MAGNETORESISTIVE ELEMENT AND MAGNETIC RANDOM ACCESS MEMORY
First Claim
1. A magnetoresistive element comprising:
- a first ferromagnetic layer having changeable magnetization substantially perpendicular to a film plane;
a second ferromagnetic layer having fixed magnetization substantially perpendicular to the film plane;
a first nonmagnetic layer provided between the first ferromagnetic layer and the second ferromagnetic layer;
a third ferromagnetic layer provided on the opposite side of the second ferromagnetic layer from the first nonmagnetic layer, the third ferromagnetic layer having magnetization substantially parallel to the film plane, the third ferromagnetic layer generating a rotating magnetic field when spin-polarized electrons are injected thereinto; and
a second nonmagnetic layer provided between the second ferromagnetic layer and the third ferromagnetic layer, whereinthe magnetization of the first ferromagnetic layer is reversed by the rotating magnetic field generated from the third ferromagnetic layer when a first current is flowed in one of a direction from the third ferromagnetic layer toward the first ferromagnetic layer via the second ferromagnetic layer and a direction from the first ferromagnetic layer toward the third ferromagnetic layer via the second ferromagnetic layer, and,when a second current having a different current density from the first current is flowed in the one direction, the magnetization of the first ferromagnetic layer is reversed by electrons spin-polarized by the second ferromagnetic layer to a different direction from the magnetization caused when the first current is flowed.
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Accused Products
Abstract
A magnetoresistive element according to an embodiment includes: a first ferromagnetic layer having changeable magnetization substantially perpendicular to a film plane; a second ferromagnetic layer having fixed magnetization substantially perpendicular to the film plane; a first nonmagnetic layer provided between the first ferromagnetic layer and the second ferromagnetic layer; a third ferromagnetic layer provided on the opposite side of the second ferromagnetic layer from the first nonmagnetic layer, the third ferromagnetic layer having magnetization substantially parallel to the film plane, the third ferromagnetic layer generating a rotating magnetic field when spin-polarized electrons are injected thereinto; and a second nonmagnetic layer provided between the second ferromagnetic layer and the third ferromagnetic layer.
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Citations
20 Claims
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1. A magnetoresistive element comprising:
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a first ferromagnetic layer having changeable magnetization substantially perpendicular to a film plane; a second ferromagnetic layer having fixed magnetization substantially perpendicular to the film plane; a first nonmagnetic layer provided between the first ferromagnetic layer and the second ferromagnetic layer; a third ferromagnetic layer provided on the opposite side of the second ferromagnetic layer from the first nonmagnetic layer, the third ferromagnetic layer having magnetization substantially parallel to the film plane, the third ferromagnetic layer generating a rotating magnetic field when spin-polarized electrons are injected thereinto; and a second nonmagnetic layer provided between the second ferromagnetic layer and the third ferromagnetic layer, wherein the magnetization of the first ferromagnetic layer is reversed by the rotating magnetic field generated from the third ferromagnetic layer when a first current is flowed in one of a direction from the third ferromagnetic layer toward the first ferromagnetic layer via the second ferromagnetic layer and a direction from the first ferromagnetic layer toward the third ferromagnetic layer via the second ferromagnetic layer, and, when a second current having a different current density from the first current is flowed in the one direction, the magnetization of the first ferromagnetic layer is reversed by electrons spin-polarized by the second ferromagnetic layer to a different direction from the magnetization caused when the first current is flowed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification