scholarly journals Monte Carlo simulation of aging phenomena in multilayer magnetic structures

2018 ◽  
Vol 185 ◽  
pp. 03008
Author(s):  
Alexandr N. Purtov ◽  
Marina V. Mamonova ◽  
Vladimir V. Prudnikov ◽  
Pavel V. Prudnikov
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Aging Effects ◽  
Initial State ◽  
Magnetic Systems ◽  
Magnetic Structures ◽  
Slowing Down ◽  
Time Autocorrelation Function ◽  
Aging Phenomena ◽  
Ferromagnetic Ordering

A Monte Carlo simulation of the non-equilibrium behavior of multilayer magnetic structures consisting of alternating magnetic and nonmagnetic nanolayers is realized. The calculated two-time autocorrelation function for the structure during its evolution starting from high-temperature initial state is analyzed. The analysis reveals aging effects characterized by a slowing down of correlation characteristics in the system with increase of the waiting time. The dependence of aging characteristics on thickness of ferromagnetic films is investigated. It is shown that, in contrast to bulk magnetic systems, the aging effects in magnetic superstructures arise not only at the ferromagnetic ordering temperature Tc in the films but also within a wide temperature range at T ≤ Tc.

scholarly journals Monte Carlo simulation of magnetic systems in the Tsallis statistics

1999 ◽  
Vol 268 (3-4) ◽  
pp. 553-566 ◽  
Author(s):  
A.R. Lima ◽  
J.S.Sá Martins ◽  
T.J.P. Penna
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Magnetic Systems ◽  
Tsallis Statistics

Monte Carlo simulation of multilayer magnetic structures and calculation of the magnetoresistance coefficient

JETP Letters ◽  
2015 ◽  
Vol 102 (10) ◽  
pp. 668-673 ◽  
Author(s):  
V. V. Prudnikov ◽  
P. V. Prudnikov ◽  
D. E. Romanovskii
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Magnetic Structures

INFLUENCE OF INITIAL STATES ON TWO-TIME DEPENDENCE OF MAGNETORESISANCE IN MULTILAYER STRUCTURES WITH DIFFERENT TYPES OF ANISOTROPY

2020 ◽  
Vol 25 (2) ◽  
pp. 24-33
Author(s):  
Marina Mamonova ◽  
Vladimir Prudnikov ◽  
Pavel Prudnikov ◽  
Anna Samoshilova
Keyword(s):  
Monte Carlo ◽  
Time Dependence ◽  
Monte Carlo Study ◽  
Multilayer Structures ◽  
Aging Effects ◽  
Slow Dynamics ◽  
Magnetic Structures ◽  
Different Types ◽  
Initial States ◽  
Non Equilibrium

The Monte Carlo study of initial states influence on non-equilibrium slow dynamics and two-time dependence of magnetoresistance in multilayer magnetic structures Co/Cu(100)/Co и Pt/Co/Cu(100)/Co/Pt with different types of anisotropy is presented. It was revealed nontrivial aging effects in the magnetoresistance and essential influence of initial states on the magnetoresistance.

Effect of Ambient Pressure on the Generation and the Propagation of Plasmas Produced by Pulsed Laser Ablation of Metal Al in Air

1997 ◽  
Vol 51 (12) ◽  
pp. 1910-1915 ◽  
Author(s):  
B. Y. Man ◽  
X. T. Wang ◽  
G. T. Wang
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Ambient Pressure ◽  
Pulsed Laser ◽  
Emission Spectra ◽  
Pulsed Laser Ablation ◽  
Quantitative Information ◽  
Slowing Down ◽  
The Mean ◽  
Monte Carlo Simulation Program

Simultaneous time- and space-resolved emission spectra from a Nd: YAG laser-ablated plasma on an Al target have yielded quantitative information on the generation and the propagation of species in the plasma. Five ambient pressures from atmosphere to 5 Pa were chosen. The experimental results showed that the characteristics of the species in the plasma were strongly influenced by the ambient pressure. The mean spatially projected ranges of Al2+ ions in the atmosphere of different densities were calculated in theory, and the slowing-down processes were simulated by using a popular Monte Carlo simulation program, TRIM90. The calculated results can be used to explain observed experimental phenomena.

scholarly journals Study of the slowing down of high energy proton shots through metals via a Monte Carlo simulation of the Fokker-Planck equation

2005 ◽  
Vol 20 (2) ◽  
pp. 23-27
Author(s):  
Francesco Teodori ◽  
Vincenzo Molinari
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Planck Equation ◽  
High Energy ◽  
High Energy Proton ◽  
Slowing Down ◽  
Energy Proton ◽  
Fokker Planck Equation ◽  
Multi Body ◽  
Fokker Planck

The aim of this work is to analyze the diffusion and the slowing down of high energy proton shots through a target. Analyzing the phenomenon rigorously with the full transport equations, means tack ling many difficulties, most of which arise from the long range nature of the Coulomb interactions involving more than one particle simultaneously. The commonly used approach of neglecting the multi-body collisions, though correct for rarefied neutral gases, of ten leads to very poor approximations when charged particles moving through dense matter are considered. Here we present a Monte Carlo simulation of the Fokker-Planck equation where the multi-body collisions are taken into account. The model al lows the calculation of a point-wise distribution of energy and momentum transferred to the tar get.

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