Reciprocal-space-resolved piezoelectric control of non-volatile magnetism in epitaxial LiFe₅O₈ film on Pb(Mg_1/3Nb_2/3)_0.7Ti_0.3O₃ substrate

We achieve strong electric field control of non-volatile magnetism of epitaxial LiFe₅O₈ (LFO) films grown on a (001) piezoelectric Pb(Mg_1/3Nb_2/3)_0.7Ti_0.3O₃ (PMN-PT) substrate, as confirmed by the ferromagnetic resonance measurement. The relationship between the resonance field and the applied electric field for the LFO/PMN-PT heterostructure exhibited a hysteresis-loop-like shape, where the difference in the resonance field between the positive and negative remnant polarization states was up to 250 Oe. A reciprocal space mapping study of the piezoelectric control of magnetism, which originated from changes in the microstructure, was conducted to understand the non-volatile magnetic responses to ferroelastic domain switching. The findings indicate that applying an electric field to the LFO/PMN-PT heterostructure is an effective way to tailor the magnetic properties of the LFO film, making it a competitive candidate for high-frequency and high-temperature applications in tunable microwave antennas and filters.