Patent ID: 8431255

Claim:
A galvanomagnetic device comprising: a non-conductive substrate; a first magnetic layer formed on the non-conductive substrate and has a magnetic anisotropy perpendicular to the surface thereof; a second magnetic layer formed on the first magnetic layer; electrodes which pass a current through the first magnetic layer and the second magnetic layer in a first in-plane direction; and electrodes which detect an anomalous Hall voltage which occurs in a second in-plane direction perpendicular to the direction of the current; wherein the anomalous Hall voltage and/or a magnetization reversal field of the first magnetic layer are configured according to a thickness of the first magnetic layer, a thickness of the second magnetic layer and a saturation magnetization of the second magnetic layer; wherein the thickness of the first magnetic layer is between about 3 nanometers and about 5 nanometers, the thickness of the second magnetic layer is less than about 5 nanometers, and the saturation magnetization of the second magnetic layer is less than about 1000 kiloamperes per meter; and wherein the saturation magnetization of the second magnetic layer is larger than a saturation magnetization of the first layer.