Manganite/Alq3 interfaces investigated by impedance spectroscopy technique |
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Affiliation: | 1. CRS COHERENTIA, CNR-INFM and Dipartimento Scienze Fisiche, Università di Napoli “Federico II”, Piazzale Tecchio 80, 80125 Naples, Italy;2. ISMN – Istituto per lo Studio dei Materiali Nanostrutturati (CNR), via Gobetti 101, 40129 Bologna, Italy |
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Abstract: | With the general objective of studying interfaces between ferromagnetic materials and organic semiconductors, we report ac impedance investigations on La0.7Sr0.3MnO3 (LSMO)/tris(8-hydroxyquinoline)aluminum (Alq3)/Al and Indium Tin Oxide (ITO)/Alq3/Al heterostructures, in the frequency range between 20 Hz and 1 MHz. The comparison of the equivalent circuits deduced to fit the experimental ac responses allows isolating a specific RC contribution which can be attributed to the LSMO/Alq3 interface region. Using the information obtained from our ac measurements, we propose a model which fits the temperature dependence of the magnetoresistance in spin valves combining LSMO electrodes and Alq3 layers. |
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