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

Volume

32

Issue

5

fYear

1996

fDate

9/1/1996 12:00:00 AM

Firstpage

4681

Lastpage

4683

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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.539117

Filename

539117