Spin and orbital magnetic moments in carbon-encapsulated Fe50 Pt50 nanoparticles
(2007) In Physical Review B - Condensed Matter and Materials Physics 76(10).- Abstract
X-ray absorption and magnetic circular dichroism spectra of as-deposited and postannealed Fe50 Pt50 /C granular multilayers were measured at both the Fe and Pt L2,3 edges. We demonstrate that the partial L 10 ordering of the FePt nanoparticles induced by thermal annealing results in an increase of the effective spin magnetic moments by 200% at the Fe site and by 65% at the Pt site, while the orbital moments are enhanced, in comparison with the as-deposited particles, by 325% and 15% at the Fe and Pt sites. In addition, a change in the x-ray absorption near-edge structure at the C K edge gives evidence for a preferential graphitization of the carbon matrix, which provides a better protection of the nanoparticles against external... (More)
X-ray absorption and magnetic circular dichroism spectra of as-deposited and postannealed Fe50 Pt50 /C granular multilayers were measured at both the Fe and Pt L2,3 edges. We demonstrate that the partial L 10 ordering of the FePt nanoparticles induced by thermal annealing results in an increase of the effective spin magnetic moments by 200% at the Fe site and by 65% at the Pt site, while the orbital moments are enhanced, in comparison with the as-deposited particles, by 325% and 15% at the Fe and Pt sites. In addition, a change in the x-ray absorption near-edge structure at the C K edge gives evidence for a preferential graphitization of the carbon matrix, which provides a better protection of the nanoparticles against external degradation as required for the application of these particles in future magnetic devices.
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- author
- Jaouen, N. ; Babonneau, D. ; Tonnerre, J. M. ; Carbone, D. LU ; Wilhelm, F. LU ; Rogalev, A. ; Johal, T. K. and Van Der Laan, G.
- publishing date
- 2007-09-20
- type
- Contribution to journal
- publication status
- published
- in
- Physical Review B - Condensed Matter and Materials Physics
- volume
- 76
- issue
- 10
- article number
- 104421
- publisher
- American Physical Society
- external identifiers
-
- scopus:34648820314
- ISSN
- 1098-0121
- DOI
- 10.1103/PhysRevB.76.104421
- language
- English
- LU publication?
- no
- id
- 25d65594-0d2f-4f33-88d4-73b2b7a65328
- date added to LUP
- 2021-12-15 11:54:00
- date last changed
- 2022-03-19 05:34:11
@article{25d65594-0d2f-4f33-88d4-73b2b7a65328,
abstract = {{<p>X-ray absorption and magnetic circular dichroism spectra of as-deposited and postannealed Fe50 Pt50 /C granular multilayers were measured at both the Fe and Pt L2,3 edges. We demonstrate that the partial L 10 ordering of the FePt nanoparticles induced by thermal annealing results in an increase of the effective spin magnetic moments by 200% at the Fe site and by 65% at the Pt site, while the orbital moments are enhanced, in comparison with the as-deposited particles, by 325% and 15% at the Fe and Pt sites. In addition, a change in the x-ray absorption near-edge structure at the C K edge gives evidence for a preferential graphitization of the carbon matrix, which provides a better protection of the nanoparticles against external degradation as required for the application of these particles in future magnetic devices.</p>}},
author = {{Jaouen, N. and Babonneau, D. and Tonnerre, J. M. and Carbone, D. and Wilhelm, F. and Rogalev, A. and Johal, T. K. and Van Der Laan, G.}},
issn = {{1098-0121}},
language = {{eng}},
month = {{09}},
number = {{10}},
publisher = {{American Physical Society}},
series = {{Physical Review B - Condensed Matter and Materials Physics}},
title = {{Spin and orbital magnetic moments in carbon-encapsulated Fe50 Pt50 nanoparticles}},
url = {{http://dx.doi.org/10.1103/PhysRevB.76.104421}},
doi = {{10.1103/PhysRevB.76.104421}},
volume = {{76}},
year = {{2007}},
}