Dynamic hysteresis from zigzag domain walls: Discrete model and Monte Carlo simulations

Benedetta Cerruti; Stefano Zapperi

doi:10.1103/physrevb.75.064416

Dynamic hysteresis from zigzag domain walls: Discrete model and Monte Carlo simulations

Physical Review B ◽

10.1103/physrevb.75.064416 ◽

2007 ◽

Vol 75 (6) ◽

Cited By ~ 24

Author(s):

Benedetta Cerruti ◽

Stefano Zapperi

Keyword(s):

Monte Carlo ◽

Monte Carlo Simulations ◽

Discrete Model ◽

Domain Walls ◽

Dynamic Hysteresis

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

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.185.31 ◽

2012 ◽

Vol 185 ◽

pp. 31-33 ◽

Cited By ~ 1

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.

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

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100164854 ◽

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.

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