Competing magnetoresistance contributions in sputtered FePt thin films |
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Authors: | Paolo Allia Federica Celegato Paola Tiberto Franca Albertini Simone Fabbrici |
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Institution: | a Politecnico di Torino, DISMIC, Corso Duca degli Abruzzi 24, I-10129 Torino, Italy b INRIM, Electromagnetism Division, Strada delle Cacce 91, 10135 Torino, Italy c IMEM-CNR, Parco Area delle Scienze 37/A, 43100 Parma, Italy |
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Abstract: | Fe-Pt thin films were deposited by rf sputtering on an MgO substrate heated at different temperatures to induce the formation of the perpendicular Fe-Pt L10 phase with a different grain morphology on the nanometer scale. All films are characterized by a mazelike pattern of FePt nanograins with interconnected bases. MFM images and magnetization curves indicate that all samples have a strong perpendicular magnetic anisotropy arising from (0 0 1) growth. The temperature behaviour of the electrical resistance indicates that a percolating path exists for conduction electrons in the mazelike pattern. The magnetoresistance was measured as a function of magnetic field (applied longitudinally) and temperature in the ranges −70 kOe<H<+70 kOe and 4 K<T<150 K, respectively. All samples display a complex behaviour of the electrical resistance as a function of applied field. The role of the different magnetoresistance effects (both intrinsic and extrinsic) measured in these FePt thin films is elucidated. |
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Keywords: | Magnetic thin film Magnetoresistance Magnetic nanostructure |
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