Thermodynamics of the 2-D Ising Model From a Random Path Sampling Method

authors	Amaral, JS; Goncalves, JN; Amaral, VS
nationality	International
journal	IEEE TRANSACTIONS ON MAGNETICS
author keywords	Ferromagnetism; Ising model; magnetic refrigeration; magnetocaloric effect; thermodynamics
keywords	MONTE-CARLO SIMULATIONS; DISORDER
abstract	We explore the thermodynamics of the 2-D Ising model from a random path sampling method. We show how convergence of free energy and magnetization is obtained in a number of sweeps orders of magnitude below the number of total configurations. The effects of external parameters, such as magnetic field (H) and temperature (T) are accounted in a computationally simple way, allowing very detailed (H, T)-dependent calculations. The effects of more complex interactions can also be considered, particularly magnetovolume coupling, which has proven to be difficult to tackle using traditional approaches. We show its effect on magnetic entropy change (magnetocaloric effect) in this microscopic scenario. As magnetic refrigeration technology matures, the microscopic optimization of magnetovolume effects to enhance the magnetocaloric properties may become a valuable tool in the search of new magnetic refrigerants.
publisher	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
issn	0018-9464
year published	2014
volume	50
issue	11
digital object identifier (doi)	10.1109/TMAG.2014.2326713
web of science category	Engineering, Electrical & Electronic; Physics, Applied
subject category	Engineering; Physics
unique article identifier	WOS:000349465900007