Equilibrium faceting formation in vicinal Al2O3 (0001) surface caused by annealing

Verre, Ruggero; Sofin, R. G. S.; Усов, В.; Fleischer, K.; Fox, Daniel; Behan, G.; Zhang, Hongzhou; Shvets, I. V.

doi:10.1016/j.susc.2012.07.024

Cited by 23 publications

(21 citation statements)

References 26 publications

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“…• C in atmosphere for 16 h. 37,38 AFM analysis confirmed the texturing of the template with a measured periodicity L y = 130 nm. The sample was then loaded in a ultrahigh vacuum chamber (base pressure 2 × 10 −8 mbar) and Ag was deposited at a glancing angle of 6…”

Section: Experimental Methodsmentioning

confidence: 60%

General approach to the analysis of plasmonic structures using spectroscopic ellipsometry

et al. 2013

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In this article a route to analyze the full optical response of plasmonic structures is developed. First, the simple case of an anisotropic thin plasmonic layer supported on a transparent substrate is analyzed by introducing a quantity named anisotropic surface excess function (ASEF). The spectral features are analyzed in terms of effective dielectric function, demonstrating a more direct relation with the plasmonic response of the layer. The formalism is then generalized using a transfer matrix method. The formalism developed is supported by experimental evidence obtained by measuring the response of anisotropic nanoparticle arrays grown at a glancing angle. The agreement between theory and experiment is clear, suggesting that SE can be conveniently employed to measure the spectroscopic response of plasmonic structures. It is also demonstrated that the figure of merit of the plasmonic resonance for refractive index sensing can be greatly improved, with optimized measurement configurations, using polarized spectroscopy.

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Section: Experimental Methodsmentioning

confidence: 60%

General approach to the analysis of plasmonic structures using spectroscopic ellipsometry

et al. 2013

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“…(0001) Al 2 O 3 surface morphology is well known to strongly depend on preparation procedure e.g. cleaning methods, annealing time [23,24] and temperature [23][24][25][26], and atmosphere [27] Pt film structure and its surface roughness are also extremely sensitive to heat treatment and even small deviations from specific temperature may result in different growth mode. As it was reported before [18][19][20] by manipulating the substrate temperature during deposition or post-annealing time and temperature one may engineer Pt films of different structure.…”

Section: Substrate Preparation and Sample Growthmentioning

confidence: 99%

Structural and Magnetic Properties of MBE Grown (Fe/Pt) (111) Multilayers

et al. 2016

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Series of Al2O3(0001)/Pt/(Fe/Pt)n/Pt multilayers with variable number of bilayers n and thicknesses of individual layers were grown using molecular beam epitaxy to investigate influence of buffer layer structure, number of bilayers, and individual layer thickness on their structural and magnetic properties. Both columnar and monocrystalline 10 nm Pt (111) buffer layers were used in the experiment. Structure of Pt buffer layer determined the roughness of Fe/Pt interfaces and consequently magnetic properties of the multilayers. When multilayers were deposited on columnar Pt buffer layer, we observed increase of Fe/Pt interfaces roughness with increasing number of bilayers to values exceeding the nominal Fe/Pt bilayer thickness in the upper part of the sample volume, which resulted in the increment of coercivity in the sample with n = 15 determined from hysteresis loops measured for perpendicular orientation of magnetic field. When Fe/Pt multilayers were deposited on monocrystalline Pt buffer layer, Fe/Pt interfaces were smooth regardless the number of bilayers. All samples, despite of the quality of buffer layer, number of bilayers, and individual layer thickness revealed easy magnetisation axis oriented in the sample plane.

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“…[29][30][31] The surface morphology of the SrTiO 3 vicinal substrates was examined with an Asylum Research MFP-3D AFM. To produce uniform and straight steps, the SrTiO 3 vicinal substrates were chemically cleaned and then annealed in air in a high temperature furnace at 1130°C for 3 hours.…”

Section: Sample Preparation and Characterizationmentioning

confidence: 99%

“…26 As RS in Fe 3 O 4 can only be observed below the Verwey transition temperature and the switching field is 2 orders of magnitude lower than that for the Zener breakdown (10 6 V cm −1 ), it is believed that RS in Fe 3 O 4 is related to spin-charge ordering or the strongly correlated effect and it is explained by an effect analogous to an electrical-field-driven metal-insulator transition. See DOI: 10 29 may offer an interesting platform to do this. A recent experiment has shown that an electrical field can slightly shift the Verwey temperature T v but does not disrupt the Verwey transition itself.…”

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Electrical-field-driven metal–insulator transition tuned with self-aligned atomic defects

Syrlybekov

Mauit

et al. 2015

Nanoscale

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Recently, significant attention has been paid to the resistance switching (RS) behaviour in Fe3O4 and it was explained through the analogy of the electrically driven metal-insulator transition based on the quantum tunneling theory. Here, we propose a method to experimentally support this explanation and provide a way to tune the critical switching parameter by introducing self-aligned localized impurities through the growth of Fe3O4 thin films on stepped SrTiO3 substrates. Anisotropic behavior in the RS was observed, where a lower switching voltage in the range of 10(4) V cm(-1) is required to switch Fe3O4 from a high conducting state to a low conducting state when the electrical field is applied along the steps. The anisotropic RS behavior is attributed to a high density array of anti-phase boundaries (APBs) formed at the step edges and thus are aligned along the same direction in the film which act as a train of hotspot forming conduits for resonant tunneling. Our experimental studies open an interesting window to tune the electrical-field-driven metal-insulator transition in strongly correlated systems.

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Equilibrium faceting formation in vicinal Al2O3 (0001) surface caused by annealing

Cited by 23 publications

References 26 publications

General approach to the analysis of plasmonic structures using spectroscopic ellipsometry

General approach to the analysis of plasmonic structures using spectroscopic ellipsometry

Structural and Magnetic Properties of MBE Grown (Fe/Pt) (111) Multilayers

Electrical-field-driven metal–insulator transition tuned with self-aligned atomic defects

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