Monte Carlo study of nanowire magnetic properties

doi:10.1088/1674-1056/22/5/057504

Abstract In this work, we use Monte Carlo simulations to study the magnetic properties of a nanowire system based on a honeycomb lattice, in the absence as well as in the presence of both an external magnetic field and crystal field. The system is formed with N_L layers having spins that can take the values σ =± 1/2 and S=± 1,0. The blocking temperature is deduced, for each spin configuration, depending on the crystal field Δ. The effect of the exchange interaction coupling J_p between the spin configurations σ and S is studied for different values of temperature at fixed crystal field. The established ground-state phase diagram, in the plane (J_p, Δ), shows that the only stable configurations are: (1/2,0), (1/2,+1), and (1/2,-1). The thermal magnetization and susceptibility are investigated for the two spin configurations, in the absence as well as in the presence of a crystal field. Finally, we establish the hysteresis cycle for different temperature values, showing that there is almost no remaining magnetization in the absence of the external magnetic field, and that the studied system exhibits a super-paramagnetic behavior.

Keywords: Monte Carlo simulations nanowire magnetic field crystal field

Received: 07 September 2012
Revised: 03 December 2012
Accepted manuscript online:

PACS:	75.75.+a
	77.80.B-	(Phase transitions and Curie point)
	71.70.Gm	(Exchange interactions)
	61.46.Fg	(Nanotubes)

Corresponding Authors: L. Bahmad
E-mail: bahmad@fsr.ac.ma

Cite this article:

R. Masrour, L. Bahmad, A. Benyoussef Monte Carlo study of nanowire magnetic properties 2013 Chin. Phys. B 22 057504

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