Observation of single-spin transport in an island-shaped CoFeB double magnetic tunnel junction prepared by magnetron sputtering |
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| Authors: | Thamrongsin Siripongsakul Andras Kovacs Amit Kohn Mikihiko Oogane Yasuo Ando |
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| Affiliation: | 1. Graduate School of Engineering, Department of Applied Physics, Tohoku University, Sendai, Japan;2. Department of Materials, University of Oxford, Oxford, UK |
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| Abstract: | The Co40Fe40B20(CFB)/MgO/CFB/MgO/CFB-based multilayer was prepared by conventional magnetron sputtering and utilised in the fabrication of double magnetic tunnel junctions (DMTJs) for which the middle CFB layers were island-shaped. By analysing the magnetic property of the CFB islands with Langevin’s equation, it was possible to identify their diameters of 7.6, 8.9 and 11.0 nm; accordingly submicron-scaled DMTJs were fabricated to investigate single-spin transport phenomena. The coulomb staircase and the oscillatory tunnel magnetoresistive (TMR) were able to be observed at 6 K, where the TMR ratio was enhanced up to 60%, which is the highest value ever achieved in this structure. |
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| Keywords: | Magnetoresistance double magnetic tunnel junction coulomb staircase island growth |
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