Magnetic detecting element
AssigneeAlps Electric Co., Ltd.
InventorsNaoya Hasegawa, Eiji Umetsu
Life of this patent
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Abstract
In a magnetic detecting element, second ferromagnetic layers are deposited on respective second antiferromagnetic layers. The magnetization direction of the second ferromagnetic layers is antiparallel to that of first ferromagnetic layers. A static magnetic field generated by a surface magnetic charge at the internal side surfaces of the first ferromagnetic layers is absorbed by the second ferromagnetic layers. Thus, it becomes hard that the static magnetic field from the first ferromagnetic layers enters the central portion of a free magnetic layer. Consequently, the central portion of the free magnetic layer can maintain its single magnetic domain state, and, thus, the hysteresis can be reduced and the Barkhausen noise is suppressed.
Claims14
A magnetic detecting element comprising:
- a multilayer laminate including a first antiferromagnetic layer, a pinned magnetic layer, a nonmagnetic material layer, and a free magnetic layer deposited in that order from below;
- a nonmagnetic interlayer deposited on the free magnetic layer;
- a pair of first ferromagnetic layers on the nonmagnetic interlayer in end portions in the track width direction of the magnetic detecting element, the first ferromagnetic layers being separated in a track width direction by a space therebetween;
- a pair of second antiferromagnetic layers separately deposited on the respective first ferromagnetic layers;
- a pair of second ferromagnetic layers separately deposited on the respective second antiferromagnetic layers;
- and
- electrode layers,
- wherein the magnetization direction of the second ferromagnetic layers is antiparallel to that of the first ferromagnetic layer.
Dependencies are inferred from the claim text.