Strain sensor element and blood pressure sensor
First Claim
1. A strain sensor element comprising:
- a laminated film provided above a substrate,the laminated film comprising;
a free layer which has a perpendicular magnetic anisotropy, wherein the free layer has a first magnetization;
a reference layer comprising a second magnetization; and
a spacer layer provided between the free layer and the reference layer; and
a pair of electrodes configured to cause a current to flow through the laminated film,wherein a rotation angle of the first magnetization of the free layer in response to a distortion of the substrate is different from a rotation angle of the second magnetization of the reference layer in response to the distortion of the substrate.
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Abstract
A strain sensor element comprises a laminated film which has a magnetic free layer, a spacer layer, and a magnetic reference layer. The free layer has a variable magnetization direction and a out-of-plane magnetization direction. The reference layer has a variable magnetization direction which is pinned more strongly than the magnetization of the free layer. The spacer layer provided between the free layer and the reference layer. A pair of electrodes is provided with a plane of the laminated film. A substrate is provided with either of the pair electrodes and can be strained. The rotation angle of the magnetization of the free layer is different from the rotation angle of the magnetization of the reference layer when the substrate is distorted. Electrical resistance is changed depending on the magnetization angle between the free layer and the reference layer, which allows the element to operate as a strain sensor.
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Citations
21 Claims
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1. A strain sensor element comprising:
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a laminated film provided above a substrate, the laminated film comprising; a free layer which has a perpendicular magnetic anisotropy, wherein the free layer has a first magnetization; a reference layer comprising a second magnetization; and a spacer layer provided between the free layer and the reference layer; and a pair of electrodes configured to cause a current to flow through the laminated film, wherein a rotation angle of the first magnetization of the free layer in response to a distortion of the substrate is different from a rotation angle of the second magnetization of the reference layer in response to the distortion of the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A blood pressure sensor comprising:
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a strain sensor element comprising; a laminated film provided above a substrate, the laminated film comprising; a free layer which has a perpendicular magnetic anisotropy, wherein the free layer has a first magnetization; a reference layer comprising a second magnetization; a spacer layer provided between the free layer and the reference layer; and a pair of electrodes configured to cause a current to flow through the laminated film, wherein a rotation angle of the first magnetization of the free layer in response to a distortion of the substrate is different from a rotation angle of the second magnetization of the reference layer in response to the distortion of the substrate. - View Dependent Claims (18, 19)
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20. A strain sensor element comprising:
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a laminated film provided above a substrate, the laminated film comprising; a free layer which comprises an Mp layer, wherein the free layer has a first magnetization; a reference layer comprising a second magnetization; a spacer layer provided between the free layer and the reference layer; and a pair of electrodes configured to cause a current to flow through the laminated film, wherein a rotation angle of the first magnetization of the free layer in response to a distortion of the substrate is different from a rotation angle of the second magnetization of the reference layer in response to the distortion of the substrate, wherein the Mp layer comprises at least one of; a TbFe layer, a (Co/Ni) multilayer, a (Co/Pd) multilayer, a (Co/Pt) multilayer, a (Co/Ir) multilayer, a FePt layer, a CoPt layer, a CoPt—
SiO2 granular layer, ora CoFeB layer which is thinner than 1 nm.
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21. A blood pressure sensor comprising:
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a strain sensor element comprising; a laminated film provided above a substrate, the laminated film comprising; a free layer which comprises an Mp layer, wherein the free layer has a first magnetization; a reference layer comprising a second magnetization; a spacer layer provided between the free layer and the reference layer; and a pair of electrodes configured to cause a current to flow through the laminated film, wherein a rotation angle of the first magnetization of the free layer in response to a distortion of the substrate is different from a rotation angle of the second magnetization of the reference layer in response to the distortion of the substrate, wherein the Mp layer comprises at least one of; a TbFe layer, a (Co/Ni) multilayer, a (Co/Pd) multilayer, a (Co/Pt) multilayer, a (Co/Ir) multilayer, a FePt layer, a CoPt layer, a CoPt—
SiO2 granular layer, ora CoFeB layer which is thinner than 1 nm.
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Specification