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Large Magnetoresistance at Room Temperature in Ferromagnet/Topological Insulator Contacts

We report magnetoresistance for current flow through iron/topological insulator (Fe/TI) and Fe/evaporated-oxide/TI contacts when a magnetic field is used to initially orient the magnetic alignment of the incorporated ferromagnetic Fe bar, at temperatures ranging from 100 K to room temperature. This magnetoresistance is associated with the relative orientation of the Fe bar magnetization and spin-polarization of electrons moving on the surface of the TI with helical spin-momentum locking. The magnitude of the observed magnetoresistance is relatively large compared to that observed in prior work.

preprint2016arXivOpen access
Sarmita MajumderSamaresh GuchhaitRik DeyLeonard Franklin RegisterSanjay K. Banerjee
cond-mat.mes-hall
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Sarmita MajumderSamaresh GuchhaitRik DeyLeonard Franklin RegisterSanjay K. Banerjee

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