Magnetic Nanoparticles with Core Shell: Macroscopic Model and Coercive Field

[摘要] There exists nonhomogeneous structure in mechanosynthesized nanoparticlesconsisting of an ordered core surrounded by the shell. The shell may be structurally and magnetically disordered, or it may be ordered. These nanoparticlesare found to be roughly spherical. We formulate the macroscopic model for the description of magnetic properties of nanoparticles with core-shell structure. The case of spheroids oriented in the same direction of polar axes is considered. There exits two coercive fields:HcγandHcψ. They are depending on quantitiesoandx, wherex=V2/(V1−2V2), ando=IF/IS, hereV1is the volume of the nanoparticle, andV2is the volume of the core.IFis the magnetization of the core, andISis themagnetization of the shell. There exists a transition from one type of the coercive field to another, changingxando. We have found qualitative explanationof observed enhancement of coercive field and of itsd-dependence inNiFe2O4nanoparticles.

[学科分类] 材料工程