PURPOSE: To prevent the lowering of a magnetic permeability when a large anisotropic stress is applied on a magnetic core and the deterioration in the electromagnetic conversion characteristics of the magnetic head by forming an upper magnetic film and a lower magnetic film to a circular shape.
CONSTITUTION: This magnetic head consists of the lower magnetic film 2 formed on an Al2O3 film 12 of a substrate 1 and the upper magnetic film 3 which is formed on the lower magnetic film 2 in such a manner as to bring one end 31 into contact with one end 21 of the lower magnetic film 2 and to dispose the other end 32 to face the other end of the lower magnetic film 22 via a magnetic gap G and constitutes a magnetic circuit having a magnetic gap S in a part together with the lower magnetic film 2. The stress acting on the films is determined by the shape of the magnetic core and since the region in the front end part of the core is sensitive to recording and reproducing characteristics, the lower and upper magnetic materials 2, 3 are formed to the circular shape so as to relieve the stress in the front end part of the core. The magnetic anisotropy of the upper magnetic film 3 and the lower magnetic film 2 of the thin-film magnetic head is diminished in this way and the stable electromagnetic conversion characteristics which obviates the generation of the reproducing waveform distortions are obtd.
NARUSHIGE SHINJI
MITSUOKA KATSUYA
IMAGAWA TAKAO
SANO MASAAKI
NISHIOKA KOICHI
SUDO SHUJI
KOYANAGI HIROAKI
KOBAYASHI TETSUO
Next Patent: SUBSTRATE FOR THIN-FILM MAGNETIC HEAD