Introducing immobilized metal phthalocyanines as spin-injection and detection layers in organic spin-valves: Spin-tunneling and spin-transport regimes |
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Affiliation: | 1. Departamento de Física, Universidade Federal de São Carlos, CP 676, 13565-905 São Carlos, SP, Brazil;2. Departamento de Química, Universidade Federal de São Carlos, CP 676, 13565-905 São Carlos, SP, Brazil;3. Agilent Technologies, São Paulo, SP, Brazil |
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Abstract: | In (organic) spin-valve devices, two ferromagnetic electrodes having different coercive fields are used to achieve an anti-parallel configuration necessary to enforce spin-flip of electrons within the semiconductor spacer layer. Here we report a use of immobilized magnetic organic molecules as spin-injection and spin-detection layers to form pre-fabricated spin-valve devices. While immobilized manganese- and nickel-phthalocyanines were used as spin-injection and spin-detection layers both, copper phthalocyanine acted as the spacer layer in the all-organic spin-valve devices.In the current-voltage characteristics of parallel and anti-parallel configurations, the electrical resistance was always higher for the latter one implying positive magnetoresistance in the material. By lowering thickness of the spacer layer down to a monolayer region, a tunneling regime could be achieved; spin-flip process in organic spin-valves has been found to be facile in the tunneling regime as compared to that during the spin-transport process through a thicker spacer layer. |
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Keywords: | Organic spin-valves Immobilized molecules as spin-injection and spin-detection layers Magnetic organic molecules Metal phthalocyanines |
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