The disclosure provides a novel method and apparatus for inputting addresses to devices to select the device TAP for access. Information is retrieved from different components of the mobile computing device and analyzed for relationships therein. The command unit electrically connects with the calculating unit and the loading unit to receive the torque command signal and produces a control signal by the torque command signal or a velocity signal. An optional tuning layer interposed between the free layer and the top electrode helps to reduce the damping constant of the free layer.