Unusual resonant response in [Fe(001)/Cr(001)]$_{10 }$/ MgO(001) magnetic multilayers in magnetic field

We report on experimental observation of unusual electromotive resonances in [Fe/Cr]$_{10}$ multilayers epitaxially grown on MgO(001) substrates and measured by using balanced excitation and detection schemes. Electric voltage resonances with quality factor exceeding 10$^{3}$ induce strong enhancement of Hall resistance for specific frequencies. Surprisingly, the continuum mechanics model for suspended Fe/Cr layers accounts well for the observed phenomena. Cross-sectional electron microscopy analysis of the multilayers confirms that we could be dealing with non-suspended nanoelectromechanical system.