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Author Luzuriaga, J.; Badía-Majós, A.; Nieva, G.; Giordano, J.L.; Lopez, C.; Serquis, A.; Serrano, G.
Title Magnetic relaxation induced by transverse flux shaking in MgB2 superconductors Type Journal Article
Year 2009 Publication Superconductor Science and Technology Abbreviated Journal Supercond. Sci. Technol.
Volume 22 Issue Pages 15021
Keywords MgB2
Abstract We report on measurements and numerical simulations of the behavior of MgB2 superconductors when magnetic field components are applied along mutually perpendicular directions. By closely matching the geometry in simulations and measurements, full quantitative agreement is found. The critical state theory and a single phenomenological law, i.e. the field dependence of the critical current density Jc(B), are sufficient for a full quantitative description of the measurements. These were performed in thick strips of carbon nanotube doped MgB2 samples. Magnetization was measured in two orthogonal directions using a SQUID magnetometer. Magnetic relaxation effects induced by the application of an oscillatory perpendicular field were observed and simulated numerically. The measurements confirm the numerical predictions, that two relaxation regimes appear, depending on the amplitude of the applied magnetic field. The overall agreement constitutes a convincing validation of the critical state model and the numerical procedures used.
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Call Number BT @ gnieva @ Serial 421
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Author Luzuriaga, J.; Badía-Majós, A.; Nieva, G.; Giordano, J.L.; Lopez, C.; Serquis, A.; Serrano, G.
Title Experimental and numerical study of transverse flux shaking in MgB2 superconductors Type Conference Article
Year 2009 Publication Journal of Physics: Conference Series Abbreviated Journal J. Phys.: Conf. Ser.
Volume 167 Issue Pages 012009
Keywords
Abstract Magnetization measurements in the mixed state of thick strips of carbon nanotube

doped MgB

2

in crossed fields configurations are reported, together with numerical simulations

performed with a geometry equivalent to the sample shape. The samples were subjected to

magnetic field components along mutually perpendicular directions, an oscillatory field in one

direction and a remanent magnetization in the perpendicular direction. The magnetic response

along the oscillatory field and the magnetic relaxation perpendicular to it are observed and

simulated using the critical state theory. A remarkable quantitative agreement between the

experiment and the theory was obtained.
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Area Expedition Conference XIX Latin American Symposium on Solid State Physics (SLAFES XIX)
Notes Approved no
Call Number BT @ pedrazp @ Serial 737
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