Magneto-mechanical marker with enhanced frequency stability and signal strength

A magneto mechanical resonator device comprises a plurality of ferromagnetic elements disposed in a stacked arrangement, each ferromagnetic element having a first lengthwise end and a second lengthwise end. A first bias magnetic element is disposed adjacent to the first lengthwise end of the stacked arrangement and a second bias magnetic element is disposed adjacent to the second lengthwise ends of the stacked arrangement. A clamping element is disposed in a central lengthwise region of the stacked arrangement to restrict the vertical displacement of the plurality of ferromagnetic elements with respect to each other at the central lengthwise region, wherein the first and second ends experience flaring movement.