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Dipòsit Digital de Documents de la UAB 10 registres trobats  La cerca s'ha fet en 0.00 segons. 
1.
6 p, 1.2 MB Electrical control of spin-polarized topological currents in monolayer WTe2 / Garcia, José H. (Institut Català de Nanociència i Nanotecnologia) ; You, Jinxuan (Universitat Autònoma de Barcelona. Departament de Física) ; García-Mota, Mónica (Simune Atomistics S.L.) ; Koval, Peter (Simune Atomistics S.L.) ; Ordejon, Pablo (Institut Català de Nanociència i Nanotecnologia) ; Cuadrado, Ramón (Institut Català de Nanociència i Nanotecnologia) ; Verstraete, Matthieu J. (Université de Liège. Complex and Entangled Systems from Atoms to Materials) ; Zanolli, Zeila (Institut Català de Nanociència i Nanotecnologia) ; Roche, Stephan (Institut Català de Nanociència i Nanotecnologia)
We evidence the possibility for coherent electrical manipulation of the spin orientation of topologically protected edge states in a low-symmetry quantum spin Hall insulator. By using a combination of ab initio simulations, symmetry-based modeling, and large-scale calculations of the spin Hall conductivity, it is shown that small electric fields can efficiently vary the spin textures of edge currents in monolayer 1T'-WTe2 by up to a 90-degree spin rotation, without jeopardizing their topological character. [...]
2022 - 10.1103/PhysRevB.106.L161410
Physical review B, Vol. 106, issue 16 (Oct. 2022) , art. L161410  
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2.
30 p, 6.7 MB Siesta : recent developments and applications / Garcia, Alberto (Institut de Ciència de Materials de Barcelona) ; Papior, Nick (Technical University of Denmark) ; Akhtar, Arsalan (Institut Català de Nanociència i Nanotecnologia) ; Artacho, Emilio (CIC Nanogune BRTA) ; Blum, Volker (Duke University) ; Bosoni, Emanuele (Institut de Ciència de Materials de Barcelona) ; Brandimarte Mendonça, Pedro (Donostia International Physics Center) ; Brandbyge, Mads (Technical University of Denmark) ; Cerdá, J. I. (Instituto de Ciencia de Materiales de Madrid) ; Corsetti, F. (CIC Nanogune BRTA) ; Cuadrado, Ramón (Institut Català de Nanociència i Nanotecnologia) ; Dikan, Vladimir (Institut de Ciència de Materials de Barcelona) ; Ferrer, J. (Universidad de Oviedo) ; Gale, Julian (Curtin University) ; García-Fernández, P. (Universidad de Cantabria) ; García-Suárez, V. M. (Universidad de Oviedo) ; García, Sandra (Institut Català de Nanociència i Nanotecnologia) ; Huhs, Georg (Barcelona Supercomputing Center) ; Illera, Sergio (Institut Català de Nanociència i Nanotecnologia) ; Korytár, R. (Charles University) ; Koval, Peter (Tolosa Hiribidea) ; Lebedeva, Irina S (CIC Nanogune BRTA) ; Lin, Lin (University of California) ; López-Tarifa, P. (Centro de Física de Materiales) ; Mayo, S. G. (Departamento de Física de la Materia Condensada) ; Mohr, S. (Barcelona Supercomputing Center) ; Ordejon, Pablo (Institut Català de Nanociència i Nanotecnologia) ; Postnikov, A. (LCP-A2MC) ; Pouillon, Y. (Universidad de Cantabria) ; Pruneda, Miguel (Institut Català de Nanociència i Nanotecnologia) ; Robles, R. (Centro de Física de Materiales. Centro Mixto) ; Sanchez-Portal, Daniel (Donostia International Physics Center) ; Soler Torroja, José M. (Departamento de Física de la Materia Condensada) ; Ullah, R. (CIC Nanogune BRTA) ; Yu, V. W. Z. (Duke University) ; Junquera, J. (Universidad de Cantabria)
A review of the present status, recent enhancements, and applicability of the Siesta program is presented. Since its debut in the mid-1990s, Siesta's flexibility, efficiency, and free distribution have given advanced materials simulation capabilities to many groups worldwide. [...]
