Title :
Read performance of tunneling magnetoresistive heads
Author :
Ishihara, K. ; Nakada, M. ; Fukami, E. ; Nagahara, K. ; Honjo, H. ; Ohashi, K.
Author_Institution :
NEC Corp., Tokyo, Japan
fDate :
7/1/2001 12:00:00 AM
Abstract :
We discuss the read performance, including the off-track performance and noise characteristics, of TMR heads. A vortex-like sense current field in TMR heads creates insensitive zones in the free layer and affects the output voltage and effective read width. The 1/f noise in the MHz-order frequency range was observed. To achieve a low-noise TMR head for high-density recording with small junction area, a high-quality thin barrier is a key to obtaining low 1/f noise, as well as small R·A products to reduce the shot noise
Keywords :
1/f noise; magnetic heads; magnetic recording noise; shot noise; tunnelling; 1/f noise; MHz-order frequency range; effective read width; free layer; high-density recording; high-quality thin barrier; insensitive zones; noise characteristics; off-track performance; output voltage; read performance; tunneling magnetoresistive heads; vortex-like sense current field; Acoustical engineering; Electrodes; Electronics industry; Frequency; Magnetic heads; Noise reduction; Oxidation; Permanent magnets; Tunneling magnetoresistance; Voltage;
Journal_Title :
Magnetics, IEEE Transactions on
