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- W4366998258 abstract "Abstract We report on the optical characterization of non-magnetic metal (NM)/ferromagnetic (Co 20 Fe 60 B 20 )/MgO heterostructures and interfaces by using mid infrared (MIR) spectroscopic ellipsometry at room temperature. We extracted for the MIR range the dielectric function (DF) of Co 20 Fe 60 B 20 , that is lacking in literature, from a multisample analysis. From the optical modeling of the heterostructures we detected and determined the dielectric tensor properties of a two-dimensional electron gas (2DEG) forming at the NM and the CoFeB interface. These properties comprise independent Drude parameters for the in-plane and out-of plane tensor components, with the latter having an epsilon-near-zero frequency within our working spectral range. A feature assigned to spin–orbit coupling (SOC) is identified. Furthermore, it is found that both, the interfacial properties, 2DEG Drude parameters and SOC strength, and the apparent DF of the MgO layer depend on the type of the underlying NM, namely, Pt, W, or Cu. The results reported here should be useful in tailoring novel phenomena in such types of heterostructures by assessing their optical response noninvasively, complementing existing characterization tools such as angle-resolved photoemission spectroscopy, and those related to electron/spin transport." @default.
- W4366998258 created "2023-04-27" @default.
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- W4366998258 date "2023-05-09" @default.
- W4366998258 modified "2023-10-18" @default.
- W4366998258 title "Mid-infrared optical properties of non-magnetic-metal/CoFeB/MgO heterostructures" @default.
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- W4366998258 doi "https://doi.org/10.1088/1361-6463/acd00f" @default.
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