Magnetic arrays and their resonant frequencies for the production of binary codes

An array of cantilevers of varying lengths containing at least a layer of magnetic material has been fabricated to produce oscillations at the resonant frequencies of the cantilevers via magnetomechanical coupling. The acoustic or magnetic fields resulting from the oscillations were detected using microphones or detection coils. The presence or absence of an oscillation at a given frequency of a preselected set of frequencies was used to represent a "1" or a "0," respectively, to create a binary code. The array can be designed and assembled to serve as a multibit magnetic tag. ©1998 IEEE.