Patent ID: 7592805

Claim:
A magnetic detection device comprising: a magneto-resistance layer having a variable electric resistance in accordance with an external magnetic field; and the magneto-resistance layer being connected in series to a reference resistance layer having a fixed electric resistance under the external magnetic field, a voltage is applied to the magneto-resistance layer and the reference resistance layer connected in series to each other, and an output conductive layer that outputs a central potential between the magneto-resistance layer and the reference resistance layer, wherein the output conductive layer extends along at least one of the magneto-resistance layer and the reference resistance layer with a gap therebetween, wherein the output conductive layer is electrically connected to at least one of the magneto-resistance layer and the reference resistance layer via a conductive connection layer, wherein the position of the connection layer is selectable, and wherein the magneto-resistance layer comprises: a fixed magnetic layer of which the magnetization direction is fixed, a free magnetic layer of which the magnetization direction varies with the external magnetic field, and a non-magnetic conductive layer disposed between the fixed magnetic layer and the free magnetic layer, wherein the reference resistance layer has reverse lamination order with the non-magnetic conductive layer and the free magnetic layer in comparison with the magneto-resistance layer.