METHOD FOR CONTROLLING UNIAXIAL MAGNETIC ANISOTROPY OF AMORPHOUS SOFT MAGNETIC MATERIAL

摘要

PURPOSE:To control the magnitude of uniaxial magnetic anisotropy at a low temp. by disposing an amorphous soft magnetic material imparted with the uniaxial magnetic anisotropy in a rotating magnetic field in a vacuum and subjecting said material to a heat treatment at the temp. lower than the crystallization temp. and Curie temp. CONSTITUTION:The amorphous soft magnetic material is produced by a spurttering method, etc. by disposing the same in the static magnetic field impressed in the direction interesting approximately orthogonally with the direction where the high high-frequency magnetic permeability is desired to be finally obtd. The uniaxial magnetic anisotropy having the easy axis in the above-mentioned direction where the static magnetic field is impressed is thereby imparted to the above-mentioned material. The sample consisting of the above-mentioned material is thereafter disposed in a furnace 3 in which vacuum or nonoxidative atmosphere such as gaseous N2 is maintained. A motor 7 is then driven to rotate a magnet 6 mounted to a yoke 5 and the magnetic field rotating relatively within the plane inclusive of the above- mentioned easy axis direction and the direction where the high high-frequency magnetic permeability is desired to be finally obtd. is impressed to the sample. The sample is further heat-treated at the temp. lower than the crystallization temp. and Curie temp. The magnitude of the uniaxial magnetic anisotropy of the sample is controlled by this temp.