Semiconductor devices containing a MOSFET and an on-chip current sensor in the form of a magnetic resistive element are described. Generally, a diffuser portion is combined with an attenuation portion. Each set of the strut members is longitudinally displaced from each other and connected to each other by longitudinally extending links. The Mn content of the other antiferromagnetic films not in contact with the reference layer of the spin-valve sensor is reduced in order to maximize the thermal stability and corrosion resistance of the spin-valve sensor for robust sensor operation at high temperatures in disk drive environments. Advantageously according to the invention, the method further comprises the steps of: acidifying the blood flow with transformation of the related blood bicarbonate content into gaseous carbon dioxide; and eliminating the gaseous carbon dioxide content by means of a pressure gradient.