Utilizing spin-polarized scanning tunneling microscopy and spectroscopy, we found coexistence of perpendicularly and in-plane magnetized cobalt nanoscale islands on the Ag(111) surface, and the relationship between the moiré corrugation amplitude and the magnetization direction of the islands; the islands with the stronger moiré corrugation show the perpendicular magnetization, and the ones with the weaker moiré corrugation do the in-plane. Density functional theory calculations reproduce the relationship and explain the differences between the two types of the islands with an fcc stacking fault in the intrinsic hcp stacking of cobalt.PACS numbers:
We report the electrolyte dependence of the transport properties of SrTiO3 electric double layer transistors (EDLTs). Ionic liquids such as 1-ethyl-3-methylimidazolium (EMIM) bis(trifluoromethylsulfonyl)imide (TFSI), EMIM dicyanamide (DCA), N,N-diethyl-N-methyl-N-(2-methoxyethyl) ammonium (DEME) TFSI, and DEME tetrafluoroborate (BF4), and polymer electrolytes such as poly(ethylene oxide) (PEO):CsClO4, were used as the electrolytes. All the devices showed metal–insulator transition with a threshold carrier density of 1 × 1013 cm−2. The maximum carrier density was also limited to below 1.6 × 1014 cm−2 for all the devices. On the other hand, the electron mobility at low temperature varied with the cation of the electrolyte and the gating temperature. The EDLT with the ionic liquid EMIM-DCA, which gated at room temperature, showed the highest mobility of 2,600 cm2 V−1 s−1 at 2 K. The observed electrolyte dependence of the SrTiO3 channel mobility is attributed to the change in the surface scattering rate by the adsorbed cations and spatial homogeneity of the cations in the electrolyte.
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