A magnetic pressure sensor is provided that includes a semiconductor body with a top side and a back side, a Hall sensor formed on the top side of the semiconductor body, a spacer connected to the semiconductor body, whereby the spacer has a recess in the center, and a membrane covering the recess, whereby the membrane has a first material and has a ferromagnetic substance. The ferromagnetic substance concentrates a magnetic flux density of a source formed outside the ferromagnetic material, and the spacer is formed as a circumferential wall and has a second material and the second material is different from the first material in at least one element.