Title :
Thermal asperity of TMR heads for removable disk drives
Author :
Ohashi, Keishi ; Sato, Akinobu ; Ishihara, Kunihiko ; Matsubara, Takao ; Mitsuzuka, Tsutomu ; Tsuge, Hisanao ; Ishiwata, Nobuyuki
Author_Institution :
NEC Corp., Tokyo, Japan
fDate :
7/1/2001 12:00:00 AM
Abstract :
The thermal asperity of the tunneling magnetoresistive (TMR) head was studied using Zip-type flexible media, and compared with that of the anisotropic magnetoresistive (AMR) head. The examined head had a shielded structure with the TMR element close to the air bearing surface. Nevertheless, it generated relatively small thermal asperity even when the mechanical spacing between the head and medium was less than 20 nm, at which large and frequent thermal asperity was observed when the AMR head was used. Such relatively small thermal asperity of the TMR head Is attributed mainly to the small low-temperature coefficient of the electrical resistivity of the TMR element
Keywords :
disc drives; magnetic disc storage; magnetic heads; magnetoresistive devices; 0 to 20 nm; TMR heads; Zip-type flexible media; air bearing surface; electrical resistivity; hard disks; low-temperature coefficient; mechanical spacing; removable disk drives; shielded structure; thermal asperity; tunneling magnetoresistive head; Anisotropic magnetoresistance; Disk drives; Electric resistance; Giant magnetoresistance; Magnetic anisotropy; Magnetic heads; Magnetic recording; Perpendicular magnetic anisotropy; Testing; Tunneling magnetoresistance;
Journal_Title :
Magnetics, IEEE Transactions on
