MAGNETO-RESISTIVE EFFECT DEVICE, MAGNETIC HEAD GIMBAL ASSEMBLY, MAGNETIC RECORDING/REPRODUCTION DEVICE, STRAIN SENSOR, PRESSURE SENSOR, BLOOD PRESSURE SENSOR, AND STRUCTURAL HEALTH MONITORING SENSOR
First Claim
1. A magneto-resistive effect device, comprisinga stacked body stacked on a substrate, the stacked body includinga first magnetic layer that includes one or more metals selected from the group consisting of iron, cobalt, and nickel,a second magnetic layer stacked on the first magnetic layer, having a composition that is different from the first magnetic layer, anda spacer layer disposed between the first magnetic layer and the second magnetic layer;
- a pair of first electrodes that feeds current to the stacked body;
a strain introduction member that applies strain to the stacked body, that is provided near the stacked body, and by applying strain to the stacked body, biases magnetization directions of the first magnetic layer and the second magnetic layer in different directions; and
a second electrode for applying a voltage to the strain introduction member, whereinthe magnetization directions of the first magnetic layer and the second magnetic layer are changed by the application of an external magnetic field, andthe external magnetic field is detected by a change in resistance between the first electrodes due to the change in the magnetization directions.
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Accused Products
Abstract
According to one embodiment, a magneto-resistive effect device, includes a stacked body stacked on a substrate, a pair of first electrodes that feeds current to the stacked body, a strain introduction member, and a second electrode for applying a voltage to the strain introduction member. The stacked body includes a first magnetic layer that includes one or more metals selected from the group consisting of iron, cobalt, and nickel, a second magnetic layer stacked on the first magnetic layer, having a composition that is different from the first magnetic layer, and a spacer layer disposed between the first magnetic layer and the second magnetic layer.
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Citations
23 Claims
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1. A magneto-resistive effect device, comprising
a stacked body stacked on a substrate, the stacked body including a first magnetic layer that includes one or more metals selected from the group consisting of iron, cobalt, and nickel, a second magnetic layer stacked on the first magnetic layer, having a composition that is different from the first magnetic layer, and a spacer layer disposed between the first magnetic layer and the second magnetic layer; -
a pair of first electrodes that feeds current to the stacked body; a strain introduction member that applies strain to the stacked body, that is provided near the stacked body, and by applying strain to the stacked body, biases magnetization directions of the first magnetic layer and the second magnetic layer in different directions; and a second electrode for applying a voltage to the strain introduction member, wherein the magnetization directions of the first magnetic layer and the second magnetic layer are changed by the application of an external magnetic field, and the external magnetic field is detected by a change in resistance between the first electrodes due to the change in the magnetization directions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A magnetic head gimbal assembly, comprising:
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a magneto-resistive effect device, wherein, the magneto-resistive effect device includes; a stacked body stacked on a substrate, the stacked body including a first magnetic layer that includes one or more metals selected from the group consisting of iron, cobalt, and nickel, a second magnetic layer stacked on the first magnetic layer, having a composition that is different from the first magnetic layer, and a spacer layer disposed between the first magnetic layer and the second magnetic layer; a pair of first electrodes that feeds current to the stacked body; a strain introduction member that applies strain to the stacked body, that is provided near the stacked body, and by applying strain to the stacked body, biases magnetization directions of the first magnetic layer and the second magnetic layer in different directions; and a second electrode that applies a voltage to the strain introduction member, wherein the magnetization directions of the first magnetic layer and the second magnetic layer are changed by the application of an external magnetic field, and the external magnetic field is detected by a change in resistance between the first electrodes due to the change in the magnetization directions.
