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pro vyhledávání: '"Roma, F."'
We use spin-lattice dynamics simulations to study the possibility of modeling the magnetic hysteresis behavior of a ferromagnetic material. The temporal evolution of the magnetic and mechanical degrees of freedom is obtained through a set of two coup
Externí odkaz:
http://arxiv.org/abs/2205.10418
Autor:
Romá, F.
Publikováno v:
Phys. Rev. B 103, 064403 (2021)
The three-dimensional Edwards-Anderson spin-glass model present strong spatial heterogeneities well characterized by the so-called backbone, a magnetic structure that arises as a consequence of the properties of the ground state and the low-excitatio
Externí odkaz:
http://arxiv.org/abs/2009.12917
Publikováno v:
Phys. Rev. B 101, 174425 (2020)
A silicon micromechanical torsional oscillator is used to measure the hysteresis loops of two manganite La_0.67Ca_0.33MnO_3 nanotubes at different temperatures, applying an external field along its main axes. These structures are composed of nanograi
Externí odkaz:
http://arxiv.org/abs/1912.08844
We present a micron-sized induction magnetometer designed to measure the magnetic response of superconducting mesoscopic samples. The device is manufactured using the Memscap PolyMUMPs process and consists of two octagonal planar parallel micro-coils
Externí odkaz:
http://arxiv.org/abs/1810.02655
Autor:
Longone, P., Roma, F.
Publikováno v:
Phys. Rev. B 97, 214412 (2018)
Chemical techniques are an efficient method to synthesize one-dimensional perovskite manganite oxide nanostructures with a granular morphology, that is, formed by arrays of monodomain magnetic nanoparticles. Integrating the stochastic Landau-Lifshitz
Externí odkaz:
http://arxiv.org/abs/1711.03159
Publikováno v:
Eur. Phys. J. B (2016) 89: 259
We numerically study the three-dimensional Edwards-Anderson model with Gaussian couplings, focusing on the heterogeneities arising in its nonequilibrium dynamics. Results are analyzed in terms of the backbone picture, which links strong dynamical het
Externí odkaz:
http://arxiv.org/abs/1604.00248
Autor:
Matoz-Fernandez, D. A., Roma, F.
We study the critical behavior of two-dimensional short-range quantum spin glasses by numerical simulations. Using a parallel tempering algorithm, we calculate the Binder cumulant for the Ising spin glass in a transverse magnetic field with two diffe
Externí odkaz:
http://arxiv.org/abs/1512.03594
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Autor:
Roma, F., Dominguez, D.
Publikováno v:
Phys. Rev. B 89, 024408 (2014)
The critical behavior of the gauge-glass and the XY spin-glass models in three dimensions is studied by analyzing their nonequilibrium aging dynamics. A new numerical method, which relies on the calculation of the two-time correlation and integrated
Externí odkaz:
http://arxiv.org/abs/1309.6438
Autor:
Roma, F., Risau-Gusman, S.
Publikováno v:
Physical Review E 88, 042105 (2013)
We study the ground-state spatial heterogeneities of the Edwards-Anderson spin-glass model with both bimodal and Gaussian bond distributions. We characterize these heterogeneities by using a general definition of bond rigidity, which allows us to cla
Externí odkaz:
http://arxiv.org/abs/1304.1824