2020 - 10.1063/5.0005077
Journal of chemical physics, Vol. 152, Issue 20 (May 2020) , art. 204108  
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3.
15 p, 589.2 KB Guidelines for selecting interlayer spacers in synthetic 2D-based antiferromagnets from first-principles simulations / Cuadrado, Ramón (Institut Català de Nanociència i Nanotecnologia) ; Pruneda, Miguel (Institut Català de Nanociència i Nanotecnologia)
Following the recent synthesis of graphene-based antiferromagnetic ultrathin heterostructures made of Co and Fe, we analyse the effect of the spacer between both ferromagnetic materials. Using density functional calculations, we carried out an exhaustive study of the geometric, electronic and magnetic properties for intercalated single Co MLs on top of Ir(111) coupled to monolayered Fe through n graphene layers (n = 1, 2, 3) or monolayered h-BN. [...]
2019 - 10.3390/nano9121764
Nanomaterials, Vol. 9, Issue 12 (December 2019) , art. 1764  
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4.
11 p, 614.3 KB Implementation of non-collinear spin-constrained DFT calculations in SIESTA with a fully relativistic Hamiltonian / Cuadrado, Ramón (Institut Català de Nanociència i Nanotecnologia) ; Pruneda, Miguel (Institut Català de Nanociència i Nanotecnologia) ; Garcia, Alberto (Institut de Ciència de Materials de Barcelona) ; Ordejon, Pablo (Institut Català de Nanociència i Nanotecnologia)
An accurate and efficient general method to constrain the magnetization of individual atoms or groups of atoms within a fully relativistic non-collinear spin density functional theory formalism is presented and implemented within the SIESTA code. [...]
2018 - 10.1088/2515-7639/aae7db
JPhys materials, Vol. 1, Núm. 1 (November 2018) , art. 015010  
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5.
6 p, 2.3 MB In-plane/out-of-plane disorder influence on the magnetic anisotropy of Fe1-yMnyPt-L10 bulk alloy / Cuadrado, Ramón (Institut Català de Nanociència i Nanotecnologia) ; Liu, Kai (University of California. Physics Department) ; Klemmer, Timothy J. (Seagate Technology) ; Chantrell, Roy W. (University of York. Department of Physics)
The random substitution of a non-magnetic species instead of Fe atoms in FePt-L1 bulk alloy will permit to tune the magnetic anisotropy energy of this material. We have performed by means of first principles calculations a study of Fe MnPt-L1 (y = 0. [...]
2016 - 10.1063/1.4944534
Applied physics letters, Vol. 108, Issue 12 (March 2016) , art. 123102  
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6.
6 p, 384.6 KB Multiscale modeling of spin transport across a diffuse interface / Chureemart, Jessada (Mahasarakham University. Department of Physics) ; Cuadrado, Ramón (Institut Català de Nanociència i Nanotecnologia) ; Chureemart, Phanwadee (Mahasarakham University. Department of Physics) ; Chantrell, Roy W. (University of York. Department of Physics)
We present multiscale calculations to describe the spin transport behavior of the Co/Cu bilayer structure including the effect of the interface. The multiscale approach introduces the connection between the ab initio calculation used to describe the electronic structure of the system and the generalized spin accumulation model employed to describe the spin transport behavior. [...]
2017 - 10.1016/j.jmmm.2017.07.085
Journal of magnetism and magnetic materials, Vol. 443 (December 2017) , p. 287-292  
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7.
7 p, 1.4 MB Site-Resolved Contributions to the Magnetic-Anisotropy Energy and Complex Spin Structure of Fe/MgO Sandwiches / Cuadrado, Ramón (Institut Català de Nanociència i Nanotecnologia) ; Oroszlány, László (Eötvös University. Department of Physics of Complex Systems) ; Deák, András (Budapest University of Technology and Economics. Department of Theoretical Physics) ; Ostler, Thomas A. (Université de Liège. Department of Physics) ; Meo, Andrea (University of York. Department of Physics) ; Chepulskii, Roman V. (Samsung Electronics) ; Apalkov, Dmytro (Samsung Electronics) ; Evans, Richard F. L. (University of York. Department of Physics) ; Szunyogh, László (Budapest University of Technology and Economics) ; Chantrell, Roy W. (University of York. Department of Physics)
Fe/MgO-based magnetic tunnel junctions are among the most promising candidates for spintronic devices due to their high thermal stability and high tunneling magnetoresistance. Despite its apparent simplicity, the nature of the interactions between the Fe and MgO layers leads to complex finite-size effects and temperature-dependent magnetic properties which must be carefully controlled for practical applications. [...]
