Magnetic sensor and manufacturing method thereof

This invention discloses a magnetic sensor and manufacturing method thereof. The magnetic sensor includes a plurality of giant magnetoresistance components, each of which includes a free layer, a conductive layer and a fixing layer orderly laminated on the substrate, wherein the fixing layer is formed by orderly laminating a first magnetic layer, a Ru layer, a second magnetic layer and an anti-ferromagnetic layer; a magnetizing heat treatment is carried out to fix the magnetizing direction of the fixing layer. The thickness magnetic moments of the first and second magnetic layers are different from each other; the thickness of the Ru layer is in the range of four to ten. The magnetocaloric treatment is carried out to maintain a anti-parallel state between the first and second magnetic layers. A giant magnetoresistance component is formed by using a plane surface and the others are formed by using corresponding slope on the substrate so as to detect a magnetic field along three axial directions. According to this invention, it is easily to control the magnetizing direction of the fixing layer in the heat treatment.