Piezostrain control of anomalous Hall resistivity of [Co/Pt]3–Pb(Mg1/3Nb2/3)O3–PbTiO3 heterostructure

The anomalous Hall effect (AHE) in [Co/Pt]3 thin films with perpendicular magnetic anisotropy grown on Pb(Mg1/3Nb2/3)O3–Pb0.7Ti0.3O3 substrates is investigated under application of different electric fields at various temperatures. As the sweeping mode of application of the electric field changes from symmetric bipolar to asymmetric bipolar, the butterfly-like behavior of the resistivity vs electric field curves is converted into loop-like behavior, which is attributed to the piezostrain effect. The anomalous Hall conductivity σAH vs longitudinal conductivity σxx characteristics at the corresponding temperatures indicate two AHE mechanisms, which include the side jump and/or intrinsic mechanisms. In addition, the σAH–σxx curve shows obvious changes under different electric fields, which means that the AHE can be mediated. These results are highly important for further understanding of the mechanism by which the electric field can control the AHE.