Title :
High frequency magnetic properties of CoFe/SiO2 multilayer film with the inverse magnetostrictive effect
Author :
Senda, Masakatsu ; Ishii, Osamu
Author_Institution :
Visual Commun. Sector, NTT Corp., Tokyo, Japan
fDate :
1/1/1994 12:00:00 AM
Abstract :
The high frequency magnetic properties of CoFe/SiO2 multilayer film, which has magnetic anisotropy induced by the inverse magnetostrictive effect, are examined with a view to applying it as a low loss soft magnetic material in the MHz-GHz range. The inverse magnetostrictive effect was used to produce a large uniaxial anisotropy field of 200-250 Oe. A CoFe magnetic layer, with a large saturation magnetization of 24.5 kG and a magnetostriction of +10-4, was selected, and patterned in strips to produce an anisotropic film stress of -109 dyn/cm2. A relative permeability of 40 and a cut-off frequency of about 7 GHz were achieved in CoFe/SiO2 (50/100 nm) film, and these values agree well with values obtained by calculation and from static magnetic properties
Keywords :
cobalt alloys; ferromagnetic properties of substances; induced anisotropy (magnetic); iron alloys; magnetic multilayers; magnetic permeability; magnetostriction; silicon compounds; solid-state microwave devices; 7 GHz; CoFe-SiO2; CoFe/SiO2 multilayer film; GHz range; anisotropic film stress; cutoff frequency; high frequency magnetic properties; induced magnetic anisotropy; inverse magnetostrictive effect; large uniaxial anisotropy field; low loss soft magnetic material; relative permeability; saturation magnetization; static magnetic properties; strip patterning; Anisotropic magnetoresistance; Frequency; Magnetic anisotropy; Magnetic films; Magnetic multilayers; Magnetic properties; Magnetostriction; Perpendicular magnetic anisotropy; Saturation magnetization; Soft magnetic materials;
Journal_Title :
Magnetics, IEEE Transactions on
