The Effect of Nonmagnetic Impurities on Phase-Transition Kinetics and Correlation Effects in a Quasi-1D Ising Nanomagnetic

• Published in: Russian physics journal Vol. 55; no. 12; pp. 1478 - 1485
• Main Authors: Shabunina, E. V., Spirin, D. V., Popov, A. A., Udodov, V. N., Potekaev, A. I.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.05.2013; Springer
• Subjects: Analysis; Condensed Matter Physics; Ferromagnetism; Hadrons; Heavy Ions; Lasers; Mathematical and Computational Physics; Monte Carlo method; Nuclear Physics; Optical Devices; Optics; Photonics; Physics; Physics and Astronomy; Theoretical; metastable states; ferromagnetic; one-dimensional Ising model; critical exponents; relaxation time; phase transition kinetics; nanomagnetic
• ISSN: 1064-8887; 1573-9228
• DOI: 10.1007/s11182-013-9982-y

Using a Monte Carlo simulation, the effect of external field, temperature, system’s dimensions and interaction of non-nearest neighbors on the relaxation time and critical indices of an antiferromagnetic-to-ferromagnetic phase transition is investigated taking into account nonmagnetic impurities within a modified, onedimensional, nanosized Ising model. It is shown that the non-equilibrium processes taking place in the magnetic material could be classified as fast and slow, whose velocities differ by more than a thousand times. In the case of fast processes, metastable (including ferromagnetic) states (observed experimentally) are the first to form, while in the case of slow processes the system transits into a stable state. The behavior of the dynamic critical exponent ( z ) and static correlation-length critical exponent ( ν ) is revealed for the model of a 1D ferromagnetic for the case of arbitrary concentrations of nonmagnetic impurities.