Large room-temperature magnetoresistance in lateral organic spin valves fabricated by in situ shadow evaporation |
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| Authors: | M Grünewald J Kleinlein F Syrowatka F Würthner LW Molenkamp G Schmidt |
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| Affiliation: | 1. Physikalisches Institut (EP3), Universität Würzburg, Am Hubland, 97074 Würzburg, Germany;2. Wilhelm Conrad Röntgen Research Center for Complex Material Systems, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany;3. Institut für Organische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany;4. Interdisziplinäres Zentrum für Materialwissenschaften, Martin-Luther-Universität Halle-Wittenberg, 06099 Halle, Germany;5. Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06099 Halle, Germany |
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| Abstract: | We report the successful fabrication of lateral organic spin valves with a channel length in the sub 100 nm regime. The fabrication process is based on in situ shadow evaporation under UHV conditions and therefore yields clean and oxygen-free interfaces between the ferromagnetic metallic electrodes and the organic semiconductor. The spin valve devices consist of Nickel and Cobalt–Iron electrodes and the high mobility n-type organic semiconductor N,N′-bis(heptafluorobutyl)-3,4:9,10-perylene diimide. Our studies comprise fundamental investigations of the process’ and materials’ suitability for the fabrication of lateral spin valve devices as well as magnetotransport measurements at room temperature. The best devices exhibit a magnetoresistance of up to 50%, the largest value for room temperature reported so far. |
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| Keywords: | Organic spintronics Organic spin valves Lateral spin valves Room temperature magnetoresistance Shadow evaporation technique Lateral tunneling |
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