Magnetoresistive device of the CPP type, and magnetic disk...

Details Magnetoresistive device of the CPP type, and magnetic disk... Magnetoresistive device of the CPP type, and magnetic disk...

2011-06-14

2011-06-14

Castro, Angel A. (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

Reexamination Certificate

active

07961438

ABSTRACT:
The invention provides a magnetoresistive device of the CPP (current perpendicular to plane) structure, comprising a magnetoresistive unit, and a first shield layer and a second shield layer which are located and formed such that the magnetoresistive unit is sandwiched between them with a sense current applied in a stacking direction. The magnetoresistive unit comprises a nonmagnetic intermediate layer, and a first ferromagnetic layer and a second ferromagnetic layer stacked and formed such that the nonmagnetic intermediate layer is sandwiched between them. The first shield layer and the second shield layer are each controlled by magnetization direction control means in terms of magnetization direction to create an antiparallel magnetization state where their magnetizations are in opposite directions. The first ferromagnetic layer and the second ferromagnetic layer are exchange coupled to the first shield layer and the second shield layer, respectively, by way of a first exchange coupling function gap layer and a second exchange coupling function gap layer, with an exchange coupled strength of 0.2 to 2.5 erg/cm2.

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