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Abstract

A magnetoresistance effect device includes a magnetoresistance effect element, and an external magnetic field application unit for applying an external magnetic field to the magnetoresistance effect element. The magnetoresistance effect element includes a first ferromagnetic layer, a second ferromagnetic layer, and a spacer layer. The external magnetic field application unit includes a magnetization retention section and a magnetization setting section. The magnetization setting section has a function of setting a magnetization to be used to generate the external magnetic field into the magnetization retention section by applying a magnetization-setting magnetic field to the magnetization retention section and then stopping the application of the magnetization-setting magnetic field. The magnetization retention section has a function of retaining the set magnetization after the application of the magnetization-setting magnetic field is stopped.

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First Claim