Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2012
The magnetic properties (phase diagram and total magnetization) of a decorated Ising nanowire are examined by the use of the effective field theory with correlations. The system, consisting of spin-1/2 atoms and decorating spin-S (S>1/2) atoms with a crystal-field interaction on the bonds, show ferrimagnetism, compensation point and reentrant behavior. © 2012 Elsevier B.V. All rights reserved.
Kaneyoshi T.,Kurosawadai |
Kaneyoshi T.,Nagoya University
Journal of Magnetism and Magnetic Materials | Year: 2015
The phase diagram and magnetizations in two transverse Ising nanoislands with the same structures which are consisted of the two layers are examined by using the effective-field theory with correlations. The effects of interlayer coupling and two transverse fields at the center and the perimeter atoms on them are examined. We find remarkable features in them which come from the frustration induced by the interlayer coupling and two transverse fields. © 2014 Elsevier B.V.
Physica E: Low-Dimensional Systems and Nanostructures | Year: 2015
The phase diagrams and temperature dependences of magnetizations in cylindrical Ising nanowire and nanotube are studied by the uses of the effective-field theory with correlations (EFT) and the core-shell concept, where a negative exchange interaction is selected at the surface shell and two positive exchange interactions are taken in the core and between the core and the surface shell. Some unconventional features, such as the possibility of re-entrant phenomena being free from disorder induced frustration, are obtained for the magnetic properties in such systems. © 2015 Elsevier B.V. All rights reserved.
Physica A: Statistical Mechanics and its Applications | Year: 2012
The phase diagrams (transition temperature and compensation temperature) and magnetizations of a cylindrical nanowire with a (positive or negative) coreshell interaction and a surface dilution, described by the transverse Ising model (TIM), are investigated by the use of the effective-field theory with correlations. The magnetic properties of the system are strongly affected by the surface dilution. In particular, the temperature dependences of magnetizations in the system have shown many characteristic phenomena, depending on the selected physical parameters. © 2012 Elsevier B.V. All rights reserved.
Physica A: Statistical Mechanics and its Applications | Year: 2013
The phase diagrams and magnetizations of two nanosystems (nanotube and nanowire) with a dilution at the surface are investigated by the use of the effective field theory with correlations. In particular, the effects of interlayer coupling between the surface and the core on them are discussed for the two systems. Some interesting phenomena have been found in the phase diagrams and the thermal variations of magnetizations, especially for the nanotube with a very high dilution and the possibility of two compensation points in the nanowire with a small interlayer coupling. © 2013 Elsevier B.V. All rights reserved.