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6 p, 1.1 MB |
Transport fingerprints at graphene superlattice Dirac points induced by a boron nitride substrate
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Martínez Gordillo, Rafael (Institut Català de Nanociència i Nanotecnologia) ;
Roche, Stephan (Institut Català de Nanociència i Nanotecnologia) ;
Ortmann, Frank (Institut Català de Nanociència i Nanotecnologia) ;
Pruneda, Miguel (Institut Català de Nanociència i Nanotecnologia)
We report peculiar transport fingerprints at the secondary Dirac points created by the interaction between graphene and boron nitride layers. By performing ab initio calculations, the electronic characteristics of the moiré patterns produced by the interaction between layers are first shown to be in good agreement with experimental data, and further used to calibrate the tight-binding model implemented for the transport study. [...]
2014 -  10.1103/PhysRevB.89.161401
Physical review B : Condensed matter and materials physics, Vol. 89, issue 16 (April 2014) , art. 161401
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6 p, 979.5 KB |
Anomalous dissipation mechanism and Hall quantization limit in polycrystalline graphene grown by chemical vapor deposition
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Lafont, F. (Laboratoire National de Métrologie et d'Essais) ;
Ribeiro-Palau, Rebeca (Laboratoire National de Métrologie et d'Essais) ;
Han, Z. (Institut polytechnique de Grenoble. Institut Néel) ;
Cresti, Alessandro (Institut polytechnique de Grenoble. Institute of Microelectronics, Electromagnetism and Photonics) ;
Delvallée, Alexandra (Laboratoire National de Métrologie et d'Essais) ;
Cummings, Aron (Institut Català de Nanociència i Nanotecnologia) ;
Roche, Stephan (Institut Català de Nanociència i Nanotecnologia) ;
Bouchiat, Vincent (Institut polytechnique de Grenoble. Institut Néel) ;
Ducourtieux, Sebastien (Laboratoire National de Métrologie et d'Essais) ;
Schopfer, F. (Laboratoire National de Métrologie et d'Essais) ;
Poirier, W. (Laboratoire National de Métrologie et d'Essais)
We report on the observation of strong backscattering of charge carriers in the quantum Hall regime of polycrystalline graphene, grown by chemical vapor deposition, which alters the accuracy of the Hall resistance quantization. [...]
2014 - 10.1103/PhysRevB.90.115422
Physical review B : Condensed matter and materials physics, Vol. 90, issue 11 (Sep. 2014) , art. 115422
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40 p, 2.2 MB |
Fieldlike and antidamping spin-orbit torques in as-grown and annealed Ta/CoFeB/MgO layers
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Avci, Can Onur (Institut Català de Nanociència i Nanotecnologia) ;
Garello, Kevin (Institut Català de Nanociència i Nanotecnologia) ;
Nistor, Corneliu (Institut Català de Nanociència i Nanotecnologia) ;
Godey, Sylvie. (Institut Català de Nanociència i Nanotecnologia) ;
Ballesteros, Belén (Institut Català de Nanociència i Nanotecnologia) ;
Mugarza, Aitor (Institut Català de Nanociència i Nanotecnologia) ;
Barla, Alessandro (Consiglio Nazionale Delle Ricerche. Istituto di Struttura della Materia) ;
Valvidares, Manuel (ALBA Laboratori de Llum de Sincrotró) ;
Pellegrin, Eric. (ALBA Laboratori de Llum de Sincrotró) ;
Ghosh, Abhijit (ETH Zurich. Department of Materials) ;
Miron, Ioan Mihai (SPINTEC) ;
Boulle, Olivier (SPINTEC) ;
Auffret, Stéphane (SPINTEC) ;
Gaudin, Gilles (SPINTEC) ;
Gambardella, Pietro (Institut Català de Nanociència i Nanotecnologia)
We present a comprehensive study of the current-induced spin-orbit torques in perpendicularly magnetized Ta/CoFeB/MgO layers. The samples were annealed in steps up to 300 °C and characterized using x-ray-absorption spectroscopy, transmission electron microscopy, resistivity, and Hall effect measurements. [...]
2014 - 10.1103/PhysRevB.89.214419
Physical review B : Condensed matter and materials physics, Vol. 89, issue 21 (June 2014) , art. 214419
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22 p, 1.1 MB |
Interdependence between training and magnetization reversal in granular Co-CoO exchange bias systems
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Menéndez Dalmau, Enric (KU Leuven. Instituut voor Kern- en Stralingsfysica) ;
Dias, T. (KU Leuven. Instituut voor Kern- en Stralingsfysica) ;
Geshev, Julian (Instituto de Física, Universidade Federal Do Rio Grande Do sul (UFRGS)) ;
López-Barbera, José Francisco (Institut Català de Nanociència i Nanotecnologia) ;
Nogués, Josep (Institut Català de Nanociència i Nanotecnologia) ;
Steitz, Roland (Helmholtz-Zentrum Berlin für Materialien und Energie GmbH) ;
Kirby, Brian (Brian J.) (National Institute of Standards and Technology (Gaithersburg, Estats Units d'Amèrica)) ;
Borchers, J. A. (National Institute of Standards and Technology (Gaithersburg, Estats Units d'Amèrica)) ;
Pereira, L. M. C. (KU Leuven. Instituut voor Kern- en Stralingsfysica) ;
Vantomme, André (KU Leuven, Instituut voor Kern- en Stralingsfysica) ;
Temst, Kristiaan (KU Leuven, Instituut voor Kern- en Stralingsfysica)
The interdependence between training and magnetization reversal in granular Co-CoO exchange bias (EB) systems prepared by O ion implantation in Co thin films is demonstrated by polarized neutron reflectometry. [...]
