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Vélez, M. ; González Herrera, Elvira María ; Martín, J. I. ; Vicent López, José Luis | American Physical Society | 1996-07-01?-axis-oriented EuBa_2Cu_3O_7/PrBa_2Cu_3O_7 (EBCO/PBCO) superlattices allow us to separate contributions to the anisotropy coming from the natural layered structure of EBCO from that introduced by the artificial layering with PBCO. The angular d[...]texto impreso
Jaque, D. ; González Herrera, Elvira María ; Martín, J. I. ; Anguita,, J. V. ; Vicent López, José Luis | American Institute of Physics | 2002-10-07Arrays of submicrometric Ni lines have been fabricated in superconducting Nb films by electron beam lithography. In the mixed state, these arrays induce strong anisotropy in the dissipation behavior. The dissipation is reduced several orders of [...]texto impreso
González Herrera, Elvira María ; Villegas, J. E. ; Varela del Arco, María ; Santamaría Sánchez-Barriga, Jacobo ; Prieto, P. ; Schuller, Ivan K. ; Vicent López, José Luis | American Institute of Physics | 2002-05-27Bi_2Sr_2CaCu_2O_8, RBa_2Cu_3O_7 (R=Y, Eu) thin films and RBa_2Cu_3O_7/PrBa_2Cu_3O_7 superlattices have been fabricated by sputtering technique. The anisotropic dissipation was measured close to the critical temperatures with high applied magneti[...]texto impreso
Gómez Nicola, Ángel ; Cebollada, F. ; Palomares, F. J. ; Sánchez, N. ; González Herrera, Elvira María ; González, J. M. ; Vicent López, José Luis | American Institute of Physics | 2014-03-10In this work, we improve the ability to tailor the switching mechanism in nanomagnets by introducing an additional, highly controlled source of anisotropy: magnetocrystalline anisotropy. We analyze the vortex dynamics in single crystal Fe nanotr[...]texto impreso
Gómez Nicola, Ángel ; Gilbert, D. A. ; González Herrera, Elvira María ; Liu, Kai ; Vicent López, José Luis | American Institute of Physics | 2013-02-04Hybrid superconducting/magnetic nanostructures on Si substrates have been built with identical physical dimensions but different magnetic configurations. By constructing arrays based on Co-dots with in-plane, out-of-plane, and vortex state magne[...]texto impreso
Jaafar, M. ; Yanes,, R. ; Pérez de Lara, D. ; Chubykalo Fesenko, O. ; Asenjo, A. ; González Herrera, Elvira María ; Anguita, J. V. ; Vázquez, V. ; Vicent López, José Luis | American Physical Society | 2010-02Magnetic vortex dynamics in lithographically prepared nanodots is currently a subject of intensive research, particularly after recent demonstration that the vortex polarity can be controlled by in-plane magnetic field. This has stimulated the p[...]texto impreso
Dinis Vizcaíno, Luis Ignacio ; González Herrera, Elvira María ; Anguita, J. V. ; Parrondo, J. M. R. ; Vicent López, José Luis | American Physical Society | 2007-12A collective mechanism for current reversal in superconducting vortex ratchets is proposed. The mechanism is based on a two-dimensional instability of the ground state (T=0) of the system. We illustrate our results with numerical simulations and[...]texto impreso
Villegas, J. E. ; González Herrera, Elvira María ; Montero,, M. I. ; Schuller, Ivan K. ; Vicent López, José Luis | American Physical Society | 2003-12Rectangular pinning arrays of Ni dots define a potential landscape for vortex motion in Nb films. Magnetotransport experiments in which two in-plane orthogonal electrical currents are injected simultaneously allow one to select the direction and[...]texto impreso
Perez de Lara, Daniel ; Alija, A. ; González Herrera, Elvira María ; Martín, J. I. ; Vélez, M. ; Colino, J. L. ; Anguita,, J. V. ; Vicent López, José Luis | American Institute of Physics | 2009-03-23Superconducting a-Mo_(3)Si and Nb films have been grown on arrays of Ni nanodots. We have studied the vortex lattice dynamics close to critical temperatures. Different vortex lattice configurations are obtained with the same array unit cell. The[...]texto impreso
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Villegas, J. E. ; Nuñez, N. O. ; González Herrera, Elvira María ; González, M. P. ; Vicent López, José Luis | Indian Academy Sciences | 2006-01Nb films grown on top of an array of asymmetric pinning centers show a vortex ratchet effect. A net flow of vortices is induced when the vortex lattice is driven by fluctuating forces on an array of pinning centers without reflection symmetry. [...]texto impreso
Villegas, J. E. ; González Herrera, Elvira María ; González, M. P. ; Anguita, J. V. ; Vicent López, José Luis | American Physical Society | 2005-01A vortex lattice ratchet effect has been investigated in Nb films grown on arrays of nanometric Ni triangles, which induce periodic asymmetric pinning potentials. The vortex lattice motion yields a net dc voltage when an ac driving current is ap[...]texto impreso
Villegas, J. E. ; González Herrera, Elvira María ; González, M. P. ; Nuñez, N. O. ; Anguita, J. V. ; Vicent López, José Luis | Amer Inst Physics | 2006Superconducting Nb thin films were grown on different arrays of triangle-shape metallic islands. The vortex lattice dynamics could be strongly modified by these asymmetric vortex traps. These asymmetric pinning potentials lead to a rectification[...]texto impreso
Pérez de Lara, D. ; González Herrera, Elvira María ; Vicent López, José Luis | American Physical Society | 2010-11-19The superconducting and magnetic properties of a-Co_(x)Si_(1?x) /Nb bilayers have been studied as a function of Co content in order to analyze the superconducting/ferromagnetic proximity effect in a system with strong disorder in the magnetic la[...]texto impreso
Valle Granda, Javier del ; Gómez Nicola, Ángel ; González Herrera, Elvira María ; Mañas Baena, Manuel ; Coronado, E. ; Vicent López, José Luis | American Physical Society | 2017-06-12Superconducting 2H-NbSe_2 single crystals show intrinsic low pinning values. Therefore, they are ideal materials with which to explore fundamental properties of vortices. (V, I) characteristics are the experimental data we have used to investiga[...]
