Title :
Co-Ni-Fe write heads with a 10-μm yoke length for high-speed recording
Author :
Nonaka, Y. ; Honjo, H. ; Toba, T. ; Saito, S. ; Ishi, T. ; Saito, M. ; Ishiwata, N. ; Ohashi, K.
Author_Institution :
Function Devices Res. Labs., NEC Corp., Tokyo, Japan
fDate :
9/1/2000 12:00:00 AM
Abstract :
We have developed a Co-Ni-Fe write head with a short yoke length for high-speed recording. By reducing the yoke length to 9.5 μm, the eddy currents induced in a yoke with a relatively low resistivity (0.2 μΩm) were reduced. The head of this short yoke had good write performance for a medium with a coercivity of 400 kA/m (5000 Oe) at frequencies up to 250 MHz (the overwrite less than -30 dB, and nonlinear transition shift less than 7%)
Keywords :
cobalt alloys; coils; eddy currents; ferromagnetic materials; hard discs; iron alloys; magnetic heads; nickel alloys; 0 to 250 MHz; 0.2 muohmm; 9.5 micron; CoNiFe; eddy currents; hard disks; high-speed recording; nonlinear transition shift; overwrite; resistivity; write heads; yoke length; Coercive force; Conductivity; Disk recording; Eddy currents; Frequency; H infinity control; Hard disks; Magnetic heads; Technological innovation; Time factors;
Journal_Title :
Magnetics, IEEE Transactions on
