Magnetoresistive element, and magnetic memory using the same

Static information storage and retrieval – Systems using particular element – Magnetic thin film

Reexamination Certificate

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C365S173000, C365S180000, C365S158000

Reexamination Certificate

active

06898115

ABSTRACT:
A magnetoresistive film has at least a first magnetic layer, a second magnetic layer, a nonmagnetic layer, a third magnetic layer, and a fourth magnetic layer stacked in the order named. In the magnetoresistive film, at least the first magnetic layer contains Gd and the fourth magnetic layer contains Tb and/or Dy, each of the first magnetic layer and fourth magnetic layer has an easy axis of magnetization along a perpendicular direction to a film plane, and the second magnetic layer and the third magnetic layer have a greater spin polarization than the first magnetic layer and the fourth magnetic layer. Furthermore, the second and third magnetic layers are magnetic layers containing at least Co and Co contents thereof are not less than 20 at. % nor more than 90 at. %.

REFERENCES:
patent: 5801984 (1998-09-01), Parkin
patent: 5966323 (1999-10-01), Chen et al.
patent: 6022633 (2000-02-01), Hayashi et al.
patent: 6219275 (2001-04-01), Nishimura
patent: 6329078 (2001-12-01), Tsuge
patent: 6456467 (2002-09-01), Mao et al.
Patent Abstracts of Japan, for JPLAO 11-13587, published May 21, 1999.

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