minimizing the interaction energy depends on the range of interaction: for the short range one the pitch of the spiral is twice as high as that for the longer range of interactions The calculated energies are compared with the interaction energies in s.c., f.c.c., and b.c.c. lattices. It is found that the energy gain in the topologically random system with respect to the magnetically disordered state may be higher than that corresponding to the antiferromagnetic arrangement in a crystal.
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One of the authors (S. K.) thanks Dr. J. L. Finney for a valuable discussion concerning the computer generation of the random set of hard spheres.
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Závěta, K., Kalva, Z., Veltruský, I. et al. Noncollinear magnetic structure in a random system of densely packed hard spheres. Czech J Phys 31, 917–926 (1981). https://doi.org/10.1007/BF01603788
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DOI: https://doi.org/10.1007/BF01603788