期刊
PHYSICAL REVIEW LETTERS
卷 118, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.147201
关键词
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资金
- Goran Gustafsson Foundation
- Swedish Research Council
- Knut and Alice Wallenberg Foundation (KAW)
- Swedish Foundation for Strategic Research (SSF)
- European Research Council (ERC) under the European Community's Seventh Framework Programme (FP)/ERC [307144]
- FONDECYT (Chile) [1161403, 3150372]
- Centers of excellence
- Basal/CONICYT [FB0807]
We report the observation of a Pt layer thickness dependence on the induced interfacial DzyaloshinskiiMoriya interaction in ultrathin Pt(d(Pt))/CoFeB films. Taking advantage of the large spin-orbit coupling of the heavy metal, the interfacial Dzyaloshinskii-Moriya interaction is quantified by Brillouin light scattering measurements of the frequency nonreciprocity of spin waves in the ferromagnet. The magnitude of the induced Dzyaloshinskii-Moriya coupling is found to saturate to a value of 0.45 mJ/m(2) for Pt thicknesses larger than similar to 2 nm. The experimental results are explained by analytical calculations based on the three-site indirect exchange mechanism that predicts a Dzyaloshinskii-Moriya interaction at the interface between a ferromagnetic thin layer and a heavy metal. Our findings open up a way to control and optimize chiral effects in ferromagnetic thin films through the thickness of the heavy-metal layer.
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