Patent ID: 10355202

Abstract:
A magnetoresistance effect element configured to produce magnetoresistance (MR) ratio higher than that of tunnel magneto resistance (TMR) element using tunnel barrier in the related art under a high bias voltage is provided. A magnetoresistance effect element which includes a laminate in which: an underlayer; a first ferromagnetic metal layer; tunnel barrier layer; and second ferromagnetic metal layer are laminated in this order, wherein the underlayer is made of VN, TaN, or mixed crystals thereof, and the tunnel barrier layer is made of compound which has a spinel structure in which the arrangement of cations is disordered and is represented by the following composition formula (1) is provided: (1) AxB2Oy, where A represents divalent cations of two or more types of non-magnetic element, B represents an aluminum ion, x represents number which satisfies 0<x≤2, and y represents a number which satisfies 0<y≤4.