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  Self-assembled iron oxide nanoparticle multilayer: x-ray and polarized neutron reflectivity

Mishra, D., Benitez Romero, M. J., Petracic, O., Confalonieri, G., Szary, P., Bruessing, F., et al. (2012). Self-assembled iron oxide nanoparticle multilayer: x-ray and polarized neutron reflectivity. NANOTECHNOLOGY, 23(5), 2-12. doi:10.1088/0957-4484/23/5/055707.

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 Creators:
Mishra, D.1, Author
Benitez Romero, Mario Jose1, 2, Author              
Petracic, O.1, Author
Confalonieri, GAB1, 3, Author
Szary, P.1, Author
Bruessing, F.1, Author
Theis-Broehl, K.4, Author
Devishvili, A.1, 5, Author
Vorobiev, A.6, Author
Konovalov, O.6, Author
Paulus, M.7, Author
Sternemann, C.7, Author
Toperverg, BP1, 8, Author
Zabel, H.1, Author
Affiliations:
1Univ Bochum, Inst Expt Condensed Matter Phys, D-44780 Bochum, ou_persistent22              
2Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, DE, ou_1445589              
3CSIC, Inst Ciencia Mat, E-28049 Madrid, ou_persistent22              
4Univ Appl Sci Bremerhaven, D-27568 Bremerhaven, ou_persistent22              
5Inst Max Von Laue Paul Langevin, F-38042 Grenoble, ou_persistent22              
6European Synchrotron Radiat Facil, F-38043 Grenoble 9, ou_persistent22              
7Tech Univ Dortmund, Fak Phys DELTA, D-44221 Dortmund, ou_persistent22              
8Petersburg Nucl Phys Inst RAS, Gatchina 188350, St Petersburg, ou_persistent22              

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Free keywords: NANOCRYSTAL SUPERLATTICES; FILMS
 Abstract: We have investigated the structure and magnetism of self-assembled, 20 nm diameter iron oxide nanoparticles covered by an oleic acid shell for scrutinizing their structural and magnetic correlations. The nanoparticles were spin-coated on an Si substrate as a single monolayer and as a stack of 5 ML forming a multilayer. X-ray scattering (reflectivity and grazing incidence small-angle scattering) confirms high in-plane hexagonal correlation and a good layering property of the nanoparticles. Using polarized neutron reflectivity we have also determined the long range magnetic correlations parallel and perpendicular to the layers in addition to the structural ones. In a field of 5 kOe we determine a magnetization value of about 80% of the saturation value. At remanence the global magnetization is close to zero. However, polarized neutron reflectivity reveals the existence of regions in which magnetic moments of nanoparticles are well aligned, while losing order over longer distances. These findings confirm that in the nanoparticle assembly the magnetic dipole-dipole interaction is rather strong, dominating the collective magnetic properties at room temperature. Accession Number: WOS:000299316000021

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 Dates: 2012-02-10
 Publication Status: Published in print
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 Rev. Type: Peer
 Identifiers: DOI: 10.1088/0957-4484/23/5/055707
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Title: NANOTECHNOLOGY
Source Genre: Journal
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Pages: - Volume / Issue: 23 (5) Sequence Number: - Start / End Page: 2 - 12 Identifier: -