Probing of the interfacial Heisenberg and Dzyaloshinskii–Moriya exchange interaction by magnon spectroscopy

Zakeri, Khalil

doi:10.1088/0953-8984/29/1/013001

Cited by 20 publications

(21 citation statements)

References 114 publications

(286 reference statements)

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“…The direct measurement of the IDMI was performed by BLS spectroscopy based on the IDMI-driven asymmetric dispersion shift of long-wavelength thermal spin waves in Damon-Eshbach surface mode 42,43 . The effective IDMI energy density (D eff ) was determined from the direct measurements of the frequency shift (Δf) between Stokes and anti-Stokes spin-wave propagation regimes, f s , and f as , respectively:…”

Section: Resultsmentioning

confidence: 99%

Enhancement of perpendicular magnetic anisotropy and Dzyaloshinskii–Moriya interaction in thin ferromagnetic films by atomic-scale modulation of interfaces

et al. 2020

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To stabilize nontrivial spin textures, e.g., skyrmions or chiral domain walls in ultrathin magnetic films, an additional degree of freedom, such as the interfacial Dzyaloshinskii-Moriya interaction (IDMI), must be induced by the strong spin-orbit coupling (SOC) of a stacked heavy metal layer. However, advanced approaches to simultaneously control the IDMI and perpendicular magnetic anisotropy (PMA) are needed for future spin-orbitronic device implementations. Here, we show the effect of atomic-scale surface modulation on the magnetic properties and IDMI in ultrathin films composed of 5d heavy metal/ferromagnet/4d(5d) heavy metal or oxide interfaces, such as Pt/CoFeSiB/Ru, Pt/CoFeSiB/ Ta, and Pt/CoFeSiB/MgO. The maximum IDMI value corresponds to the correlated roughness of the bottom and top interfaces of the ferromagnetic layer. The proposed approach for significant enhancement of PMA and the IDMI through interface roughness engineering at the atomic scale offers a powerful tool for the development of spinorbitronic devices with precise and reliable controllability of their functionality.

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Section: Resultsmentioning

confidence: 99%

Enhancement of perpendicular magnetic anisotropy and Dzyaloshinskii–Moriya interaction in thin ferromagnetic films by atomic-scale modulation of interfaces

et al. 2020

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“…For Fe/Ir(001) strong DMI has also been reported 45,46 and the possible formation of an atomic spin lattice due to higher-order exchange interaction has been suggested 46 . Antiferromagnetic exchange interactions at the interfaces of thin Fe films and multilayers on Ir(001) have also been observed experimentally [47][48][49] . However, the Ir(001) surface exhibits a (5 × 1) reconstruction which makes the preparation of a pseudomorphic Fe monolayer on Ir(001) difficult [50][51][52] .…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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We study the magnetic interactions in atomic layers of Fe and 5d transition-metals such as Os, Ir, and Pt on the (001) surface of Rh using first-principles calculations based on density functional theory. For both stackings of the 5d-Fe bilayer on Rh(001) we observe a transition from an antiferromagnetic to a ferromagnetic nearest-neighbor exchange interaction upon 5d band filling. In the sandwich structure 5d/Fe/Rh(001) the nearest neighbor exchange is significantly reduced. For FeIr bilayers on Rh(001) we consider spin spiral states in order to determine exchange constants beyond nearest neighbors. By including spin-orbit coupling we obtain the Dzyaloshinskii-Moriya interaction (DMI). The magnetic interactions in Fe/Ir/Rh(001) are similar to those of Fe/Ir(001) for which an atomic scale spin lattice has been predicted. However, small deviations between both systems remain due to the different lattice constants and the Rh vs. Ir surface layers. This leads to slightly different exchange constants and DMI and the easy magnetization direction switches from out-of-plane for Fe/Ir(001) to in-plane for Fe/Ir/Rh(001). Therefore a fine tuning of magnetic interactions is possible by using single 5d transition-metal layers which may allow to tailor antiferromagnetic skyrmions in this type of ultrathin films. In the sandwich structure Ir/Fe/Rh(001) we find a strong exchange frustration due to strong hybridization of the Fe layer with both Ir and Rh which drastically reduces the nearest-neighbor exchange. The energy contribution from the DMI becomes extremely large and DMI beyond nearest neighbors cannot be neglected. We attribute the large DMI to the low coordination of the Ir layer at the surface. We demonstrate that higherorder exchange interactions are significant in both systems which may be crucial for the magnetic ground state.

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“…In Fig. 4, we compare entropies of entanglement for an antiferromagnet with a simple cubic crystal structure, where the Hamiltonian is effectively described by nearest neighbor Heisenberg exchange as well as DM interaction with typical ratio D/J ≈ 30% [19][20][21]. It can be seen that from (a, b) modes to (α, β) modes the Heisenberg contribution to entanglement decreases while the DM-induced magnon CV entanglement increases.…”

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confidence: 99%

Hierarchy of magnon mode entanglement in antiferromagnets

et al. 2020

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Probing of the interfacial Heisenberg and Dzyaloshinskii–Moriya exchange interaction by magnon spectroscopy

Cited by 20 publications

References 114 publications

Enhancement of perpendicular magnetic anisotropy and Dzyaloshinskii–Moriya interaction in thin ferromagnetic films by atomic-scale modulation of interfaces

Enhancement of perpendicular magnetic anisotropy and Dzyaloshinskii–Moriya interaction in thin ferromagnetic films by atomic-scale modulation of interfaces

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

Hierarchy of magnon mode entanglement in antiferromagnets

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