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11. A magnetic recording/reproduction device, comprising:
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a magnetic head gimbal assembly that includes a magneto-resistive effect device; a magnetic head that includes the magneto-resistive effect device, mounted on the magnetic head gimbal assembly; and a magnetic recording medium that reproduces information using the magnetic head, wherein the magneto-resistive effect device includes a stacked body stacked on a substrate, the stacked body including; a first magnetic layer that includes one or more metals selected from the group consisting of iron, cobalt, and nickel, a second magnetic layer stacked on the first magnetic layer, having a composition that is different from the first magnetic layer, and a spacer layer disposed between the first magnetic layer and the second magnetic layer; a pair of first electrodes that feeds current to the stacked body; a strain introduction member that applies strain to the stacked body, that is provided near the stacked body, and by applying strain to the stacked body, biases magnetization directions of the first magnetic layer and the second magnetic layer in different directions; and a second electrode that applies a voltage to the strain introduction member, wherein the magnetization directions of the first magnetic layer and the second magnetic layer are changed by the application of an external magnetic field, and the external magnetic field is detected by a change in resistance between the first electrodes due to the change in the magnetization directions.
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12. A strain sensor comprising:
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a substrate; and a stacked body fixed to the substrate, the stacked body including a first magnetic layer that includes one or more metals selected from the group consisting of iron, cobalt, and nickel, a second magnetic layer stacked on the first magnetic layer, having a composition that is different from the first magnetic layer, and a spacer layer disposed between the first magnetic layer and the second magnetic layer; and a pair of electrodes that feeds current to the stacked body, wherein the magnetization of both the first magnetic layer and the second magnetic layer rotates due to external strain applied to the stacked body, and the external strain is detected by a change in the resistance between the electrodes associated with the rotation of the magnetization of the first magnetic layer and the second magnetic layer. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A pressure sensor, comprising:
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a strain sensor, the strain sensor including a substrate that includes a flexible membrane to which a stacked body is fixed, and a support part that supports the membrane; the stacked body fixed to the substrate includes a first magnetic layer that includes one or more metals selected from the group consisting of iron, cobalt, and nickel, a second magnetic layer stacked on the first magnetic layer, having a composition that is different from the first magnetic layer, and a spacer layer disposed between the first magnetic layer and the second magnetic layer, and a pair of electrodes that feeds current to the stacked body;
whereinthe magnetization of both the first magnetic layer and the second magnetic layer rotate due to external strain applied to the stacked body, external strain is detected by a change in the resistance between the electrodes associated with the rotation of the magnetization of the first magnetic layer and the second magnetic layer, and external pressure is detected by detecting strain on the membrane due to external pressure.
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22. A blood pressure sensor that monitors the blood pressure of a person or an animal, comprising:
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a strain sensor, the strain sensor including; a substrate; and a stacked body fixed to the substrate, the stacked body including a first magnetic layer that includes one or more metals selected from the group consisting of iron, cobalt, and nickel, a second magnetic layer stacked on the first magnetic layer, having a composition that is different from the first magnetic layer, and a spacer layer disposed between the first magnetic layer and the second magnetic layer; and a pair of electrodes that feeds current to the stacked body, wherein the magnetization of both the first magnetic layer and the second magnetic layer rotates due to external strain applied to the stacked body, and external strain is detected by a change in the resistance between the electrodes associated with the rotation of the magnetization of the first magnetic layer and the second magnetic layer.
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23. A structural health monitoring sensor that performs structural condition monitoring to monitor a strain state of a bridge or building structure, comprising:
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a strain sensor, the strain sensor including a substrate; and a stacked body fixed to the substrate, the stacked body including a first magnetic layer that includes one or more metals selected from the group consisting of iron, cobalt, and nickel, a second magnetic layer stacked on the first magnetic layer, having a composition that is different from the first magnetic layer, and a spacer layer disposed between the first magnetic layer and the second magnetic layer; and a pair of electrodes that pass current through the stacked body, wherein the magnetization of both the first magnetic layer and the second magnetic layer rotate due to external strain applied to the stacked body, and external strain is detected by a change in the resistance between the electrodes associated with the rotation of the magnetization of the first magnetic layer and the second magnetic layer.
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Specification