Spin mediated magneto-electro-thermal transport behavior in Ni80Fe20/MgO/p-Si thin films
| Autor: | Lou, P. C., Beyermann, W. P., Kumar, S. |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Journal of Applied Physics 122, 123905 (2017) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1063/1.5004129 |
| Popis: | In Si, spin-phonon interaction is the primary spin relaxation mechanism. At low temperatures, the absence of spin-phonon relaxation will lead to enhanced spin accumulation. Spin accumulation may change the electro-thermal transport within the material, and thus may serve as an investigative tool for characterizing spin-mediated behavior. Here we present the first experimental proof of spin accumulation induced electro-thermal transport behavior in a Pd (1 nm)/Ni80Fe20 (25 nm)/MgO (1 nm)/p-Si (2 um) specimen. The spin accumulation originates from the spin-Hall effect. The spin accumulation changes the phononic thermal transport in p-Si causing the observed magneto-electro-thermal transport behavior. We also observe the inverted switching behavior in magnetoresistance measurement at low temperatures in contrast to magnetic characterization, which is attributed to the canted spin states in p-Si due to spin accumulation. The spin accumulation is elucidated by current dependent anomalous Hall resistance measurement, which shows a decrease as the electric current is increased. This result may open a new paradigm in the field of spin-mediated transport behavior in semiconductor and semiconductor spintronics. Comment: 25 pages, 5 main and 6 supplementary figures |
| Databáze: | arXiv |
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