Magnetic read head and hard disk drive

Details Magnetic read head and hard disk drive Magnetic read head and hard disk drive

2007-04-24

2007-04-24

Cao, Allen (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

Reexamination Certificate

active

10845080

ABSTRACT:
A magnetic head using a tunneling magnetoresistance effect realizing both high output and wide bandwidth. By providing a magnetic read head and magnetic reading/playback apparatus related to the present invention characterized by comprising: a lower magnetic shield, an upper magnetic shield, a first electrode layer formed on said lower magnetic shield, a first ferromagnetic layer laminated on one end of said first electrode layer through a first insulator, a second ferromagnetic layer laminated on another end of said first electrode layer through a second insulator, a detecting electrode connected to said first ferromagnetic layer, and a second electrode layer electrically connecting said second ferromagnetic layer with said upper magnetic shield; it becomes possible to reduce the capacitance between the first ferromagnetic layer and the insulator and widen the bandwidth of the detecting signal.

REFERENCES:
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patent: 2005/0219772 (2005-10-01), Hayashi et al.
patent: 2006/0152862 (2006-07-01), Nakatani et al.
“Electrical Detection of Spin Precession in a Metallic Mesoscopic Spin Valve” Jedema, et al. Nature: vol. 416, Apr. 2002, pp. 713-716.
Nikkei Electronics, No. 774, p. 177-184 (2000) and English translation.

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