Title :
Magnetic permeability measurements in GMR multilayers with extra-thick magnetic layers
Author :
Klemmer, T.J. ; Pirkle, B.H. ; Hossain, S.A. ; Fujiwara, H. ; Parker, M.R.
Author_Institution :
Mater. for Inf. Technol., Alabama Univ., Tuscaloosa, AL, USA
fDate :
9/1/1996 12:00:00 AM
Abstract :
Initial permeability and transverse bias permeability measurements have been made on [NiFeCo(t)/Cu(23 Å)]16 multilayers for different magnetic layer thicknesses(t) in the as-deposited state and after an annealing treatment. The initial permeability was found to be independent of frequency up to at least 100 MHz and to increase with magnetic layer thickness. The transverse bias permeability is used to calculate the effective uniaxial anisotropy and the bilinear and biquadratic exchange fields. The thicker multilayers are found to be ferromagnetically coupled in the as-deposited state and upon annealing a transition occurs producing antiferromagnetically coupled magnetic layers
Keywords :
annealing; antiferromagnetic materials; cobalt alloys; copper; exchange interactions (electron); ferromagnetic materials; giant magnetoresistance; iron alloys; magnetic anisotropy; magnetic multilayers; magnetic permeability; nickel alloys; 100 MHz; 23 A; NiFeCo-Cu; [NiFeCo/Cu]6 multilayers; annealing treatment; antiferromagnetically coupled magnetic layers; bilinear exchange fields; biquadratic exchange fields; effective uniaxial anisotropy; extra-thick magnetic layers; ferromagnetically coupled; initial permeability; magnetic permeability; transverse bias permeability; Annealing; Antiferromagnetic materials; Frequency; Giant magnetoresistance; Magnetic anisotropy; Magnetic field measurement; Magnetic materials; Magnetic multilayers; Permeability measurement; Perpendicular magnetic anisotropy;
Journal_Title :
Magnetics, IEEE Transactions on
