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Artículos, Encontrados 11 registros
Artículos Encontrados 11 registros  1 - 10siguiente  ir al registro:
1.
8 p, 722.6 KB Spatial mapping of exciton lifetimes in single ZnO nanowires / Reparaz, Juan Sebastián (Institut Català de Nanociència i Nanotecnologia) ; Callsen, Gordon (Technische Universität Berlin) ; Wagner, Markus R. (Institut Català de Nanociència i Nanotecnologia) ; Güell, Frank (Universitat de Barcelona. Departament d'Electrònica) ; Morante, Joan Ramon (Institut de Recerca en Energia de Catalunya) ; Sotomayor Torres, Clivia M. (Institut Català de Nanociència i Nanotecnologia) ; Hoffmann, Axel (Technische Universität Berlin)
We investigate the spatial dependence of the exciton lifetimes in single ZnO nanowires. We have found that the free exciton and bound exciton lifetimes exhibit a maximum at the center of nanowires, while they decrease by 30% towards the tips. [...]
2013 - 10.1063/1.4808441
APL Materials, Vol. 1, Issue 1 (July 2013) , art. 12103  
2.
8 p, 5.7 MB A new reversal mode in exchange coupled antiferromagnetic/ferromagnetic disks : Distorted viscous vortex / Gilbert, Dustin A. (University of California. Physics Department) ; Ye, Li (University of California. Physics Department) ; Varea Espelt, Aïda (Universitat de Barcelona) ; Agramunt Puig, Sebastià (Universitat Autònoma de Barcelona. Departament de Física) ; Valle Benedí, Nuria del (Universitat Autònoma de Barcelona. Departament de Física) ; Navau Ros, Carles (Universitat Autònoma de Barcelona. Departament de Física) ; López-Barbera, José Francisco (Universitat Autònoma de Barcelona. Departament de Física) ; Buchanan, K.S. (Colorado State University. Department of Physics) ; Hoffmann, Axel (Argonne National Laboratory) ; Sánchez Moreno, Àlvar (Universitat Autònoma de Barcelona. Departament de Física) ; Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; Liu, Kai (University of California. Physics Department) ; Nogués i Sanmiquel, Josep (Institut Català de Nanociència i Nanotecnologia)
Magnetic vortices have generated intense interest in recent years due to their unique reversal mechanisms, fascinating topological properties, and exciting potential applications. In addition, the exchange coupling of magnetic vortices to antiferromagnets has also been shown to lead to a range of novel phenomena and functionalities. [...]
2015 - 10.1039/c5nr01856k
Nanoscale, Vol. 7, Issue 21 (June 2015) , p. 9878-9885  
3.
6 p, 514.5 KB Tailoring the magnetization reversal of elliptical dots using exchange bias (invited) / Sort Viñas, Jordi (Institució Catalana de Recerca i Estudis Avançats) ; Buchanan, K. S. (Argonne National Laboratory. Materials Science Division) ; Pearson, J. E. (Argonne National Laboratory. Materials Science Division) ; Hoffmann, Axel (Argonne National Laboratory. Materials Science Division) ; Menéndez Dalmau, Enric (Universitat Autònoma de Barcelona. Departament de Física) ; Salazar Álvarez, Germán (Institut Català de Nanociència i Nanotecnologia) ; Baró, M. D. (Universitat Autònoma de Barcelona. Departament de Física) ; Miron, M. ((SPINTEC (Spin Electronics Research))) ; Rodmacq, B. ((SPINTEC (Spin Electronics Research))) ; Dieny, B. ((SPINTEC (Spin Electronics Research))) ; Nogués i Sanmiquel, Josep (Institut Català de Nanociència i Nanotecnologia)
Exchange bias effects have been studied in elliptical dots composed of ferromagnetic Ni80Fe20–antiferromagnetic Ir20Mn80 bilayers. The magnetization reversal mechanisms and magnetic configurations have been investigated by magneto-optic Kerr effect and magnetic force microscopy. [...]
2008 - 10.1063/1.2840467
Journal of applied physics, Vol. 103, Núm. 7 (April 2008) , p. 7C109/1-7C109/5  
4.
