Magnetic hysteresis and compensation behavior of a mixed spin-（1, 3/2） Ising model on a square lattice are investigated in the framework of effective field theory based on a probability distribution technique. The e...Magnetic hysteresis and compensation behavior of a mixed spin-（1, 3/2） Ising model on a square lattice are investigated in the framework of effective field theory based on a probability distribution technique. The effect of random crystal field, ferromagnetic and ferrimagnetic exchange interaction on hysteresis loops and compensation phenomenon are discussed. A number of characteristic phenomena have been reported such as the observation of triple hysteresis loops at low temperatures and for negative values of random crystal field. Critical and double compensation temperatures have been also found. The obtained results are also compared to some previous works.展开更多
The electronic and magnetic properties of the zinc-blende aluminum nitride doped with V and Cr are studied using the density functional theory(DFT),namely the KKR-CPA-PBE method.Pure Al N is found to be a wide band ga...The electronic and magnetic properties of the zinc-blende aluminum nitride doped with V and Cr are studied using the density functional theory(DFT),namely the KKR-CPA-PBE method.Pure Al N is found to be a wide band gap semiconductor,and doping V and Cr single impurities generate ferromagnetic half-metallic behavior.Moreover,the values of the formation energy reveal that these compounds are stable systems for all dopant concentrations.A self-consistent energy minimization scheme determines the ferromagnetic state as the stable magnetic state for V-and Cr-doping Al N.A double exchange mechanism is identified as the mechanism responsible for magnetism in our systems.When increasing doping impurities,the total magnetic moments increase linearly and the Curie temperature TC,calculated using the mean-field approximation,shows a significant change.The present findings reveal Cr-and V-doped zincblende Al N as potential candidates for high Curie temperature ferromagnetic materials.展开更多
文摘Magnetic hysteresis and compensation behavior of a mixed spin-（1, 3/2） Ising model on a square lattice are investigated in the framework of effective field theory based on a probability distribution technique. The effect of random crystal field, ferromagnetic and ferrimagnetic exchange interaction on hysteresis loops and compensation phenomenon are discussed. A number of characteristic phenomena have been reported such as the observation of triple hysteresis loops at low temperatures and for negative values of random crystal field. Critical and double compensation temperatures have been also found. The obtained results are also compared to some previous works.
基金the Académie Hassan II des Sciences et Techniques,Morocco,for its financial support。
文摘The electronic and magnetic properties of the zinc-blende aluminum nitride doped with V and Cr are studied using the density functional theory(DFT),namely the KKR-CPA-PBE method.Pure Al N is found to be a wide band gap semiconductor,and doping V and Cr single impurities generate ferromagnetic half-metallic behavior.Moreover,the values of the formation energy reveal that these compounds are stable systems for all dopant concentrations.A self-consistent energy minimization scheme determines the ferromagnetic state as the stable magnetic state for V-and Cr-doping Al N.A double exchange mechanism is identified as the mechanism responsible for magnetism in our systems.When increasing doping impurities,the total magnetic moments increase linearly and the Curie temperature TC,calculated using the mean-field approximation,shows a significant change.The present findings reveal Cr-and V-doped zincblende Al N as potential candidates for high Curie temperature ferromagnetic materials.