2014 - 10.1103/PhysRevB.89.144407
Physical review B : Condensed matter and materials physics, Vol. 89, issue 14 (Sep. 2014) , art. 144407
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10 p, 4.8 MB |
Structure and magnetism of Tm atoms and monolayers on W(110)
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Nistor, Corneliu (Institut Català de Nanociència i Nanotecnologia) ;
Mugarza, Aitor (Institut Català de Nanociència i Nanotecnologia) ;
Stepanow, Sebastian (ETH Zürich. Department of Materials) ;
Gambardella, Pietro (Institut Català de Nanociència i Nanotecnologia) ;
Kummer, Kurt (European Synchrotron Radiation Facility) ;
Diez-Ferrer, José Luis (Universidad de Zaragoza. Laboratorio de Microscopias Avanzadas) ;
Coffey, David (Instituto de Ciencia de Materiales de Aragón) ;
De La Fuente, César (Instituto de Ciencia de Materiales de Aragón) ;
Ciria, Miguel (Universidad de Zaragoza. Departamento de Física de la Materia Condensada) ;
Arnaudas, José Ignacio (Universidad de Zaragoza. Departamento de Física de la Materia Condensada)
We investigated the growth and magnetic properties of Tm atoms and monolayers deposited on a W(110) surface using scanning tunneling microscopy and x-ray magnetic circular and linear dichroism. The equilibrium structure of Tm monolayer films is found to be a strongly distorted hexagonal lattice with a Moiré pattern due to the overlap with the rectangular W(110) substrate. [...]
2014 - 10.1103/PhysRevB.90.064423
Physical review B : Condensed matter and materials physics, Vol. 90, issue 6 (Aug. 2014) , art. 64423
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18 p, 4.7 MB |
Quasiparticle spectra of 2H-NbSe2 : two-band superconductivity and the role of tunneling selectivity
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Noat, Y. (Institut des Nanosciences de Paris) ;
Silva-Guillén, Jose Angel (Institut Català de Nanociència i Nanotecnologia) ;
Cren, T. (Institut des Nanosciences de Paris) ;
Cherkez, V. (Institut des Nanosciences de Paris) ;
Brun, C. (Institut des Nanosciences de Paris) ;
Pons, S. (Institut des Nanosciences de Paris) ;
Debontridder, F. (Institut des Nanosciences de Paris) ;
Roditchev, D. (Institut des Nanosciences de Paris) ;
Sacks, W. (Université Paris 6) ;
Cario, L. (Institut des Matériaux Jean Rouxel) ;
Ordejon, Pablo (Institut Català de Nanociència i Nanotecnologia) ;
Garcia, Alberto (Institut de Ciència de Materials de Barcelona) ;
Canadell Casanova, Enric 1950- (Institut de Ciència de Materials de Barcelona)
We have studied the superconducting state of 2H-NbSe2 by scanning tunneling spectroscopy along two different crystal orientations, the c and the a/b axes. Along the c axis a large gap is dominant in the spectra, while a smaller gap is measured along the a/b axis. [...]
2015 - 10.1103/PhysRevB.92.134510
Physical review B : Condensed matter and materials physics, Vol. 92, Issue 13 (October 2015) , art. 134510
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8 p, 1.5 MB |
Tunneling and electronic structure of the two-gap superconductor MgB2
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Silva-Guillén, Jose Angel (Institut Català de Nanociència i Nanotecnologia) ;
Noat, Y. (Institut des Nanosciences de Paris) ;
Cren, T. (Institut des Nanosciences de Paris) ;
Sacks, W. (Institut des Nanosciences de Paris) ;
Canadell Casanova, Enric 1950- (Institut de Ciència de Materials de Barcelona) ;
Ordejon, Pablo (Institut Català de Nanociència i Nanotecnologia)
A combined experimental (superconductor-insulator-superconductor tunneling spectra) and theoretical (density functional theory) study of the two-gap superconductor MgB2 is reported. The calculations confirm that the small gap is associated with a π band mostly based on the boron pz orbitals leading to the three-dimensional band component of the Fermi surface. [...]
2015 - 10.1103/PhysRevB.92.064514
Physical review B : Condensed matter and materials physics, Vol. 92, Issue 6 (August 2015) , art. 64514
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