Dataset of "KNbO3-based multiferroic heterostructures: a lead-free alternative for strain-driven magnetic modulations"

Figure 1: (a) Temperature-dependent structural phase diagram of KNO crystals, (b) wide 2θ-ω scan of pristine KNO (100) in its orthorhombic phase, (c, d) Schematic representation of KNO/Ni (c) and KNO/LSMO (d) heterostructures; below them, the thermal treatments of the two systems are shown.

Figure 2:  XRD 2D-RSMs of the (400) Bragg peak of KNO (100) single crystal after thermal treatments: a) in pristine state; (b) KNO/Ni after heating to C phase; (c) KNO/LSMO after deposition at 1000 K (i.e., heating to C phase); (d) KNO/Ni after cooling to R phase; (e) KNO/LSMO, which passed through O/C/O transition, after cooling to R phase.

Figure 3: Angular dependent room temperature MOKE measurements of KNO/Ni heterostructure (a) as deposited (pristine KNO); (b) after heating up to the cubic phase (O->C->O); (c) after cooling down to the rhombohedral phase (0->R->O). Angular dependence of (d) coercive field (HC) and (e) remanence (Mrem/Msat) in the above cases.

Figure 4: Temperature dependent MOKE hysteresis loops (a-b) and coercivity vs temperature curves (c-d) for KNO/Ni and KNO/LSMO heterostructures, respectively along [001] direction showing the phase transition of KNO from Rhombohedral (R) to Orthorhombic (O).

Figure 5: (a) Wavelength dependent photocurrent measurements and corresponding photon energies; (b) Photocurrent measured as a function of time comparing KNO (100) and PMN-0.4PT (001) responses under 405 nm continuous laser illumination at 800 mW cm−2 power.