Dzyaloshinskii–Moriya interaction(DMI)is considered as one of the most important energies for specific chiral textures such as magnetic skyrmions.The keys of generating DMI are the absence of structural inversion sym...Dzyaloshinskii–Moriya interaction(DMI)is considered as one of the most important energies for specific chiral textures such as magnetic skyrmions.The keys of generating DMI are the absence of structural inversion symmetry and exchange energy with spin–orbit coupling.Therefore,a vast majority of research activities about DMI are mainly limited to heavy metal/ferromagnet bilayer systems,only focusing on their interfaces.Here,we report an asymmetric band formation in a superlattices(SL)which arises from inversion symmetry breaking in stacking order of atomic layers,implying the role of bulk-like contribution.Such bulk DMI is more than 300%larger than simple sum of interfacial contribution.Moreover,the asymmetric band is largely affected by strong spin–orbit coupling,showing crucial role of a heavy metal even in the non-interfacial origin of DMI.Our work provides more degrees of freedom to design chiral magnets for spintronics applications.展开更多
基金Authors gratefully acknowledge prof.Se Kwon Kim for the fruitful discussion.Financial support from the Japan Society for the Promotion of Science(JSPS)KAKENHI Grant No.15H05702 is gratefully acknowledgedT.O.was supported by the Collaborative Research Program of the Institute for Chemical Research,Kyoto University+1 种基金S.K.was supported by the Basic Research Laboratory Program through the National Research Foundation of Korea(NRF)funded by the MSIT(NRF-2018R1A4A1020696,NRF-2019R1C1C1010345)A.-M.P.is also supported by Institut Teknologi Bandung through P3MI-ITB 2020 research grant.Computations were performed at Research Institute for Information Technology,Kyushu University.
文摘Dzyaloshinskii–Moriya interaction(DMI)is considered as one of the most important energies for specific chiral textures such as magnetic skyrmions.The keys of generating DMI are the absence of structural inversion symmetry and exchange energy with spin–orbit coupling.Therefore,a vast majority of research activities about DMI are mainly limited to heavy metal/ferromagnet bilayer systems,only focusing on their interfaces.Here,we report an asymmetric band formation in a superlattices(SL)which arises from inversion symmetry breaking in stacking order of atomic layers,implying the role of bulk-like contribution.Such bulk DMI is more than 300%larger than simple sum of interfacial contribution.Moreover,the asymmetric band is largely affected by strong spin–orbit coupling,showing crucial role of a heavy metal even in the non-interfacial origin of DMI.Our work provides more degrees of freedom to design chiral magnets for spintronics applications.
