Publication: Anomalous low temperature stair like coercivity decrease due to magnetostatic coupling between superconducting and ferromagnetic particles in mixed powders
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Publication Date
2012-07
Authors
Marín Palacios, Pilar
Aragon, A.M
Lieblich, M.
Garcia Escorial, A.
Crespo del Arco, Patricia
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American Institute of Physics
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Abstract
Magnetization curves of mixed Nb and FeSi based micrometric particles have been analyzed. The influence of the dispersion of Nb particles on the mixture remanence and coercivity has been studied above and below the Nb superconducting critical temperature. The hysteresis loop shows, at 5K and low applied fields, a decrease of both remanence and coercivity with respect to the one of pure ferromagnetic powders as well as a stair like profile. These features are explained as a consequence of the diamagnetic hysteresis loop of Nb giving rise to local stray fields acting on the ferromagnetic particles at its nearest neighboring.
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©2012 American Institute of Physics.
This work has been supported by the MEC of Spain (Consolider-Ingenio 2010 Contract Nos. CSD2007-0010 and MAT2009-14741-C02-01), S2009 MAT 1726, and Project Nos. TSI-020100- 2011-280 and IPT-2011-0893-42000.