Dresden 2020 – scientific programme
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DS: Fachverband Dünne Schichten
DS 44: Magnetic Coupling and Anisotropy in Thin Films (joint session MA/DS)
DS 44.12: Talk
Friday, March 20, 2020, 12:30–12:45, HSZ 04
Artificial bulk metamaterials based on graded epitaxial Co-alloy films — •Lorenzo Fallarino, Mikel Quintana, Ramon Weber, and Andreas Berger — CIC nanoGUNE, 20018 Donostia-San Sebastian, Basque Country, Spain
A very promising alternative to traditional magnetic information storage is based upon encoding information via non-collinear magnetic textures. They occur in certain materials with structure inversion asymmetry, a property that in conjunction with spin-orbit coupling leads to the Dzyaloshinskii-Moriya interaction (DMI). At interfaces between magnetic layers and heavy metals the DMI can be strong enough to promote non-collinear spin textures as ground states [1]. However, any real multilayer is prone to growth induced imperfections at each interface that can strongly affect the energetic landscape. Likewise, interfaces are the only portions that can be influenced in such multilayers, inherently limiting the total active contributions to a small fraction of an entire structure. Along these lines, we have devised an innovative approach by means of artificial bulk metamaterials Co1−xAx (with A = Ru, Pt, Cr) exhibiting pre-defined graded composition structures, allowing for an expansion of DMI generating interfaces into the entirety of the material, thus enabling all-interface-bulk metamaterial. [1] A. Fert, N. Reyren, and V. Cros, Nat. Rev. Mat. 2, 17031 (2017).