03 ) 7 permanent magnets with high Cu, low Fe, fit Zr, little z had room temperature intrinsic coercivity H ci 1?830.

The high intrinsic coercivity Nd10.

The highest room temperature intrinsic coercivity iHc is achieved at more than 2 400 kA/m for z=7.

The relation between the remanence and the intrinsic coercive field of periodic and quasi-periodic configuration Sm-Co/α-Fe multilayers and thickness and layer-number of the system are investigated by using the micromagnetic theory.

To forecast the magnetism of hard/soft exchange-coupling bilayers, the relation between the intrinsic coercive field of the bilayers and the angle between orientation of magnetic field and easy axes of hard layer was investigated by using three-dimension dynamic model based on micromagnetic theory.

XRD results show that the intrinsic coercive force of annealed powders sharply increases.

By adjusting the formula,adding additives,adopting reasonable technique,permanent ferrite magnets with intrinsic coercive force of 380kA/m were developed,which eliminates the demagnetization at low temperature,and have satisfied the needs of the starting motor of automobile.

This paper discusses the methods of obtaining Sr-ferrite oxysome materials of high intrinsic coercivity by using high-purity Fe2O3 and SrCO3 as raw materials and CaCO3, SiO2, and LaCO as additives, and by controlling the molar ratio of the raw materials, the amount of the additives and the particle size of powder.