Electric field-tailored giant transformation of magnetic anisotropy and interfacial spin coupling in epitaxial γ′-Fe4N/Pb(Mg1/3Nb2/3)0.7Ti0.3O3(011) multiferroic heterostructures

Abstract

Electric-field control of magnetization is imperatively desired in spintronic devices with high speed, low energy exhaust and small size. Herein, electric-field control of magnetization and the ferromagnetic resonance field was achieved in the epitaxial γ′-Fe₄N/PMN-PT [Pb(Mg_1/3Nb_2/3)_0.7Ti_0.3O₃(011)] heterostructures. At an electric field of +10 kV cm⁻¹, remanent magnetization with a change as large as ∼900 emu cm⁻³ was observed, together with a tunable ferromagnetic resonance field of 700 Oe. Moreover, nonvolatile control of magnetic anisotropy was also realized. The magnetoelectric coupling (MEC) achieved in this study can be ascribed to the spin-dependent screening effect. In addition, remarkable negative damping appears in the high-frequency measurement. These results provide a new platform for greatly enhancing the MEC in properly designed FM/FE heterostructures.