Title :
Co-based superstructured nitride alloy films: characteristics and applications for high frequency heads
Author :
Kaminaka, N. ; Sakakima, H. ; Takahashi, K. ; Osano, K. ; Hasegawa, H.
Author_Institution :
Matsushita Electr. Ind. Co. Ltd., Osaka, Japan
fDate :
11/1/1990 12:00:00 AM
Abstract :
Co-based superstructured films composed of 25-nm-thick non-nitride and nitride layers were prepared by N2 reactive RF sputtering. The films have high 4πMs=13 kG, a high permeability μ=3000, and a high thermal stability of the magnetic properties. Magnetic heads composed of laminated superstructured films insulated with SiO2 films were developed for high-frequency operations. The heads show excellent recording capability for narrow gap recording with metal tapes and high reproduction characteristics at frequencies over 10 MHz. They achieve an increase of more than 4 dB in normalized output when compared with conventional laminated-type amorphous film heads. The superstructured nitride film heads are expected to be used in next-generation VCRs, which operate with higher density recording and wider frequency bands
Keywords :
cobalt alloys; magnetic heads; magnetic permeability; magnetic recording; magnetic thin film devices; niobium alloys; sputtered coatings; zirconium alloys; 10 MHz; 25 nm; Co-based superstructured nitride alloy films; CoNbZr-CoNbZrN; N2 reactive RF sputtering; SiO2; SiO2 films; VCR; high frequency heads; high permeability; high thermal stability; higher density recording; laminated superstructured films; magnetic properties; metal tapes; narrow gap recording; recording capability; wider frequency bands; Amorphous materials; Insulation; Magnetic films; Magnetic heads; Magnetic properties; Magnetic recording; Permeability; Radio frequency; Sputtering; Thermal stability;
Journal_Title :
Magnetics, IEEE Transactions on