4 p, 235.0 KB Isothermal tuning of exchange bias using pulsed fields / Nogués i Sanmiquel, Josep (Institut Català de Nanociència i Nanotecnologia) ; Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; Suriñach, Santiago (Suriñach Cornet) (Universitat Autònoma de Barcelona. Departament de Física) ; Muñoz Domínguez, Juan Santiago (Universitat Autònoma de Barcelona. Departament de Física) ; Baró, M. D. (Universitat Autònoma de Barcelona. Departament de Física) ; Bobo, Jean-François (Institut national des sciences appliquées de Toulouse) ; Lüders, Ulrike Anne (Institut national des sciences appliquées de Toulouse) ; Haanappel, E. (Laboratoire National des Champs Magnétiques Pulsés) ; Fitzsimmons, M. R. (Los Alamos National Laboratory) ; Hoffmann, Axel (Argonne National Laboratory. Materials Science Division) ; Cai, J. W. (Chinese Academy of Sciences. Institute of Physics)
Exchange bias,HE, and coercivity,HC, of antiferromagnetic (AFM)/ferromagnetic bilayers can be adjusted, after deposition, at temperatures below the Néel temperature of the AFM by subjecting the samples to large pulsed fields (in excess of HPulse=550 kOe). [...]
2003 - 10.1063/1.1565711
Applied physics letters, Vol. 82, Issue 18 (April 2003) , p. 3044-3046  
5.
4 p, 246.2 KB Controlling magnetic vortices through exchange bias / Sort Viñas, Jordi (Institució Catalana de Recerca i Estudis Avançats) ; Salazar Álvarez, Germán (Universitat Autònoma de Barcelona. Departament de Física) ; Baró, M. D. (Universitat Autònoma de Barcelona. Departament de Física) ; Dieny, B. (SPINTEC (Spin Electronics Research)) ; Hoffmann, Axel (Argonne National Laboratory. Materials Science Division) ; Novosad, V. (Argonne National Laboratory. Materials Science Division) ; Nogués i Sanmiquel, Josep (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
The magnetization reversal in Permalloy (Py) and Py-IrMn disks (1μm diameter) is investigated. The Py disks reverse their magnetization via vortex state formation. Conversely, if the Py-IrMn disks are field cooled from above the blocking temperatureTB, a critical angle with respect to the cooling direction is set, beyond which the vortex no longer nucleates. [...]
2006 - 10.1063/1.2165290
Applied physics letters, Vol. 88, Issue 4 (January 2006) , p. 042502/1-042502/3  
6.
4 p, 572.1 KB Highly asymmetric magnetic behavior in exchange biased systems induced by noncollinear field cooling / Jimenez, E. (Universidad Autónoma de Madrid. Departamento de Física de la Materia Condensada and Instituto "Nicolás Cabrera") ; Camarero, J. (Universidad Autónoma de Madrid. Departamento de Física de la Materia Condensada and Instituto "Nicolás Cabrera") ; Sort Viñas, Jordi (Institució Catalana de Recerca i Estudis Avançats) ; Nogués i Sanmiquel, Josep (Institut Català de Nanociència i Nanotecnologia) ; Hoffmann, Axel (Argonne National Laboratory. Materials Science Division) ; Miranda, R. (Universidad Autónoma de Madrid. Departamento de Física de la Materia Condensada and Instituto "Nicolás Cabrera") ; Teran, F. J. (Instituto Madrileño de Estudios Avanzados en Nanociencia) ; Perna, P. (Instituto Madrileño de Estudios Avanzados en Nanociencia) ; Garcia-Martin, J. M. (Instituto de Microelectrónica de Madrid) ; Dieny, B. (SPINTEC (Spin Electronics Research)) ; Miranda, R. (Universidad Autónoma de Madrid. Departamento de Física de la Materia Condensada and Instituto "Nicolás Cabrera") ; American Physical Society
A detailed study of the angular dependence of the magnetization reversal in polycrystalline ferromagnetic (FM)/antiferromagnetic Co/IrMn bilayers with noncollinear FM and unidirectional anisotropies shows a peculiar asymmetric magnetic behavior. [...]
2009 - 10.1063/1.3236768
Applied physics letters, Vol. 95, Issue 12 (September 2009) , p. 122508/1-122508/3  
7.
