Title :
A magnetic head for 150 MHz, high density recording
Author :
Ash, K.P. ; Wachenschwanz, D. ; Brucker, C. ; Olson, J. ; Trcka, M. ; Jagielinski, T.
Author_Institution :
Eastman Kodak Co., San Diego, CA, USA
fDate :
11/1/1990 12:00:00 AM
Abstract :
A multilayered magnetic head that can read and write at 150 MHz on metal particle tape with a coercivity of 120 kA/m (1500 Oe) has been developed. Ten 2-μm layers of Fe68Ru8Ga7 Si17 alloy, with 100 nm of SiO2 used as spacer, form the magnetic-core thickness and the track width. The head was tested in a rotary recording system at a relative head-to-tape speed of 73 m/s. At a linear density of 4000 fc/mm (100 kfc) and 150 MHz, the measured single frequency signal to 300-kHz-slot noise was 33 dB (RMS-RMS). The measured frequency response curve agrees with theory and indicates a head-to-tape spacing of 70 nm at high speed. The read efficiency of the head decreases from 37% at low frequency to 15% at 150 MHz
Keywords :
gallium alloys; iron alloys; magnetic cores; magnetic heads; magnetic recording; random noise; ruthenium alloys; silicon alloys; 100 nm; 15 to 37 percent; 150 MHz; 2 micron; 70 nm; Fe68Ru8Ga7Si17 alloy; SiO2; coercivity; frequency response curve; head-to-tape spacing; high density recording; linear density; magnetic head; magnetic-core thickness; metal particle tape; multilayered magnetic head; read; read efficiency; relative head-to-tape speed; rotary recording system; single frequency signal; slot noise; track width; write; Coercive force; Density measurement; Frequency measurement; Gallium alloys; Iron alloys; Magnetic heads; Magnetic recording; Noise measurement; Silicon alloys; System testing;
Journal_Title :
Magnetics, IEEE Transactions on
