Patent ID: 8913351

Claim:
A magnetoresistance effect element, comprising: a first shield; a second shield; a stacked body including a first magnetic layer provided between the first shield and the second shield, a magnetization of the first magnetic layer being changeable, a second magnetic layer provided between the first magnetic layer and the second shield, a magnetization of the second magnetic layer being changeable, an intermediate layer provided between the first magnetic layer and the second magnetic layer, the intermediate layer being nonmagnetic, a first Ru layer provided between the first shield and the first magnetic layer, a thickness of the first Ru layer being not less than 1.5 nanometers and not more than 2.5 nanometers, and a second Ru layer provided between the second magnetic layer and the second shield, a thickness of the second Ru layer being not less than 1.5 nanometers and not more than 2.5 nanometers; a third magnetic layer provided between the second Ru layer and the second shield, the third magnetic layer contacting the second Ru layer and the second shield, the third magnetic layer including at least one selected from the group consisting of an amorphous magnetic alloy, an FeCr alloy, an FeV alloy, and Fe; and a hard bias unit provided between the first shield and the second shield, a first direction from the first shield toward the second shield intersecting a second direction from the stacked body toward the hard bias unit.