A granular Fe(53)Pt(47) film and two (Fe(53)Pt(47))-Ag multilayers were prepared by rf sputtering on heated MgO (1 0 0) substrates. The samples were annealed in situ to induce a perpendicular anisotropy. The topography and magnetic domain structure are studied by AFM/MFM imaging. Magnetization loops are measured by alternating gradient magnetometry in directions perpendicular and parallel to the film plane from 5 K to room temperature. Magnetoresistance measurements are performed in the 2-300 K temperature interval by a standard four-contact method (maximum field: 70 kOe). Ag addition hinders the formation of the perpendicular phase. A negative magnetoresistance is observed in all samples, pointing to a spin-dependent scattering effect from FePt nanoparticles. (c) 2007 Elsevier B.V. All rights reserved.
Effect of Ag addition on the magnetic and magnetoresistance properties of Fe53Pt47 films / P., Allia; F., Celegato; Coisson, Marco; Tiberto, PAOLA MARIA; Vinai, Franco; F., Albertini; F., Casoli; S., Fabbrici. - In: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - ISSN 0304-8853. - 316:2(2007), pp. e35-e39. [10.1016/j.jmmm.2007.02.019]
Effect of Ag addition on the magnetic and magnetoresistance properties of Fe53Pt47 films
F. CELEGATO;COISSON, MARCO;TIBERTO, PAOLA MARIA;VINAI, FRANCO;
2007
Abstract
A granular Fe(53)Pt(47) film and two (Fe(53)Pt(47))-Ag multilayers were prepared by rf sputtering on heated MgO (1 0 0) substrates. The samples were annealed in situ to induce a perpendicular anisotropy. The topography and magnetic domain structure are studied by AFM/MFM imaging. Magnetization loops are measured by alternating gradient magnetometry in directions perpendicular and parallel to the film plane from 5 K to room temperature. Magnetoresistance measurements are performed in the 2-300 K temperature interval by a standard four-contact method (maximum field: 70 kOe). Ag addition hinders the formation of the perpendicular phase. A negative magnetoresistance is observed in all samples, pointing to a spin-dependent scattering effect from FePt nanoparticles. (c) 2007 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
