The present invention relates to magnetoelastic resonators, sensors, and tunable devices, as well as methods for making such components. The resonators can be used as tags and/or sensors. In general, the resonators include one or more micron-sized resonator portions affixed on a substrate. For use as a tag, each tag includes a plurality of resonator portions that allow for multiplexed coding, and methods for making tags and arrays of such tags include use of electrodeposition processes. In particular embodiments, these components include an electrodeposited material that exhibits magnetostrictive properties.