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Magneto-resistive effect device, magnetic head gimbal assembly, magnetic recording/reproduction device, strain sensor, pressure sensor, blood pressure sensor, and structural health monitoring sensor

  • US 9,032,808 B2
  • Filed: 09/27/2011
  • Issued: 05/19/2015
  • Est. Priority Date: 03/24/2011
  • Status: Active Grant
First Claim
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1. A strain sensor comprising:

  • a deformable substrate; and

    a stacked body fixed to the substrate, the stacked body includinga first magnetic layer having a first composition including one or more metals selected from the group consisting of iron, cobalt, and nickel, the first magnetic layer having a first magnetization,a second magnetic layer apart from the first magnetic layer in a first direction, the second magnetic layer having a composition different from the first composition, the second magnetic layer having a second magnetization, anda first spacer layer provided between the first magnetic layer and the second magnetic layer; and

    a pair of electrodes configured to supply current to the stacked body,both of the first magnetization and the second magnetization being configured to change in accordance with an external strain applied to the stacked body, the external strain being generated by a deformation of the substrate to cause a resistance between the pair of electrodes to be changed, andthe external strain being configured to be detected by the change in the resistance.

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