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Magnetoresistance in Co/AlOx/Co tunnel junction arrays
Institution:1. Postgraduate Program of Environment and Sustainable Technologies, Federal University of Fronteira Sul, Rua Major Antônio Cardoso 1580, 97900-00, Cerro Largo, RS, Brazil;2. Postgraduate Program of Chemical Engineering, West Paraná State University, Rua da Faculdade 645, Jd. Santa Maria, 85903-000, Toledo, PR, Brazil;3. Postgraduate Program of Chemical Engineering, Maringá State University, Av. Colombo 5790, 87020-900, Maringá, PR, Brazil;1. Department of Physics, University of Isfahan, Hezar Jarib Street, Isfahan 81746-73441, Iran;2. Institute of Physics, Faculty of Mining and Geology, V?B – Technical University of Ostrava, 17. Listopadu 15, 70833 Ostrava-Poruba, Czech Republic;3. Institute of Nanotechnology, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany;4. Slovak Academy of Sciences, Watsonova 45, 04001 Ko?ice, Slovakia;1. Department of Metallurgical and Materials Engineering, Middle East Technical University, 06800 Ankara, Turkey;2. Department of Metallurgical and Materials Engineering, Selcuk University, 42030 Konya, Turkey;1. Postgraduate Program of Environment and Sustainable Technologies, Federal University of Fronteira Sul, Rua Major Antônio Cardoso 1580, 97900-00, Cerro Largo, RS, Brazil;2. Postgraduate Program of Chemical Engineering, Federal University of Santa Maria, Av. Roraima, 1000 – 7, 97105-900, Camobi, Santa Maria, RS, Brazil;1. Lomonosov Moscow State University, Department of Physics, Leninskie Gory, 119991 Moscow, Russia;2. Laboratory of Magnetic Metamaterials, Saratov State University Russia, 410012, Astrakhanskaya str. 83, Russia;3. Kotel’nikov Institute of Radioengineering and Electronics of RAS, Fryazino Branch, Vvedensky Sq. 1, Fryazino 141190, Russia;4. Institute for Physics of Microstructures RAS, GSP-105, Nizhny Novgorod 603950, Russia;1. Ames Laboratory, US Department of Energy, Iowa State University, Ames, IA 500011, USA;2. Department of Mechanical and Nuclear Engineering, Virginia Commonwealth University, Richmond, VA 23284, USA;3. Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011, USA
Abstract:Lateral arrays of Co/AlOx/Co junctions with dimensions down to 60 nm and inter-junction separations ~60–100 nm have been fabricated and analyzed for possible coherent tunneling effects. Extra attention is paid to avoid uncertainties due to inconsistencies in switching and/or resistance of successive barriers. We observe ~10% magnetoresistance enhancement at moderate bias in double junctions that cannot be accounted for by a simple model of two resistsors in series.
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