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

Abstract

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.

Authors:
 [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [1]
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  1. Univ. of Michigan, Ann Arbor, MI (United States)
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE
OSTI Identifier:
1499031
Alternate Identifier(s):
OSTI ID: 1454657
Grant/Contract Number:  
SC0016206
Resource Type:
Accepted Manuscript
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 8; Journal Issue: 6; Journal ID: ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Iafrate, Joseph R., Huang, Simon, Del Gaudio, Davide, Goldman, Rachel S., and Sih, Vanessa. Effect of modified periodic waveforms on current-induced spin polarization measurements. United States: N. p., 2018. Web. doi:10.1063/1.5026760.
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Iafrate, Joseph R., Huang, Simon, Del Gaudio, Davide, Goldman, Rachel S., & Sih, Vanessa. Effect of modified periodic waveforms on current-induced spin polarization measurements. United States. https://doi.org/10.1063/1.5026760
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Iafrate, Joseph R., Huang, Simon, Del Gaudio, Davide, Goldman, Rachel S., and Sih, Vanessa. Mon . "Effect of modified periodic waveforms on current-induced spin polarization measurements". United States. https://doi.org/10.1063/1.5026760. https://www.osti.gov/servlets/purl/1499031.
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@article{osti_1499031,
title = {Effect of modified periodic waveforms on current-induced spin polarization measurements},
author = {Iafrate, Joseph R. and Huang, Simon and Del Gaudio, Davide and Goldman, Rachel S. and Sih, Vanessa},
abstractNote = {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.},
doi = {10.1063/1.5026760},
journal = {AIP Advances},
number = 6,
volume = 8,
place = {United States},
year = {Mon Jun 18 00:00:00 EDT 2018},
month = {Mon Jun 18 00:00:00 EDT 2018}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1063/1.5026760
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Figures / Tables:

Figure 1 Figure 1: (a) Current-induced spin polarization (CISP) measured under application of a 1 V peak square wave for off/on ratios 0, 1, 5, 10, and 20. A vertical offset between curves has been added for clarity. Left panel: This data has not been corrected for decreasing Fourier coefficient with increasingmore » off/on ratio. As the ratio increases, the magnitude of the signal decreases. Right panel: When rescaled by the Fourier coefficient, the signal magnitude of the data is consistent while the signal-to-noise ratio decreases with off/on ratio. (b) Example voltage waveform used to generate CISP. We define a square wave with nonzero voltage for one time unit and zero voltage for n time units to have off/on ratio n. The displayed waveform has off/on ratio 5. (c) As off/on ratio increases, the Fourier sine coefficient corresponding to the fundamental frequency decreases, as does the power dissipated for a 1 V peak square wave, following the Ohmic relation P=V$^2_{RMS}$/R.« less
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Works referenced in this record:

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journal, April 2014

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