by T. N. Makgato, E. Sideras-Haddad, M. A. Ramos, M. García-Hernández, A. Climent-Font, A. Zucchiatti, A. Muñoz-Martin, S. Shrivastava and R. Erasmus
Abstract:
We investigate the magnetic properties of ultra-pure type-IIa diamond following irradiation with proton beams of ≈1–2MeV energy. SQUID magnetometry indicate the formation of Curie type paramagnetism according to the Curie law. Raman and Photoluminescence spectroscopy measurements show that the primary structural features created by proton irradiation are the centers: GR1, ND1, TR12 and 3H. The Stopping and Range of Ions in Matter (SRIM) Monte Carlo simulations together with SQUID observations show a strong correlation between vacancy production, proton fluence and the paramagnetic factor. At an average surface vacancy spacing of ≈1–1.6nm and bulk (peak) vacancy spacing of ≈0.3-0.5nm Curie paramagnetism is induced by formation of ND1 centres with an effective magnetic moment μefftextasciitilde(0.1–0.2)μB. No evidence of long range magnetic ordering is observed in the temperature range 4.2-300K.
Reference:
T. N. Makgato, E. Sideras-Haddad, M. A. Ramos, M. García-Hernández, A. Climent-Font, A. Zucchiatti, A. Muñoz-Martin, S. Shrivastava and R. Erasmus, “Magnetic properties of point defects in proton irradiated diamond”, Journal of Magnetism and Magnetic Materials, vol. 413, no. Supplement C, pp. 76–80.
Bibtex Entry:
@article{makgato_magnetic_2016,
title = {Magnetic properties of point defects in proton irradiated diamond},
volume = {413},
issn = {0304-8853},
url = {http://www.sciencedirect.com/science/article/pii/S0304885316303444},
doi = {10.1016/j.jmmm.2016.04.030},
abstract = {We investigate the magnetic properties of ultra-pure type-IIa diamond following irradiation with proton beams of ≈1–2MeV energy. SQUID magnetometry indicate the formation of Curie type paramagnetism according to the Curie law. Raman and Photoluminescence spectroscopy measurements show that the primary structural features created by proton irradiation are the centers: GR1, ND1, TR12 and 3H. The Stopping and Range of Ions in Matter (SRIM) Monte Carlo simulations together with SQUID observations show a strong correlation between vacancy production, proton fluence and the paramagnetic factor. At an average surface vacancy spacing of ≈1–1.6nm and bulk (peak) vacancy spacing of ≈0.3-0.5nm Curie paramagnetism is induced by formation of ND1 centres with an effective magnetic moment μeff{textasciitilde}(0.1–0.2)μB. No evidence of long range magnetic ordering is observed in the temperature range 4.2-300K.},
number = {Supplement C},
urldate = {2017-11-03},
journal = {Journal of Magnetism and Magnetic Materials},
author = {Makgato, T. N. and Sideras-Haddad, E. and Ramos, M. A. and García-Hernández, M. and Climent-Font, A. and Zucchiatti, A. and Muñoz-Martin, A. and Shrivastava, S. and Erasmus, R.},
month = sep,
year = {2016},
keywords = {Diamond, Paramagnetism, Proton irradiation, Superparamagnetism},
pages = {76--80},
file = {ScienceDirect Full Text PDF:E:\cmam_papers\files\1502\Makgato et al. - 2016 - Magnetic properties of point defects in proton irr.pdf:application/pdf;ScienceDirect Full Text PDF:E:\Usuarios\Administrator\Zotero\storage\UZKY9U8L\Makgato et al. - 2016 - Magnetic properties of point defects in proton irr.pdf:application/pdf;ScienceDirect Snapshot:E:\cmam_papers\files\1499\S0304885316303444.html:text/html;ScienceDirect Snapshot:E:\Usuarios\Administrator\Zotero\storage\YKY9JJW9\S0304885316303444.html:text/html},
}