Magnetization plateaus of a ferrimagnetic nanoparticle in the presence of single-ion anisotropies

作者：Jiang Wei^*; Liu Li mei; Li Xiao xi; Deng Qi; Guan Hong yu; Zhang Fan; Guo An bang

来源：Physica B: Condensed Matter , 2012, 407(19): 3933-3938.

DOI：10.1016/j.physb.2012.05.059

• Hexagonal nanoparticle
• Magnetization plateaus
• Effective-field theory with differential operator

The magnetization of a ferrimagnetic mixed-spin nanoparticle for a series of different single-ion anisotropies D1 and D2 with increasing external magnetic field is studied by the use of the effective- field theory with correlations. At low temperature, the magnetization exhibits an obvious step effect for different anisotropies, exchange couplings, and external magnetic field. The results show that the positive single-ion anisotropy D1 (or D2) is a necessary element for the emergence of the accessional magnetization plateaus for the ferrimagnetic mixed-spin nanoparticle. However, for the stronger D2 the magnetization plateaus dissatisfy the 2S + 1 criterion in such a ferrimagnetic nanoparticle system.

• 出版日期2012-10-1
• 单位沈阳工业大学