Dzyaloshinskii-Moriya interaction at an antiferromagnetic interface: First-principles study of Fe/Ir bilayers on Rh(001)

Meyer, S.; Dupé, Bertrand; Ferriani, P.; Heinze, Stefan

doi:10.1103/physrevb.96.094408

Cited by 34 publications

(28 citation statements)

References 73 publications

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“…7). The DMI in our calculations may also be overestimated due to the use of first-order perturbation theory, an effect which has been quantified to about 10–25% depending on the system 38,49 . To obtain a FM ground state in the simulations for hcp-Rh/Co/Ir(111), as in the experiment, we have reduced the calculated DMI by 50%, i.e., just below the critical value where a transition from a spin spiral ground state to a FM state occurs (see Supplementary Table 2 for values).…”

Section: Resultsmentioning

confidence: 80%

Isolated zero field sub-10 nm skyrmions in ultrathin Co films

et al. 2019

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Due to their exceptional topological and dynamical properties magnetic skyrmions—localized stable spin structures—show great promise for spintronic applications. To become technologically competitive, isolated skyrmions with diameters below 10 nm stable at zero magnetic field and at room temperature are desired. Despite finding skyrmions in a wide spectrum of materials, the quest for a material with these envisioned properties is ongoing. Here we report zero field isolated skyrmions at T = 4 K with diameters below 5 nm observed in the virgin ferromagnetic state coexisting with 1 nm thin domain walls in Rh/Co atomic bilayers on Ir(111). These spin structures are investigated by spin-polarized scanning tunneling microscopy and can also be detected using non-spin-polarized tips via the noncollinear magnetoresistance. We demonstrate that sub-10 nm skyrmions are stabilized in these ferromagnetic Co films at zero field due to strong frustration of exchange interaction, together with Dzyaloshinskii–Moriya interaction and large magnetocrystalline anisotropy.

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Section: Resultsmentioning

confidence: 80%

Isolated zero field sub-10 nm skyrmions in ultrathin Co films

et al. 2019

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“…We find that in a 1 Q –2 Q transformation, as present here when going from the 1 Q domains to the 2 Q wall, all terms scale with , see ref. 40 and Supplementary Fig. S4 .…”

Section: Resultsmentioning

confidence: 99%

Discovery and characterization of a new type of domain wall in a row-wise antiferromagnet

et al. 2021

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Antiferromagnets have recently moved into the focus of application-related research, with the perspective to use them in future spintronics devices. At the same time the experimental determination of the detailed spin texture remains challenging. Here we use spin-polarized scanning tunneling microscopy to investigate the spin structure of antiferromagnetic domain walls. Comparison with spin dynamics simulations allows the identification of a new type of domain wall, which is a superposition state of the adjacent domains. We determine the relevant magnetic interactions and derive analytical formulas. Our experiments show a pathway to control the number of domain walls by boundary effects, and demonstrate the possibility to change the position of domain walls by interaction with movable adsorbed atoms. The knowledge about the exact spin structure of the domain walls is crucial for an understanding and theoretical modelling of their properties regarding, for instance, dynamics, response in transport experiments, and manipulation.

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“…The different behavior of Ir as a capping layer and as an inserted layer was recently investigated in Ref. [52].…”

Section: A Isotropic Exchange Interactionsmentioning

confidence: 99%

Magnetism of a Co monolayer on Pt(111) capped by overlayers of 5d elements: A spin-model study

et al. 2018

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Using first-principles calculations, we study the magnetic properties of a Co monolayer on a Pt(111) surface with a capping monolayer of selected 5d elements (Re, Os, Ir, Pt and Au). First we determine the tensorial exchange interactions and magnetic anisotropies characterizing the Co monolayer for all considered systems. We find a close relationship between the magnetic moment of the Co atoms and the nearest-neighbor isotropic exchange interaction, which is attributed to the electronic hybridization between the Co and the capping layers, in spirit of the Stoner picture of ferromagnetism. The Dzyaloshinskii-Moriya interaction is decreased for all overlayers compared to the uncapped Co/Pt(111) system, while even the sign of the Dzyaloshinskii-Moriya interaction changes in case of the Ir overlayer. We conclude that the variation of the Dzyaloshinskii-Moriya interaction is well correlated with the change of the magnetic anisotropy energy and of the orbital moment anisotropy. The unique influence of the Ir overlayer on the Dzyaloshinskii-Moriya interaction is traced by scaling the strength of the spin-orbit coupling of the Ir atoms in Ir/Co/Pt(111) and by changing the Ir concentration in the Au1−xIrx/Co/Pt(111) system. Our spin dynamics simulations indicate that the magnetic ground state of Re/Co/Pt(111) thin film is a spin spiral with a tilted normal vector, while the other systems are ferromagnetic. arXiv:1801.09426v1 [cond-mat.mtrl-sci]

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Dzyaloshinskii-Moriya interaction at an antiferromagnetic interface: First-principles study of Fe/Ir bilayers on Rh(001)

Cited by 34 publications

References 73 publications

Isolated zero field sub-10 nm skyrmions in ultrathin Co films

Isolated zero field sub-10 nm skyrmions in ultrathin Co films

Discovery and characterization of a new type of domain wall in a row-wise antiferromagnet

Magnetism of a Co monolayer on Pt(111) capped by overlayers of 5d elements: A spin-model study

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