2018 - 10.1103/PhysRevApplied.9.054048
Physical review applied, Vol. 9, Issue 5 (May 2018) , art. 54048  
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8.
13 p, 3.3 MB A multiscale model of the effect of Ir thickness on the static and dynamic properties of Fe/Ir/Fe films / Cuadrado, Ramón (Institut Català de Nanociència i Nanotecnologia) ; Oroszlány, László (Eötvös University. Department of Physics of Complex Systems) ; Szunyogh, László (Budapest University of Technology and Economics. MTA-BME Condensed Matter Research Group.) ; Hrkac, Gino (The University of Exeter. College of Engineering, Mathematics and Physical Sciences) ; Chantrell, Roy W. (University of York. Department of Physics) ; Ostler, ThomasA. (Université de Liège. Départment de Physique)
The complex magnetic properties of Fe/Ir/Fe sandwiches are studied using a hierarchical multi-scale model. The approach uses first principles calculations and thermodynamic models to reveal the equilibrium spinwave, magnetization and dynamic demagnetisation properties. [...]
2018 - 10.1038/s41598-018-21934-5
Scientific reports, Vol. 8 ( 2018) , art. 3879  
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9.
10 p, 1.0 MB Graphene-based synthetic antiferromagnets and ferrimagnets / Gargiani, Pierluigi (ALBA Laboratori de Llum de Sincrotró) ; Cuadrado, Ramón (Institut Català de Nanociència i Nanotecnologia) ; Vasili, Hari Babu (ALBA Laboratori de Llum de Sincrotró) ; Pruneda, Miguel (Institut Català de Nanociència i Nanotecnologia) ; Valvidares, Manuel (ALBA Laboratori de Llum de Sincrotró)
Graphene-spaced magnetic systems with antiferromagnetic exchange-coupling offer exciting opportunities for emerging technologies. Unfortunately, the in-plane graphene-mediated exchange-coupling found so far is not appropriate for realistic exploitation, due to being weak, being of complex nature, or requiring low temperatures. [...]
2017 - 10.1038/s41467-017-00825-9
Nature communications, Vol. 8 (September 2017) , art. 699  
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10.
30 p, 2.4 MB Voltage-induced coercivity reduction in nanoporous alloy films : a boost towards energy-efficient magnetic actuation / Quintana Puebla, Alberto (Universitat Autònoma de Barcelona. Departament de Física) ; Zhang, Jin (Universitat Autònoma de Barcelona. Departament de Física) ; Isarain-Chávez, Eloy. (Universitat Autònoma de Barcelona. Departament de Física) ; Menéndez Dalmau, Enric (Universitat Autònoma de Barcelona. Departament de Física) ; Cuadrado, Ramón (Institut Català de Nanociència i Nanotecnologia) ; Robles, Roberto (Institut Català de Nanociència i Nanotecnologia) ; Baró, M. D.. (Universitat Autònoma de Barcelona. Departament de Física) ; Guerrero, Miguel (Universitat Autònoma de Barcelona. Departament de Física) ; Pané i Vidal, Salvador (Institute of Robotics and Intelligent Systems (Zurich, Suïssa)) ; Nelson, Bradley J. (ETH Zurich. Multi-Scale Robotics Laboratory) ; Muller Jevenois, Carlos (Universitat de Barcelona. Departament de Ciència de Materials i Química Física) ; Ordejon, Pablo (Institut Català de Nanociència i Nanotecnologia) ; Nogués, Josep (Institut Català de Nanociència i Nanotecnologia) ; Pellicer Vilà, Eva Maria (Universitat Autònoma de Barcelona. Departament de Física) ; Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física)
Magnetic data storage and magnetically actuated devices are conventionally controlled by magnetic fields generated using electric currents. This involves significant power dissipation by Joule heating effect. [...]
2017 - 10.1002/adfm.201701904
Advanced functional materials, Vol. 27, issue 32 (Aug. 2017) , art. 1701904  
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