Magnetic read head

Details Magnetic read head Magnetic read head

2004-12-20

2008-03-25

Miller, Brian E. (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

C338S03200R, C324S207210

Reexamination Certificate

active

07349186

ABSTRACT:
A TMR head capable of reconciling high output with high band width is implemented. To that end, two multilayered films each comprised of an insulating layer and a ferromagnetic layer are formed at different locations on an electrode layer, and a current is caused to flow from the ferromagnetic layer of a first multilayered film to the electrode layer while polarized spin is diffused up to a portion of the electrode layer, directly underneath the other multilayered film comprised of the insulating layer and the ferromagnetic layer, thereby detecting a change in resistance, according to a change in the magnetization direction of the ferromagnetic layer of a second multilayered film by use of a circuit extremely large in input impedance, such as a FET.

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patent: 2002/0084500 (2002-07-01), Kang et al.
patent: 2006/0262458 (2006-11-01), Carey et al.
Matsuzaki, Mikio et al., “Making a Prototype TMR Head: the Arrangement of a Hard Magnetic Layer a Key”, Nikkei Electronics, No. 774 (2000), pp. 177-184, with 9 pages of English translation of the relevant portion.
Jedema et al, “Electrical Detection of Spin Precession in a Metallic Mesoscopic Spin Valve”, Nature, vol. 416 (Apr. 18, 2002), pp. 713-716.

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