Abstract

We proposed a new sensitive giant magnetoresistive sensor consisting of a multilayered structure including a spin-valve element and an AC bias current line. Micro patterned spin-valve film exhibits a step-shape MR loop, in which free layer magnetization switches like a single domain. High sensitivity is attained utilizing only the edge of this MR loop. The magnetic field induced by the bias current was set to be slightly smaller than the rising field of the MR loop. The sensor detected an external field change of 0.5 Oe, and operated using a bias current having a pulse width of 30 ns.

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