The migration process of Co ions in the cobalt-ferrite epitaxial layer on γ-Fe_(2)O_(3) powder has been studied by magnetic thermal annealing method.The activation energy E and coefficient A of Co ions have been meas...The migration process of Co ions in the cobalt-ferrite epitaxial layer on γ-Fe_(2)O_(3) powder has been studied by magnetic thermal annealing method.The activation energy E and coefficient A of Co ions have been measured.An abnormal increase of coercivity of sample annealed in a transverse magnetic field was found.On the basis of Mdssbauer and XPS results the reason of this phenomenon is discussed.展开更多
The remanence direction of Nd2Fe14B permanent magnet at 77K,initially at saturated remanence along the grain oriented direction,as a function of magnetic field applied along a direction making 70°with the initial...The remanence direction of Nd2Fe14B permanent magnet at 77K,initially at saturated remanence along the grain oriented direction,as a function of magnetic field applied along a direction making 70°with the initial remanence direction is calculated neglecting the magnetic interaction between the crystallites.The results are very different from the experimental results obtained by using torque method.展开更多
基金supported by National Science Foundation of China.
文摘The migration process of Co ions in the cobalt-ferrite epitaxial layer on γ-Fe_(2)O_(3) powder has been studied by magnetic thermal annealing method.The activation energy E and coefficient A of Co ions have been measured.An abnormal increase of coercivity of sample annealed in a transverse magnetic field was found.On the basis of Mdssbauer and XPS results the reason of this phenomenon is discussed.
文摘The remanence direction of Nd2Fe14B permanent magnet at 77K,initially at saturated remanence along the grain oriented direction,as a function of magnetic field applied along a direction making 70°with the initial remanence direction is calculated neglecting the magnetic interaction between the crystallites.The results are very different from the experimental results obtained by using torque method.
