Patent ID: 6171693
Filing Date: 2001-01-09
Classification: B82Y,G01R,G11B,H01F,Y10S,Y10T

Abstract:
A magnetic structure comprising:a first film of nonferromagnetic metal, said first film having a crystalline structure;a second film of a ferromagnetic metal, said second film having the same crystalline structure as said first film and lattice spacings within 2% of those of said first film, based upon the lattice spacings of said first film, said second film having a magnetic coercivity;a third film of a ferromagnetic metal, said third film having the same crystalline structure as said first film and lattice spacings within 2% of those of said first film, based upon the lattice spacings of said first film, said second film and said third film being made of either the same metals with their relative magnetic coercivities being determined by their respective layer thicknesses, or of different materials having different magnetic coercivities, said first film forming an intervening layer between said second film and said third film;a fourth film between said first film and said second film, or between said first film and said third film, said fourth film having:a crystalline structure different than that of said first film; orthe same crystalline structure as said first film with lattice spacings differing by greater than 2% from the lattice spacings of said first film, said second film, and said third film, based upon the lattice spacings of said fourth film.