Large Magnetoresistance at Room Temperature in Ferromagnet/Topological Insulator Contacts

Sarmita Majumder; Samaresh Guchhait; Rik Dey; Leonard Franklin Register; Sanjay K. Banerjee

doi:10.1109/TNANO.2016.2572003

Large Magnetoresistance at Room Temperature in Ferromagnet/Topological Insulator Contacts

Mesoscale and Nanoscale Physics 2016-08-24 v1

Authors: Sarmita Majumder , Samaresh Guchhait , Rik Dey , Leonard Franklin Register , Sanjay K. Banerjee

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Abstract

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.

Keywords

magnetoresistance topological insulator ferromagnet contact spin-momentum locking room temperature helical spin polarization

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@article{arxiv.1603.07283,
  title  = {Large Magnetoresistance at Room Temperature in Ferromagnet/Topological Insulator Contacts},
  author = {Sarmita Majumder and Samaresh Guchhait and Rik Dey and Leonard Franklin Register and Sanjay K. Banerjee},
  journal= {arXiv preprint arXiv:1603.07283},
  year   = {2016}
}

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4 pages, 4 figures, submitted in IEEE Transaction

Large Magnetoresistance at Room Temperature in Ferromagnet/Topological Insulator Contacts

Abstract

Keywords

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