RBS/Channeling characterization of Ru(0001) and thin epitaxial Ru/Al<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e354" altimg="si44.svg"><mml:msub><mml:mrow/><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:math>O<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e362" altimg="si45.svg"><mml:msub><mml:mrow/><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:math>(0001) films

Prieto, J. E.; M., Trapero, E.; Prieto, Pilar; García-Martín, Eduardo; Soria, Guiomar Delgado; Galán, P.; Figuera, Juan de la

doi:10.1016/j.apsusc.2021.152304

Cited by 4 publications

(5 citation statements)

References 37 publications

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“…Despite having a substantial density of steps compared with the Ru single crystals employed in Ref. 16, as shown in Figure 1b, the films are well ordered and single crystalline as previously characterized 18 and as shown by the diffraction pattern in Figure 1c. The magnetite crystals themselves were grown on top of the Ru films by oxygen-assisted high-temperature molecular beam epitaxy under in-situ observation by low-energy electron microscopy.…”

Section: Resultssupporting

confidence: 51%

“…The substrates were kept at 900 K during film growth. A detailed characterization of the films by Rutherford Backscattering Spectroscopy and channeling has been recently described 18 . The films were then transferred to an ultrahigh vacuum chamber containing a low-energy electron microscope and annealed at temperatures of up to 1300 K. Both the Elmitec III LEEM at the IQFR and the Elmitec SPELEEM at the CIRCE beamline of the ALBA Synchrotron 19 were used for the growth of the magnetite islands.…”

Section: Methodsmentioning

confidence: 99%

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Size effects in the Verwey transition of nanometer-thick micron-wide magnetite crystals

del Campo,

Ruiz-Gómez,

Trapero

et al. 2022

Preprint

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We have monitored the Verwey transition in micrometer-wide, nanometer-thick magnetite islands on epitaxial Ru films on Al2O3(0001) using Raman spectroscopy. The islands have been grown by high-temperature oxygen-assisted molecular beam epitaxy. Below 100 K and for thicknesses above 20 nm the Raman spectra correspond to those observed in bulk crystals and high quality thin films for the sub-Verwey magnetite structure. At room temperature the width of the cubic phase modes is similar to the best reported in bulk crystals, indicating a similar level of electron-phonon interaction. The evolution of the Raman spectra upon cooling suggests that for islands thicker than 20 nm, structural changes appear first at temperatures starting at 150 K and the Verwey transition itself takes place at around 115 K. However, islands thinner than 20 nm show a very different Raman spectra indicating that while a transition takes place, the charge order of the ultrathin islands differs markedly from their thicker counterparts.

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Section: Resultssupporting

confidence: 51%

Section: Methodsmentioning

confidence: 99%

Size effects in the Verwey transition of nanometer-thick micron-wide magnetite crystals

del Campo,

Ruiz-Gómez,

Trapero

et al. 2022

Preprint

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show abstract

“…The sample growth process is schematically depicted in Figure 1 a; it is similar to the procedure employed by Flege and co-workers to grow ceria islands on Ru films. 19 Despite having a higher density of steps, see Figure 1 b, compared with the Ru single crystals we have used before, 16 the films are well ordered and single crystalline as previously characterized 20 and as shown by the diffraction pattern in Figure 1 c. The magnetite crystals themselves were grown on top of the Ru films by oxygen-assisted high-temperature molecular beam epitaxy under in situ observation by low-energy electron microscopy. The growth of iron oxide proceeds in the same way as for single-crystal Ru(0001) substrates; 21 it has been characterized by microspot low-energy electron diffraction as well as X-ray photoemission, X-ray absorption spectroscopy, and X-ray magnetic circular dichroism in photoemission microscopy.…”

Section: Resultsmentioning

confidence: 73%

“…The sample growth process is schematically depicted in Figure a; it is similar to the procedure employed by Flege and co-workers to grow ceria islands on Ru films . Despite having a higher density of steps, see Figure b, compared with the Ru single crystals we have used before, the films are well ordered and single crystalline as previously characterized and as shown by the diffraction pattern in Figure c. The magnetite crystals themselves were grown on top of the Ru films by oxygen-assisted high-temperature molecular beam epitaxy under in situ observation by low-energy electron microscopy.…”

Section: Resultsmentioning

confidence: 94%

Size Effects in the Verwey Transition of Nanometer-Thick Micrometer-Wide Magnetite Crystals

Campo

Ruiz-Gómez

et al. 2022

J. Phys. Chem. C

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We have monitored the Verwey transition in micrometer-wide, nanometer-thick magnetite islands on epitaxial Ru films on Al 2 O 3 (0001) using Raman spectroscopy. The islands have been grown by high-temperature oxygen-assisted molecular beam epitaxy. Below 100 K and for thicknesses above 20 nm, the Raman spectra correspond to those observed in bulk crystals and high-quality thin films for the sub-Verwey magnetite structure. At room temperature, the width of the cubic phase modes is similar to the best reported for bulk crystals, indicating a similar strength of electron–phonon interaction. The evolution of the Raman spectra upon cooling suggests that for islands thicker than 20 nm, structural changes appear first at temperatures starting at 150 K while the Verwey transition itself takes place at around 115 K. However, islands thinner than 20 nm show very different Raman spectra, indicating that while a transition takes place, the charge order of the ultrathin islands differs markedly from their thicker counterparts.

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“…12,38 The use of single-crystal bulk Ru(0001) substrates can be substituted by thin Ru films deposited on insulating substrates, as proved by the growth of ceria 13 and graphene 14 on such films. We have recently characterized those thin films as substrates 15 and found them to be of a quality comparable to that of bulk single crystals. Furthermore, the quality of oxide islands grown on the films is similar to that of those grown on single crystals.…”

Section: ■ Introductionmentioning

confidence: 99%

A Platform for Addressing Individual Magnetite Islands Grown Epitaxially on Ru(0001) and Manipulating Their Magnetic Domains

Ruiz-Gómez

M.²,

Fernández-González

et al. 2023

Crystal Growth & Design

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We have grown high-quality magnetite micrometric islands on ruthenium stripes on sapphire through a combination of magnetron sputtering (Ru film), high-temperature molecular beam epitaxy (oxide islands), and optical lithography. The samples have been characterized by atomic force microscopy, Raman spectroscopy, X-ray absorption and magnetic circular dichroism in a photoemission microscope. The magnetic domains on the magnetite islands can be modified by the application of current pulses through the Ru stripes in combination with magnetic fields. The modification of the magnetic domains is explained by the Oersted field generated by the electrical current flowing through the stripes underneath the magnetite nanostructures. The fabrication method is applicable to a wide variety of rock salt and spinel oxides.

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RBS/Channeling characterization of Ru(0001) and thin epitaxial Ru/Al2O3(0001) films

Cited by 4 publications

References 37 publications

Size effects in the Verwey transition of nanometer-thick micron-wide magnetite crystals

Size effects in the Verwey transition of nanometer-thick micron-wide magnetite crystals

Size Effects in the Verwey Transition of Nanometer-Thick Micrometer-Wide Magnetite Crystals

A Platform for Addressing Individual Magnetite Islands Grown Epitaxially on Ru(0001) and Manipulating Their Magnetic Domains

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