Titled: CHIRAL PHONON MEDIATED INTERLAYER EXCHANGE INTERACTIONIN SrRuO3SUPERLATTICES
Abstract: Artificial oxide crystals synthesized by atomic-scale precisionepitaxyserves asaprototypical platform forrealizing, controlling,and understanding the intriguingcoupling between different degrees of freedom with similar energy scale. In turn,the so-called “Designer Crystals”enableobservationand controlofexotic functional phenomena,that are unattainable in natural crystals.In this talk, we demonstrate an unexpectedspiral spin statein synthetic SrRuO3heterostructure, in which the atomically thin ferromagnetic SrRuO3layers are separatedby the nonmagnetic SrTiO3layers. The spin state of each SrRuO3layer (with a few atomic unit cell thicknesses) within the SrRuO3/SrTiO3superlattices wascharacterized using polarized neutron reflectivity(PNR). Exploiting the superlattice structurewith the help of magnetization measurements, we provethe in-plane spin rotationin the SrRuO3layers as a function oftheSrTiO3layerthickness.The spiral spin structurerealized in the SrRuO3designer crystal envisionsnovel exchange interaction, based on chiral symmetry breaking of phononswithin the SrRuO3layer.The strong chiral phonon-spincoupling observed in the SrRuO3heterostructures might further lead tonovel magnetic devicesutilizing the functional oxide interfaces.
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