Magnetoresistance (MR) measurements were done on a set of ferromagnetic films and multilayers containing different amount of FePt alloy produced by rf sputtering. From High to intermediate temperatures (above about 10 K) the MR is explained in terms of standard mechanisms related to the granularity of samples. At lower temperatures, where R is almost independent of T, a drop in the resistance is measured, whose magnitude and position depend on the applied field. Below the drop temperature, a region of positive MR is observed around H = 0 in measurements done with the magnetic field applied either parallel or perpendicular to the film plane. The two anomalies are not explained by standard MR mechanisms; it is suggested that they can be interpreted in terms of weak localization of conduction electrons inhibited by the inner stray fields related to magnetic inhomogeneity present in all samples on the nanometric scale.

Low-temperature magnetotransport effects and magnetic inhomogeneity in FePt-based ferromagnetic thin films / Allia, P; Celegato, F; Coisson, Marco; Tiberto, PAOLA MARIA; Vinai, Franco; Albertini, F; Casoli, F.. - In: JOURNAL OF PHYSICS D. APPLIED PHYSICS. - ISSN 0022-3727. - 41:13(2008), pp. 134016-1-134016-5. [10.1088/0022-3727/41/13/134016]

Low-temperature magnetotransport effects and magnetic inhomogeneity in FePt-based ferromagnetic thin films

COISSON, MARCO;TIBERTO, PAOLA MARIA;VINAI, FRANCO;
2008

Abstract

Magnetoresistance (MR) measurements were done on a set of ferromagnetic films and multilayers containing different amount of FePt alloy produced by rf sputtering. From High to intermediate temperatures (above about 10 K) the MR is explained in terms of standard mechanisms related to the granularity of samples. At lower temperatures, where R is almost independent of T, a drop in the resistance is measured, whose magnitude and position depend on the applied field. Below the drop temperature, a region of positive MR is observed around H = 0 in measurements done with the magnetic field applied either parallel or perpendicular to the film plane. The two anomalies are not explained by standard MR mechanisms; it is suggested that they can be interpreted in terms of weak localization of conduction electrons inhibited by the inner stray fields related to magnetic inhomogeneity present in all samples on the nanometric scale.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11696/32761
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