Topologically stable helices in exchange coupled rare-earth/rare-earth multilayer with superspin-glass like ordering

Ye, Jingfan; Paul, Amitesh; Paul, Neelima; Mattauch, Stefan; Baldauf, Thomas

doi:10.1038/s42005-019-0210-0

Journal Article

FZJ-2019-04826

Topologically stable helices in exchange coupled rare-earth/rare-earth multilayer with superspin-glass like ordering

Ye, J. ; Baldauf, T. ; Mattauch, S.MLZ*FZJ* ; Paul, N. ; Paul, A. (Corresponding author)

2019
Springer Nature London

Communications Physics 2(1), 114 (2019) [10.1038/s42005-019-0210-0]

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Please use a persistent id in citations: http://hdl.handle.net/2128/23060 doi:10.1038/s42005-019-0210-0

Abstract: Existence of 2π-planar domain walls (DWs) are often reported for transition metal-rare-earth(TM/RE) layered systems. The magnetization process of such two-dimensional randomlyanisotropical system in the form of 2π-DWs is directly correlated with topologically stablehelices. Here, instead of TM/RE, we have investigated [Dy/Tb]10multilayers involving twodifferent anisotropic layers of rare-earth/rare-earth (RE/RE). Using magnetization and sus-ceptibility as function of temperature along with thermo-remanent magnetization measure-ments we have confirmed superspin-glass type of behavior within this RE/RE system.Additionally, an exchange biasfield up to–0.88 kOe (–88 mT) was also revealed for suchrare-earth based multilayers. Interestingly, using detailed analysis of the polarized neutronreflectometry profiles, wefind evidences of superimposed helical magnetic configurationswithin both materials of Dy and Tb associated with spin-frustrated interfaces. Furthermore,magnetizationfluctuations around the mean magnetization from vertically uncorrelateddomains were observed with polarized off-specular neutron scattering. We believe that coexistence of helical ground states with super spin-glass-like ordering are fundamentally instrumental for topologically stability in RE/RE systems, which in principle, can be exploited in all-spin-based technology.

Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd)

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