| 摘要 |
PROBLEM TO BE SOLVED: To easily magnetize only in the direction of magnetic field which is initially applied after initiallization, by a method wherein MnBi magnetic powder has the magnetization intensity which greatly differs by the application direction of magnetic field. SOLUTION: Mn Bi magnetic powder and a magnetic material (other magnetic material), which is easily saturation magnetized in the low magnetic field lower than 1000 Oe, are used irrespective of the application direction of magnetic field. A magnetic material having the coercive force of 1000 Oe or lower is used as another magnetic material. It is desirable to use a ferroalloy as a metal and spinel ferrite as an oxide for the above-mentioned magnetic materials. Also, pertaining to the ratio B/A of the magnetization value A when magnetic field is applied in positive direction and the magnetization value B when magnetic field is applied in negative direction, they can be controlled at the arbitrary value by changing the content of the component in the magnetic material. The ratio B/A of magnetization value is set in 2 to 60% in absolute value. |
