Title :
Write frequency dependence of power loss in inductive heads
Author_Institution :
Samsung HDD R&D, San Jose, CA, USA
fDate :
March 30 2003-April 3 2003
Abstract :
In this paper, the AC power loss due to joule heating from the write coil is calculated using Fourier series approach. This calculation is to predict TPTP as functions of write current, write frequency (up to 1 GHz), current rise time, and overshoot. After deriving the Fourier series for a periodic current waveform at harmonic frequencies (I/sub n/), we compute the power loss (I/sub n//sup 2/ Rac) at each harmonic. Sum of power loss of each harmonic will give the total AC power loss of inductive head. A GMR head for 60 Gb/in/sup 2/ areal density is used for this study.
Keywords :
Fourier series; giant magnetoresistance; harmonics; magnetic heads; magnetoresistive devices; 1 GHz; AC power loss; Fourier series; GMR; areal density; current rise time; giant magneto resistance; harmonic frequency; inductive heads; joule heating; overshoot; periodic current waveform; thermal protrusion pole tip; write current; write frequency dependence; write-in; Coils; Degradation; Finite element methods; Fourier series; Frequency dependence; Hard disks; Heating; Silicon compounds; Temperature; Writing;
Conference_Titel :
Magnetics Conference, 2003. INTERMAG 2003. IEEE International
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-7647-1
DOI :
10.1109/INTMAG.2003.1230345
