The design idea on the automatically recognizing the difference of the complicated shape of ferromagnetic material (such as lathe tools) is given in this paper.

When ferromagnetic wear debris was in the coil of inductive wear debris sensor,the magnetic field distribution of the coil was changed through magnetization,and hence the equivalent inductance of the coil was changed.

Basic characteristics of magnetic field and magnetic fluid of aluminum reduction cells,design of magnetic field balance,feature of magnetic fluid dynamic changes,effects of ferromagnetic substances and effect of magnetic field on reeduction process are discussed.

A method of mcasuring the Curie temperature of ferromagnetic substance by oscilloscope is presented in this paper, showing vividly that the magnetic of ferromagnetic substance varies with temperature.

Exact diagonalization solution and coherent state variational method of the coupling system of carrier and ferromagnetic material;

Discussion on the production of bound magnetic polaron in ferromagnetic material with impurity potential;

The ferromagnetic material detector is introduced,which is low in price,easy to understand and high in teaching effect,with the result that it enormously enriches the content of magnetism and sensor technique in physics experiments.

The static electric screen in the inner side of conductor with high conductivity and the static magnetic screen in the inner side of ferromagnetic medium with high magnetic conductivity are very similar in appearance, yet they are dramatically different in mature.