Detection of current induced spin polarization in epitaxial Bi$_2$Te$_3$ thin film

Rik Dey; Anupam Roy; Tanmoy Pramanik; Amritesh Rai; Seung Heon Shin; Sarmita Majumder; Leonard F. Register; Sanjay K. Banerjee

doi:10.1063/1.4978691

Detection of current induced spin polarization in epitaxial Bi$_2$Te$_3$ thin film

Mesoscale and Nanoscale Physics 2017-04-10 v1

Authors: Rik Dey , Anupam Roy , Tanmoy Pramanik , Amritesh Rai , Seung Heon Shin , Sarmita Majumder , Leonard F. Register , Sanjay K. Banerjee

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Abstract

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 $_3$ .

Keywords

spin polarization Bi$_2$Te$_3$ thin film current induced molecular beam epitaxy spin-charge transport hysteresis surface state

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@article{arxiv.1704.02031,
  title  = {Detection of current induced spin polarization in epitaxial Bi$_2$Te$_3$ thin film},
  author = {Rik Dey and Anupam Roy and Tanmoy Pramanik and Amritesh Rai and Seung Heon Shin and Sarmita Majumder and Leonard F. Register and Sanjay K. Banerjee},
  journal= {arXiv preprint arXiv:1704.02031},
  year   = {2017}
}

Comments

11 pages (including references), 4 figures (including supplementary information), accepted in journal

Detection of current induced spin polarization in epitaxial Bi$_2$Te$_3$ thin film

Abstract

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