Monte Carlo Simulations of Thermal Hysteresis in Ni-Mn-Based Heusler Alloys

2017 ◽  
Vol 255 (2) ◽  
pp. 1700265 ◽  
Author(s):  
Vladimir Sokolovskiy ◽  
Mikhail Zagrebin ◽  
Vasiliy Buchelnikov ◽  
Peter Entel
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Thermal Hysteresis ◽  
Heusler Alloys

Theoretical Study of Twin Boundary Motion in Heusler Ni-Mn-Ga Alloys Using Monte Carlo Method

2012 ◽  
Vol 190 ◽  
pp. 327-330
Author(s):  
K.I. Kostromitin ◽  
Vasiliy D. Buchelnikov ◽  
V.V. Sokolovskiy ◽  
P. Entel
Keyword(s):  
Magnetic Field ◽  
Monte Carlo ◽  
Monte Carlo Method ◽  
Monte Carlo Simulations ◽  
Twin Boundary ◽  
Constant Temperature ◽  
Theoretical Study ◽  
Heusler Alloys ◽  
Boundary Motion ◽  
Different Temperatures

The twin boundary motion in Ni-Mn-Ga Heusler alloys has been investigated using Monte Carlo simulations. The Hamiltonian of system includes magnetic and elastic parts and two magnetoelastic terms. It is shown that the twin boundary shifts in a magnetic field at the constant temperature. The spin and strain volume fractions have been obtained at different temperatures.

scholarly journals Monte-Carlo simulations of spin-crossover phenomena based on a vibronic Ising-like model with realistic parameters

2015 ◽  
Vol 17 (10) ◽  
pp. 6801-6808 ◽  
Author(s):  
Hong-Zhou Ye ◽  
Chong Sun ◽  
Hong Jiang
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Intermolecular Interactions ◽  
Spin Crossover ◽  
Thermal Hysteresis

A new vibronic Ising-like model considering harmonic stretching-and-bending intermolecular interactions with realistic parameters describes thermal hysteresis in spin-crossover phenomena well.

Athermal Martensites, Temperature-Time-Transformation Diagrams and Thermal Hysteresis: Monte Carlo Simulations of Strain Pseudospins

2012 ◽  
Vol 185 ◽  
pp. 31-33 ◽  
Author(s):  
N Shankaraiah ◽  
K.P.N. Murthy ◽  
Turab Lookman ◽  
S.R. Shenoy
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Domain Walls ◽  
Thermal Hysteresis ◽  
Temperature Cycling ◽  
Hysteretic Behavior ◽  
Model Hamiltonian ◽  
Long Range Interactions ◽  
Transformation Diagrams ◽  
Kinetics Of

We explore the kinetics of a three-state strain pseudospin model for a square/rectangle ferroelastic transition, described by a temperature dependent hamiltonian without quenched disorder, using temperature quench Monte Carlo simulations. The model hamiltonian includes power law anisotropic long range interactions, which lock the domain walls in a symmetry breaking diagonal direction. In athermal parameter regime, there are fast conversions at the athermal transition temperature, but with delay tails above it, as in experiment. The conversion delay tails have a Vogel-Fulcher divergence at transition to austenite. The incubation delays and their insensitivity to elastic energy scales are attributed to entropy barriers. Temperature cycling shows hysteretic behavior in physical quantities.

Monte Carlo simulations of the magnetocaloric effect in magnetic Ni–Mn–X(X= Ga, In) Heusler alloys

2011 ◽  
Vol 44 (6) ◽  
pp. 064012 ◽  
Author(s):  
V D Buchelnikov ◽  
V V Sokolovskiy ◽  
S V Taskaev ◽  
V V Khovaylo ◽  
A A Aliev ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Magnetocaloric Effect ◽  
Heusler Alloys

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.

Low-voltage EDS of magnesium ferrite Dendrites in a FEG-SEM

1996 ◽  
Vol 54 ◽  
pp. 478-479
Author(s):  
Matthew T. Johnson ◽  
Ian M. Anderson ◽  
Jim Bentley ◽  
C. Barry Carter
Keyword(s):  
Monte Carlo ◽  
Quantitative Analysis ◽  
Monte Carlo Simulations ◽  
Cross Section ◽  
Spatial Resolution ◽  
Low Voltage ◽  
Magnesium Ferrite ◽  
X Ray ◽  
Interaction Volume ◽  
Ferrite Spinel

Energy-dispersive X-ray spectrometry (EDS) performed at low (≤ 5 kV) accelerating voltages in the SEM has the potential for providing quantitative microanalytical information with a spatial resolution of ∼100 nm. In the present work, EDS analyses were performed on magnesium ferrite spinel [(MgxFe1−x)Fe2O4] dendrites embedded in a MgO matrix, as shown in Fig. 1. spatial resolution of X-ray microanalysis at conventional accelerating voltages is insufficient for the quantitative analysis of these dendrites, which have widths of the order of a few hundred nanometers, without deconvolution of contributions from the MgO matrix. However, Monte Carlo simulations indicate that the interaction volume for MgFe2O4 is ∼150 nm at 3 kV accelerating voltage and therefore sufficient to analyze the dendrites without matrix contributions.Single-crystal {001}-oriented MgO was reacted with hematite (Fe2O3) powder for 6 h at 1450°C in air and furnace cooled. The specimen was then cleaved to expose a clean cross-section suitable for microanalysis.

MONTE CARLO SIMULATIONS OF ELECTRON DRIFT VELOCITIES IN THE NOBLE GASES AND THEIR MIXTURES

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-63-C7-64
Author(s):  
A. J. Davies ◽  
J. Dutton ◽  
C. J. Evans ◽  
A. Goodings ◽  
P.K. Stewart
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Noble Gases ◽  
Electron Drift
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