Electric field control of non-volatile dynamic magnetic properties of [NiFe/FeMn]N multilayers grown onto PMN-PT substrates

Abstract

Magnetoelectric coupling between ferroelectric (FE) and ferromagnetic (FM) orders in artificial multiferroic materials can realize regulation of magnetic properties by electric field due to stress transmission. Many studies have shown that the electric field controls magnetization flip. However, previous studies mainly considered measuring dynamic magnetic properties when adding an electric field. This paper fabricated [NiFe/FeMn]N exchange bias multilayer films on 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 (PMN-PT) substrates to control nonvolatile dynamic magnetic properties by electric field. The result showed that the FE heterogeneity due to the exchange biased multilayer film introduced a nonvolatile control in the zero electric field state. Although regulation of static magnetic properties is not significant, dynamic magnetic properties change greatly. The resonance frequency remained almost unchanged for NiFe/FeMn bilayers, but the resonance frequency of the top FM layer improved from approximately 4.15 to 5 GHz for [NiFe/FeMn]2 and [NiFe/FeMn]3 films, measured in the zero electric field state, whereas the bottom FM layer retained almost constant value.