Interfacial Dzyaloshinskii-Moriya interaction in perpendicularly magnetized Pt/Co/AlO x ultrathin films measured by Brillouin light spectroscopy

By M. Belmeguenai, J. Adam, Y. Roussign'e, S. Eimer, T. Devolder, Joo-Von Kim, S. Chérif, A. Stashkevich, A. Thiaville. 2015

273 citations recorded by the source corpus.

Spin waves in perpendicularly magnetized ${\text{Pt/Co/AlO}}_{x}/\text{Pt}$ ultrathin films with varying Co thicknesses (0.6--1.2 nm) have been studied with Brillouin light spectroscopy in the Damon-Eshbach geometry. The measurements reveal a pronounced nonreciprocal propagation, which increases with decreasing Co thickness. This nonreciprocity, attributed to an interfacial Dzyaloshinskii-Moriya interaction (DMI), is significantly stronger than asymmetries resulting from surface anisotropies for such modes. Results are consistent with an interfacial DMI constant ${D}_{\mathrm{s}}=\ensuremath{-}1.7\ifmmode\pm\else\textpm\fi{}0.11\phantom{\rule{0.28em}{0ex}}\text{pJ}$/m, which favors left-handed chiral spin structures. This suggests that such films below 1 nm in thickness should support chiral states such as skyrmions at room temperature.

Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/3bdaf14ff959f796288e522a0d48b35f198963a4

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In Atomic and Molecular Physics, and Optics

1. Pietro Gambardella
2. M. Chshiev
3. T. Jungwirth
4. J. Sinova
5. A. Manchon
6. I. Miron
7. Kevin Garello
8. A. Thiaville

In Condensed Matter Physics

1. M. Chshiev
2. J. Sinova
3. T. Jungwirth
4. Pietro Gambardella
5. I. Miron
6. Kevin Garello
7. J. Železný
8. Gilles Gaudin

In Electrical and Electronic Engineering

1. J. Sinova
2. A. Manchon
3. T. Jungwirth
4. M. Chshiev
5. A. Thiaville
6. Kevin Garello
7. Pietro Gambardella
8. I. Miron

Citations in the corpus

• Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems (2018, background): “In this picture, the Pt/Co interface stands out with one of the largest interfacial DMI constant Ds ≈ −1.7 pJ/m (Belmeguenai et al., 2015).”
• Room-temperature chiral magnetic skyrmions in ultrathin magnetic nanostructures. (2016, methodology): “As D is expected to be inversely proportional to the film thickness t [43], one can define a related interfacial DM parameter Ds such that D = Ds/t and we find a value Ds = 2.”