4 p, 111.9 KB Two-stage magnetization reversal in exchange biased bilayers / Leighton, C. (University of California, San Diego. Department of Physics) ; Fitzsimmons, M. R. (Los Alamos National Laboratory) ; Yashar, P. (Los Alamos National Laboratory) ; Hoffmann, Axel (Los Alamos National Laboratory) ; Nogués i Sanmiquel, Josep (Universitat Autònoma de Barcelona. Departament de Física) ; Dura, J. (National Institute of Standards and Technology (Estats Units d'Amèrica)) ; Majkrzak, C. F. (National Institute of Standards and Technology (Estats Units d'Amèrica)) ; Schuller, Ivan K. (University of California, San Diego. Department of Physics) ; American Physical Society
MnF2/Fe bilayers exhibit asymmetric magnetization reversal that occurs by coherent rotation on one side of the loop and by nucleation and propagation of domain walls on the other side of the loop. Here, we show by polarized neutron reflectometry, magnetization, and magnetotransport measurements that for samples with good crystalline "quality" the rotation is a two-stage process, due to coherent rotation to a stable state perpendicular to the cooling field direction. [...]
2001 - 10.1103/PhysRevLett.86.4394
Physical review letters, Vol. 86, Issue 19 (May 2001) , p. 4394-4397  
8.
4 p, 4.2 MB Origin of the asymmetric magnetization reversal behavior in exchange-biased systems : competing anisotropies / Camarero, Julio (Universidad Autónoma de Madrid. Departamento de Física de la Materia Condensada) ; Sort Viñas, Jordi (Centre national de la recherche scientifique (França)) ; Hoffmann, Axel (Argonne National Laboratory. Materials Science Division) ; Garcia Martín, José Miguel (Instituto de Microelectrónica de Madrid) ; Dieny, B. (Centre national de la recherche scientifique (França)) ; Miranda, Rodolfo (Universidad Autónoma de Madrid. Departamento de Física de la Materia Condensada) ; Nogués i Sanmiquel, Josep (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
2005 - 10.1103/PhysRevLett.95.057204
Physical review letters, Vol. 95, Issue 5 (July 2005) , p. 057204  
9.
4 p, 287.5 KB Magnetization reversal in submicron disks: exchange biased vortices / Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; Hoffmann, Axel (Argonne National Laboratory. Materials Science Division) ; Chung, S-H. (Argonne National Laboratory. Materials Science Division) ; Buchanan, K. S. (Argonne National Laboratory. Materials Science Division) ; Grimsditch, M. (Argonne National Laboratory. Materials Science Division) ; Baró, M. D. (Universitat Autònoma de Barcelona. Departament de Física) ; Dieny, B. (Centre national de la recherche scientifique (França)) ; Nogués i Sanmiquel, Josep (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
Submicron, circular, ferromagnetic-antiferromagnetic dots exhibit different magnetization reversal mechanisms depending on the direction of the magnetic applied field. Shifted, constricted hysteresis loops, typical for vortex formation, are observed for fields along the exchange bias direction. [...]
2005 - 10.1103/PhysRevLett.95.067201
Physical review letters, Vol. 95, Issue 6 (August 2005) , p. 67201  
10.
3 p, 1.0 MB Role of anisotropy configuration in exchange-biased systems / Jiménez, E. (Universidad Autonoma de Madrid. Departamento de Física de la Materia Condensada) ; Camarero, J. (Universidad Autonoma de Madrid. Departamento de Física de la Materia Condensada) ; Perna, Paolo (Instituto Madrileño de Estudios Avanzados en Nanociencia) ; Mikuszeit, F. (Universidad Autonoma de Madrid. Departamento de Física de la Materia Condensada) ; Teran, F. J. (Instituto Madrileño de Estudios Avanzados en Nanociencia) ; Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; Nogués i Sanmiquel, Josep (Institut Català de Nanociència i Nanotecnologia) ; García-Martín, J. M. (Instituto de Microelectrónica de Madrid) ; Hoffmann, Axel (Argonne National Laboratory. Materials Science Division) ; Dieny, B. (SPINTEC (Spin Electronics Research)) ; Miranda, R. (Universidad Autonoma de Madrid. Departamento de Física de la Materia Condensada)
We present a systematic study of the anisotropy configuration effects on the magnetic properties of exchange-biased ferromagnetic/antiferromagnetic (FM/AFM) Co/IrMn bilayers. The interfacial unidirectional anisotropy is set extrinsically via a field cooling procedure with the magnetic field misaligned by an angle bFC with respect to the intrinsic FM uniaxial anisotropy. [...]
2011 - 10.1063/1.3562507
Journal of applied physics, Vol. 109, Núm. 7 (April 2011) , p. 07D730/1-07D730/3  

Artículos : Encontrados 11 registros   1 - 10siguiente  ir al registro:
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