A method of manufacturing a semiconductor device with precision patterning is disclosed. The power tool head has an output for performing an operation on a work piece, and a housing having an inner surface defining a main cavity for receiving an interface of the power tool handle. A first read line is coupled to a first ferromagnetic layer and a second read line is coupled to a second ferromagnetic layer such that a voltage difference between the two read lines will produce a current flowing perpendicularly through each layer of the MTJ. The plurality of drive transistors includes a primitive group of drive transistors, and the metal layer includes a power buss covering each of the contacts of the primitive group of drive transistors. Such engraved patterns can act as optical servo tracks for maintaining alignment of the recording head with the data tracks on the magnetic tape.