Journal
PHYSICAL REVIEW B
Volume 91, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.180405
Keywords
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Funding
- Agence Nationale de la Recherche [ANR-11-BS10-0003, ANR-14-CE26-0012]
- Conseil Regional, Ile-de-France through the DIM C'Nano (IMADYN project)
- Agence Nationale de la Recherche (ANR) [ANR-11-BS10-0003] Funding Source: Agence Nationale de la Recherche (ANR)
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Spin waves in perpendicularly magnetized Pt/Co/AlOx/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-s = -1.7 +/- 0.11 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.
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