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High frequency magnetic properties of CoFe/SiO2 multilayer film with the inverse magnetostrictive effect

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2 Author(s)
Senda, Masakatsu ; Visual Commun. Sector, NTT Corp., Tokyo, Japan ; Ishii, Osamu

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

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Magnetics, IEEE Transactions on  (Volume:30 ,  Issue: 1 )