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Ising Model Simulation Of Magnetic Structures IN A Zn-Mg-Ho Structure Model

Published online by Cambridge University Press:  10 February 2011

S. Matsuo ,
T. Ishimasa  and
H. Nakano
S. Matsuo
Affiliation:
Department of Natural Science Informatics, School of Informatics and Sciences, Nagoya University, Chikusa-ku, Nagoya 464–8601, Japan
T. Ishimasa
Affiliation:
Department of Physical Science and Engineering, School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464–8603, Japan
H. Nakano
Affiliation:
Department of Physical Science and Engineering, School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464–8603, Japan
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Abstract

Simulated annealing calculations were performed for Ising spins on Ho sites under Ruderman-Kittel-Kasuya-Yosida-like alternating exchange interactions for an icosahedral Zn-Mg-Ho structure model with intent to investigate the magnetic structures at low temperatures. Magnetic structures were analyzed by means of a Patterson function and diffraction patterns arising from spin-dependent scattering amplitudes. The diffraction patterns from the magnetic structure consist of spots at low temperatures in the case of an antiferromagnetic interaction for the shortest distance (3.37 Å) and a ferromagnetic interaction for the second shortest distance (5.46 Å). The Patterson maps indicate a long-range antiferromagnetic correlation. These facts mean that a long-range ordered magnetic structure is realized at low temperatures. The contrast of the diffraction patterns is different from the patterns arising from the spin-independent scattering amplitudes from the Ho sites. A reversed sign interaction, ferromagnetic for the shortest distance and antiferromagnetic for the second shortest distance, results in broad intensity minima in the magnetic diffraction at the positions of strong spots in the spin-independent diffraction by lattice sites. It corresponds to the degradation of the long-range correlation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 553: Symposium LL – Quasicrystals , 1998 , 427
Copyright
Copyright © Materials Research Society 1999

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