中国物理B ›› 2013, Vol. 22 ›› Issue (5): 57504-057504.doi: 10.1088/1674-1056/22/5/057504

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Monte Carlo study of nanowire magnetic properties

R. Masroura b, L. Bahmada, A. Benyoussefb   

  1. a Laboratoire de Magnétisme et Physique des Hautes Energies, URAC 12,Université Mohammed V-Agdal, Faculté des Sciences, B.P. 1014, Rabat, Morocco;
    b Laboratory of Materials, Process, Environment and Quality, Cady Ayyad University, National School of Applied Sciences, Safi, Morocco
  • 收稿日期:2012-09-07 修回日期:2012-12-03 出版日期:2013-04-01 发布日期:2013-04-01

Monte Carlo study of nanowire magnetic properties

R. Masroura b, L. Bahmada, A. Benyoussefb   

  1. a Laboratoire de Magnétisme et Physique des Hautes Energies, URAC 12,Université Mohammed V-Agdal, Faculté des Sciences, B.P. 1014, Rabat, Morocco;
    b Laboratory of Materials, Process, Environment and Quality, Cady Ayyad University, National School of Applied Sciences, Safi, Morocco
  • Received:2012-09-07 Revised:2012-12-03 Online:2013-04-01 Published:2013-04-01
  • Contact: L. Bahmad E-mail:bahmad@fsr.ac.ma

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摘要： 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 NL 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 Jp 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 (Jp, 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.

关键词: Monte Carlo simulations, nanowire, magnetic field, crystal field

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 NL 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 Jp 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 (Jp, 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.

Key words: Monte Carlo simulations, nanowire, magnetic field, crystal field

中图分类号: 

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