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Magnetic imaging of vortices in superconducting β-Bi2Pd

AutorCorrea-Orellana, A.; Luccas, Roberto F.; Azpeitia, Jon; Herrera, E.; Fente, A.; Mompean, F. J. ; García Hernández, M. ; Vieira, S.; Guillamón, I.; Embon, E.; Anahory, Y.; Zeldov, E.; Suderow, H.; Munuera, C.
Fecha de publicaciónsep-2016
CitaciónFuerzas y Túnel (2016)
ResumenDirect visualization and manipulation of magnetic structures in superconductors with high spatial resolution and sensitivity is at the aim of state-of-the-art research in fundamental and applied physics. The possibility of imaging the evolution of the vortex lattice provides valuable information on microscopic properties such as the symmetry of the superconducting order parameters or the pinning strength. Here we discuss the observation of superconducting vortices in β-Bi2Pd (Tc=5K[1]) up to fields of 600 Oe combining Magnetic Force Microscopy (MFM) and Squid On the Tip Microscopy (SOT). The combination of both techniques allows investigating the vortex lattice in two different regimes, not accessible with each microscopy alone: from very low fields (~1 Oe) up to higher fields (~600 Oe). We use a commercial MFM (Nanomagnetics Ltd.) in a home-made three axis superconducting coil system [2] that cools down to 2K. Experiments at Weizmann are made at 4.2K in a SOT [3]. We discuss in detail the pinning process of the vortex lattice, the evolution of the magnetic contrast with the temperature and the applied magnetic field. We find that the superconducting parameters of β-Bi2Pd are excellent to allow vortex lattice observation in a large field range. Furthermore, in MFM experiments, interesting new vortex shapes have been observed in the images, that will be discussed in terms of the magnetic interaction between tip and sample, and the different magnetic domain configuration of the MFM tip.
DescripciónTrabajo presentado en la conferencia Fuerzas y Túnel (FyT2016), celebrada en Girona del 5 al 7 de septiembre de 2016.
URIhttp://hdl.handle.net/10261/169839
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