scholarly journals Monte Carlo study of magnetocaloric properties of Ni-Mn-Ga Heusler alloys

2010 ◽  
Vol 200 (3) ◽  
pp. 032008 ◽  
Author(s):  
V Buchelnikov ◽  
V Sokolovskiy ◽  
S Taskaev ◽  
V Khovaylo ◽  
P Entel
Keyword(s):  
Monte Carlo ◽  
Heusler Alloys ◽  
Monte Carlo Study ◽  
Magnetocaloric Properties

Monte Carlo Study of Magnetostructural Phase Transitions in Ni50Mn25+xSb25-x Heusler Alloys

2009 ◽  
Vol 154 ◽  
pp. 139-144 ◽  
Author(s):  
V.V. Sokolovskiy ◽  
Vasiliy D. Buchelnikov ◽  
Sergey Taskaev
Keyword(s):  
Monte Carlo ◽  
Phase Transitions ◽  
Monte Carlo Simulations ◽  
Magnetic Phase ◽  
Heusler Alloys ◽  
Monte Carlo Study ◽  
Magnetic Phase Transitions ◽  
Antiferromagnetic Exchange ◽  
Magnetization Curves ◽  
Model Hamiltonian

On the basis of Monte Carlo simulations, we investigate the temperature dependence of magnetization of Ni-Mn-Sb Heusler alloys, in which the part of the Mn atoms interact antiferromagnetically. It is shown that this antiferromagnetic exchange is responsible for existence of several magnetic phase transitions in the Heusler alloys. For a certain set of parameters of the model Hamiltonian we obtain coupled martensitic and magnetic phase transitions. Results of simulations agree in an excellent way with the experimental magnetization curves.

Monte Carlo Study of the Magnetic and Magnetocaloric Properties of La1-xCaxMnO3 (x = 0.33 and 0.5)

2012 ◽  
Vol 190 ◽  
pp. 347-350 ◽  
Author(s):  
O.O. Pavlukhina ◽  
Vasiliy D. Buchelnikov ◽  
V.V. Sokolovskiy ◽  
M.A. Zagrebin
Keyword(s):  
Monte Carlo ◽  
Calcium Ions ◽  
Monte Carlo Study ◽  
Cubic Lattice ◽  
Simple Cubic ◽  
Simple Cubic Lattice ◽  
Magnetocaloric Properties ◽  
Magnetic Ions ◽  
Curie Temperatures ◽  
Good Agreement

In our work the temperature dependencies of magnetization, entropy changes, and the Curie temperature (TC) of La1-xCaxMnO3 (x = 0.33 and 0.5) were investigated using Monte Carlo method and Heisenberg model. In our simulation, magnetic Mn3+ and Mn4+ ions are described by classical Heisenberg spins, while oxygen, lanthanum and calcium ions are considered as non-magnetic. The Mn magnetic ions are distributed on a simple cubic lattice according to the perovskite structure of the manganite. The theoretical Curie temperatures and magnetocaloric values are in a good agreement well with experimental data.

Study of Magnetocaloric Properties of Ni-Mn-X (X = Ga, In) Heusler Alloys by Monte Carlo Technique

2009 ◽  
Vol 1200 ◽  
Author(s):  
Vasiliy Buchelnikov ◽  
Vladimir Sokolovskiy ◽  
Sergey Taskaev ◽  
Peter Entel
Keyword(s):  
Experimental Data ◽  
Phase Transition ◽  
Monte Carlo ◽  
Magnetic Entropy Change ◽  
Heusler Alloys ◽  
Entropy Change ◽  
Magnetic Contribution ◽  
Magnetic Entropy ◽  
First Order ◽  
Magnetocaloric Properties

AbstractTwo theoretical Monte Carlo models have been presented for description of the positive and negative magnetocaloric effects of Heusler Ni-Mn-X (X = Ga, In) alloys undergoing first order coupled magnetostructural phase transition. For both models all quantities such as temperature dependence of the magnetic contribution to the total specific heat, magnetization and isothermal magnetic entropy change are in qualitative agreement with the available experimental data.

First-principles and Monte Carlo study of magnetostructural transition and magnetocaloric properties ofNi2+xMn1−xGa

2010 ◽  
Vol 81 (9) ◽  
Author(s):  
V. D. Buchelnikov ◽  
V. V. Sokolovskiy ◽  
H. C. Herper ◽  
H. Ebert ◽  
M. E. Gruner ◽  
...  
Keyword(s):  
Monte Carlo ◽  
First Principles ◽  
Monte Carlo Study ◽  
Magnetostructural Transition ◽  
Magnetocaloric Properties
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