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Discovery of strong bulk Dzyaloshinskii-Moriya interaction in composition-uniform centrosymmetric magnetic single layers

查看全文 作　　者：Lijun [1,2]Zhu;David [3]Lujan;Xiaoqin [3]Li 高影响力作者 机构地区：[1]State Key Laboratory of Superlattices and Microstructures,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China;[2]College of Materials Science and Opto-Electronic Technology,University of Chinese Academy of Sciences,Beijing 100049,China;[3]Department of Physics,Center for Complex Quantum Systems,University of Texas at Austin,Austin 78712,USA高影响力机构 出　　处：《Science China(Physics,Mechanics & Astronomy)》索引2024年第67卷第2期,共7页高影响力期刊 基　　金：supported by the National Key Research and Development Program of China(Grant No.2022YFA1204004);the National Natural Science Foundation of China(Grant No.12274405);the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB44000000);primarily supported by the Center for Dynamics and Control of Materials:an NSF MRSEC under Cooperative Agreement No.DMR1720595。 摘　　要：Dzyaloshinskii-Moriya interaction(DMI)is the key ingredient of chiral spintronic phenomena and the emerging technologies based on such phenomena.A nonzero DMI usually occurs at magnetic interfaces or within non-centrosymmetric single crystals.Here,we report the observation of a strong unexpected DMI within a centrosymmetric polycrystalline ferromagnet that has neither a crystal inversion symmetry breaking nor a composition gradient.This DMI is a bulk effect,increases with the thickness of the magnetic layer,and is insensitive to the symmetry of the interfaces or the neighboring materials.We observe a total DMI strength that is a factor of>2 greater than the highest interfacial DMI in the literature.This DMI most likely arises from the strong spin-orbit coupling,strong orbital hybrization,and a“hidden”long-range asymmetry in the material.Our discovery of the strong unconventional bulk DMI in centrosymmetric,composition-uniform magnetic single layers provides fundamental building blocks for the emerging field of spintronics and will stimulate the exploitation of unconventional spin-orbit phenomena in a wide range of materials. 关 键 词：Brillouin light scattering Dzyaloshinskii-Moriya interaction spin wave
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