A patient support apparatus includes a frame having a patient support deck that is movable between a horizontal position to support a patient in a lying position and a chair egress position to support the patient in a sitting position. The magneto resistive element has a width within a range from 10 nm to 1 m as measured in a direction perpendicular to a longitudinal direction of the cantilever and in a direction in which the cantilever can be deflected. The source region is formed at one end of each of the fins and the drain region is formed at an opposite end of each of the fins.