Detection of current induced spin polarization in epitaxial Bi$_2$Te$_3$ thin film
| Autor: | Dey, Rik, Roy, Anupam, Pramanik, Tanmoy, Rai, Amritesh, Shin, Seung Heon, Majumder, Sarmita, Register, Leonard F., Banerjee, Sanjay K. |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Applied Physics Letters 110, 122403 (2017) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1063/1.4978691 |
| Popis: | We electrically detect charge current induced spin polarization on the surface of molecular beam epitaxy grown Bi$_2$Te$_3$ thin film in a two-terminal device with a ferromagnetic MgO/Fe and a nonmagnetic Ti/Au contact. The two-point resistance, measured in an applied magnetic field, shows a hysteresis tracking the magnetization of the Fe. A theoretical estimate is obtained for the change in resistance on reversing the magnetization direction of Fe from coupled spin-charge transport equations based on quantum kinetic theory. The order of magnitude and the sign of the hysteresis is consistent with spin-polarized surface state of Bi$_2$Te$_3$. Comment: 11 pages (including references), 4 figures (including supplementary information), accepted in journal |
| Databáze: | arXiv |
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