Patent ID: 6072667
Filing Date: 2000-06-06
Classification: G01R,G11B

Abstract:
A magnetic head comprising a ring type magnetic head for sending and receiving signals with a magnetic medium,wherein the material comprising said ring type magnetic head includes at least ferrite, said ferrite having a negative magnetostriction constant, and a material having a smaller thermal expansion coefficient than that of said ferrite is attached on the side surface of said ring type magnetic head in a magnetic path on the side of the head being formed in gap depth direction,wherein a curve of magnetic flux density versus magnetic field strength in rubbing direction differs from a curve of magnetic flux density versus magnetic field strength in gap direction of said magnetic medium of substances comprising a magnetic circuit, and each substance has a higher curve of magnetic flux density versus magnetic field strength than at a time of no stress on said ring type magnetic head, andwherein initial permeability .mu.1 in rubbing direction and initial permeability .mu.2 in gap depth direction of said magnetic medium of substances comprising a magnetic circuit meet the following formula 1:1.1<.mu.1/.mu.2<1.4 (formula 1).