Observation of High Spin-to-Charge Conversion by Sputtered Bismuth Selenide Thin Films at Room Temperature

Mahendra Dc, Jun Yang Chen, Thomas Peterson, Protuysh Sahu, Bin Ma, Naser Mousavi, Ramesh Harjani, Jian Ping Wang

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

We investigated spin-to-charge conversion in sputtered Bi43Se57/Co20Fe60B20 heterostructures with in-plane magnetization at room temperature. High spin-to-charge conversion voltage signals have been observed at room temperature. The transmission electron microscope images show that the sputtered bismuth selenide thin films are nanogranular in structure. The spin-pumping voltage decreases with an increase in the size of the grains. The inverse Edelstein effect length (λIEE) is estimated to be as large as 0.32 nm. The large λIEE is due to the spin-momentum locking and is further enhanced by quantum confinement in the nanosized grains of the sputtered bismuth selenide films. We also investigated the effect on spin-pumping voltage due to the insertion of layers of MgO and Ag. The MgO insertion layer has almost completely suppressed the spin-pumping voltage, whereas the Ag insertion layer has enhanced the λIEE by 43%.

Original languageEnglish (US)
Pages (from-to)4836-4844
Number of pages9
JournalNano letters
Volume19
Issue number8
DOIs
StatePublished - Aug 14 2019

Keywords

  • granular bismuth selenide
  • inverse Edelstein effect
  • quantum confinement effect
  • spin-to-charge conversion
  • topological insulator

PubMed: MeSH publication types

  • Journal Article

Fingerprint Dive into the research topics of 'Observation of High Spin-to-Charge Conversion by Sputtered Bismuth Selenide Thin Films at Room Temperature'. Together they form a unique fingerprint.

Cite this