skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A qualitative study of spin polarization effect in defect tuned Co/graphene/Co nanostructures

Abstract

Theoretical reports predict that in contact with a ferromagnetic giant spin, spin polarization evolves in defective graphene since defects in graphene act as local spin moments. We have synthesized different Co/graphene/Co nano spin valve like structures tuning the degree of defect applying ultrasonic vibration and characterized them by Raman spectroscopy. Initially with increasing I{sub D}/I{sub G} ratio in Raman spectra, antiferromagnetic coupling between the Co nanosheets on either sides of graphene enhances leading to betterment in spin transport through graphene. But for highest I{sub D}/I{sub G}, a totally new phenomenon called antiferro quadrupolar ordering (AFQ) takes place which eventually reduces the spin polarization effect.

Authors:
Publication Date:
OSTI Identifier:
22308040
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1620; Journal Issue: 1; Conference: Optics 14: International conference on optics: Light and its interactions with matter, Calicut, Kerala (India), 19-21 Mar 2014; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ANTIFERROMAGNETISM; COBALT; COUPLING; FERROMAGNETISM; GRAPHENE; HETEROJUNCTIONS; NANOSTRUCTURES; RAMAN SPECTRA; RAMAN SPECTROSCOPY; SPIN; SPIN ORIENTATION

Citation Formats

Mandal, Sumit, and Saha, Shyamal K., E-mail: smtdone@gmail.com, E-mail: cnssks@iacs.res.in. A qualitative study of spin polarization effect in defect tuned Co/graphene/Co nanostructures. United States: N. p., 2014. Web. doi:10.1063/1.4898297.
Mandal, Sumit, & Saha, Shyamal K., E-mail: smtdone@gmail.com, E-mail: cnssks@iacs.res.in. A qualitative study of spin polarization effect in defect tuned Co/graphene/Co nanostructures. United States. https://doi.org/10.1063/1.4898297
Mandal, Sumit, and Saha, Shyamal K., E-mail: smtdone@gmail.com, E-mail: cnssks@iacs.res.in. 2014. "A qualitative study of spin polarization effect in defect tuned Co/graphene/Co nanostructures". United States. https://doi.org/10.1063/1.4898297.
@article{osti_22308040,
title = {A qualitative study of spin polarization effect in defect tuned Co/graphene/Co nanostructures},
author = {Mandal, Sumit and Saha, Shyamal K., E-mail: smtdone@gmail.com, E-mail: cnssks@iacs.res.in},
abstractNote = {Theoretical reports predict that in contact with a ferromagnetic giant spin, spin polarization evolves in defective graphene since defects in graphene act as local spin moments. We have synthesized different Co/graphene/Co nano spin valve like structures tuning the degree of defect applying ultrasonic vibration and characterized them by Raman spectroscopy. Initially with increasing I{sub D}/I{sub G} ratio in Raman spectra, antiferromagnetic coupling between the Co nanosheets on either sides of graphene enhances leading to betterment in spin transport through graphene. But for highest I{sub D}/I{sub G}, a totally new phenomenon called antiferro quadrupolar ordering (AFQ) takes place which eventually reduces the spin polarization effect.},
doi = {10.1063/1.4898297},
url = {https://www.osti.gov/biblio/22308040}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1620,
place = {United States},
year = {Wed Oct 15 00:00:00 EDT 2014},
month = {Wed Oct 15 00:00:00 EDT 2014}
}