HIGH COERCIVITY PT/CO MULTILAYERS

Micromagnetism and high temperature coercivity of MnBiÕAl multilayers

The micromagnetic properties of multilayered MnBi/Al films have been investigated and compared to pure MnBi thin films. Pure MnBi films reveal an anomalous increase of the high temperature coercivity, which has been explained on the basis of a hybrid domain wall pinning model. The multilayer-type preparation of MnBi/Al thin films results in significantly reduced MnBi particle size of approximat...

Growth, structural, and magnetic properties of high coercivity CoÕPt multilayers

Electron beam evaporated Co/Pt multilayers $@Co(tCo nm!/Pt~1 nm!#10, 0.2,tCo,2 nm% with perpendicular magnetic anisotropy and room temperature coercivities Hc52– 15 kOe are studied as a function of growth temperature TG. Hysteresis loops and magnetic force microscopy ~MFM! indicate changes in the magnetization reversal mechanism along with a sharp increase in coercivity for TG*230– 250 °C. Film...

Coercivity and exchange bias of ferromagnetic/antiferromagnetic multilayers

For a model system consisting of a ferromagnetic layer exchange coupled to an antiferromagnetic layer with a compensated interface, detailed mean-field-type calculations are performed. Both the coercive field and the exchange bias field are calculated. For the coercive field, a rather broad enhancement around the Néel temperature TN of the antiferromagnetic layer is found irrespective of whethe...

CoFe2O4 nanostructures with high coercivity

Deterioration of the coercivity due to the diffusion induced interface layer in hard/soft multilayers.

Hard/soft permanent magnets have aroused many interests in the past two decades because of their potential in achieving giant energy products as well as their rich variety of magnetic behaviors. Nevertheless, the experimental energy products are much smaller than the theoretical ones due to the much smaller coercivity measured in the experiments. In this paper, the deterioration of the coercivi...