Title :
Soft-magnetic multilayers for video recording heads
Author :
Dirne, F.W.A. ; de Wit, H.J. ; Witmer, C.H.M. ; Boher, P. ; Houdy, Ph. ; Rotman, G.H. ; Ruigrok, J.J.M.
Author_Institution :
Philips Res. Lab., Eindhoven, Netherlands
fDate :
11/1/1991 12:00:00 AM
Abstract :
The effect of inducing a uniaxial anisotropy in microcrystalline Fe/FeCrB multilayers by applying a magnetic field during deposition was studied. Not only a reduction of remanent magnetization, but also an increase of permeability (at 10 MHz) are the result. In the hard axis direction a permeability of 6000 is found for a 10 nm/3 nm Fe/FeCrB multilayer. Calculations show that such high permeabilities are interesting for high-density recording heads without ferrite in the core. The domain structure in the head shows the presence of the uniaxial anisotropy. Large unwanted closure domains, in which rotation permeability is low, are present
Keywords :
boron alloys; ferromagnetic properties of substances; iron; iron alloys; magnetic anisotropy; magnetic domains; magnetic heads; magnetic hysteresis; magnetic permeability; magnetic thin film devices; remanence; silicon alloys; sputtered coatings; video recording; Fe-FeCrB multilayers; closure domains; domain structure; high-density recording heads; hysteresis loops; microcrystalline Fe/FeCrB multilayers; permeability; reduction of remanent magnetization; soft magnetic multilayers; sputtered layers; uniaxial anisotropy; video recording heads; Anisotropic magnetoresistance; Ferrites; Iron; Magnetic cores; Magnetic films; Magnetic heads; Magnetic multilayers; Nonhomogeneous media; Permeability; Video recording;
Journal_Title :
Magnetics, IEEE Transactions on
