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Title: Separating hyperfine from spin-orbit interactions in organic semiconductors by multi-octave magnetic resonance using coplanar waveguide microresonators

Separating the influence of hyperfine from spin-orbit interactions in spin-dependent carrier recombination and dissociation processes necessitates magnetic resonance spectroscopy over a wide range of frequencies. For this, we have designed compact and versatile coplanar waveguide resonators for continuous-wave electrically detected magnetic resonance and tested these on organic light-emitting diodes. By exploiting both the fundamental and higher-harmonic modes of the resonators, we cover almost five octaves in resonance frequency within a single setup. The measurements with a common π-conjugated polymer as the active material reveal small but non-negligible effects of spin-orbit interactions, which give rise to a broadening of the magnetic resonance spectrum with increasing frequency.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ; ORCiD logo [2] ;  [2] ;  [1] ;  [3] ;  [1]
  1. Univ. of Utah, Salt Lake City, UT (United States). Dept. of Physics and Astronomy
  2. Univ. of Utah, Salt Lake City, UT (United States). Dept. of Electrical and Computer Engineering
  3. Univ. of Utah, Salt Lake City, UT (United States). Dept. of Physics and Astronomy; Univ. of Regensburg (Germany). Inst. of Experimental and Applied Physics
Publication Date:
Grant/Contract Number:
SC0000909; 1121252
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 109; Journal Issue: 10; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Utah, Salt Lake City, UT (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 42 ENGINEERING; microwave spectra; magnetic resonance; microwave circuits; electron paramagnetic resonance spectroscopy; microwaves; spin orbit interactions; hyperfine structure; organic light emitting diodes; magnetic fields; coupled resonators
OSTI Identifier:
1467861
Alternate Identifier(s):
OSTI ID: 1321033

Joshi, G., Miller, R., Ogden, L., Kavand, M., Jamali, S., Ambal, K., Venkatesh, S., Schurig, D., Malissa, H., Lupton, J. M., and Boehme, C.. Separating hyperfine from spin-orbit interactions in organic semiconductors by multi-octave magnetic resonance using coplanar waveguide microresonators. United States: N. p., Web. doi:10.1063/1.4960158.
Joshi, G., Miller, R., Ogden, L., Kavand, M., Jamali, S., Ambal, K., Venkatesh, S., Schurig, D., Malissa, H., Lupton, J. M., & Boehme, C.. Separating hyperfine from spin-orbit interactions in organic semiconductors by multi-octave magnetic resonance using coplanar waveguide microresonators. United States. doi:10.1063/1.4960158.
Joshi, G., Miller, R., Ogden, L., Kavand, M., Jamali, S., Ambal, K., Venkatesh, S., Schurig, D., Malissa, H., Lupton, J. M., and Boehme, C.. 2016. "Separating hyperfine from spin-orbit interactions in organic semiconductors by multi-octave magnetic resonance using coplanar waveguide microresonators". United States. doi:10.1063/1.4960158. https://www.osti.gov/servlets/purl/1467861.
@article{osti_1467861,
title = {Separating hyperfine from spin-orbit interactions in organic semiconductors by multi-octave magnetic resonance using coplanar waveguide microresonators},
author = {Joshi, G. and Miller, R. and Ogden, L. and Kavand, M. and Jamali, S. and Ambal, K. and Venkatesh, S. and Schurig, D. and Malissa, H. and Lupton, J. M. and Boehme, C.},
abstractNote = {Separating the influence of hyperfine from spin-orbit interactions in spin-dependent carrier recombination and dissociation processes necessitates magnetic resonance spectroscopy over a wide range of frequencies. For this, we have designed compact and versatile coplanar waveguide resonators for continuous-wave electrically detected magnetic resonance and tested these on organic light-emitting diodes. By exploiting both the fundamental and higher-harmonic modes of the resonators, we cover almost five octaves in resonance frequency within a single setup. The measurements with a common π-conjugated polymer as the active material reveal small but non-negligible effects of spin-orbit interactions, which give rise to a broadening of the magnetic resonance spectrum with increasing frequency.},
doi = {10.1063/1.4960158},
journal = {Applied Physics Letters},
number = 10,
volume = 109,
place = {United States},
year = {2016},
month = {9}
}