Voltage-Controlled Reconfigurable Magnonic Crystal at the Sub-micrometer Scale
Résumé
Multiferroics offer an elegant means to implement voltage-control and on the fly reconfigurability in microscopic, nanoscaled systems based on ferromagnetic materials. These properties are particularly interesting for the field of magnonics, where spin waves are used to perform advanced logical or analogue functions. Recently, the emergence of nano-magnonics is expected to eventually lead to the large-scale integration of magnonic devices. However, a compact voltage-controlled, on demand reconfigurable magnonic system has yet to be shown. Here, we introduce the combination of multiferroics with ferromagnets in a fully epitaxial heterostructure to achieve such voltagecontrolled and reconfigurable magnonic systems. Imprinting a remnant electrical polarization in thin multiferroic BiFeO 3 with a periodicity of 500 nm yields a modulation of the effective magnetic field in the micron-scale, ferromagnetic La 2/3 Sr 1/3 MnO 3 magnonic waveguide. We evidence the magneto-electrical coupling by characterizing the spin wave propagation spectrum in this artificial, voltage induced, magnonic crystal and demonstrate the occurrence of a robust magnonic bandgap with > 20 dB rejection.
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