Effect of modified periodic waveforms on current-induced spin polarization measurements

Journal Article · Mon Jun 18 00:00:00 UTC 2018 · AIP Advances

DOI: https://doi.org/10.1063/1.5026760 · OSTI ID:1499031

Iafrate, Joseph R. ^[1]; Huang, Simon ^[2]; Del Gaudio, Davide  ^[2]; Goldman, Rachel S.  ^[2]; Sih, Vanessa ^[2]

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1. Univ. of Michigan, Ann Arbor, MI (United States); Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
2. Univ. of Michigan, Ann Arbor, MI (United States)

Applying a voltage to a semiconductor sample generates a current-induced electron spin polarization (CISP). Using an ultrafast mode-locked laser and lock-in detection scheme, we measure CISP on an indium gallium arsenide epilayer via Faraday rotation and extract the spin generation rate. While the measured spin polarization initially increases linearly with electric field as observed in previous work, larger applied voltages lead to a decreasing spin generation rate. Here we show that we can recover the linear dependence of spin generation rate with electric field even at larger applied voltages by modifying the applied voltage waveform to reduce heating and multiplying by an appropriate correction factor. Future CISP studies can utilize this technique to investigate CISP under larger applied electric fields.

• Research Organization: Univ. of Michigan, Ann Arbor, MI (United States)
• Sponsoring Organization: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
• Grant/Contract Number: SC0016206
• OSTI ID: 1499031
• Journal Information: AIP Advances, Journal Name: AIP Advances Journal Issue: 6 Vol. 8; ISSN 2158-3226
• Publisher: American Institute of Physics (AIP)Copyright Statement
• Country of Publication: United States
• Language: English