Journal Article

FZJ-2019-02235

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Manipulation of dipolar magnetism in low-dimensional iron oxide nanoparticle assemblies

Wang, L.-M. (Corresponding author) ; Qdemat, A.FZJ* ; Petracic, O.FZJ* ; Kentzinger, E.FZJ* ; Rücker, U.FZJ* ; Zheng, F.FZJ* ; Lu, P.FZJ* ; Wei, X.FZJ* ; Dunin-Borkowski, R.FZJ* ; Brückel, T.FZJ*

2019
RSC Publ. Cambridge

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Please use a persistent id in citations: doi:10.1039/C9CP00302A

Abstract: The manipulation of magnetic states in nanoparticle supercrystals promises new pathways to design nanocrystalline magnetic materials and devices. Trench-patterned silicon substrates were used as templates to guide the self-assembly of iron oxide nanoparticles. Grazing incidence small angle X-ray scattering shows that the nanoparticles form a long-range ordered structure along the trench direction while in the direction perpendicular to the trenches, no coherent structure is observable. Electron holography provides evidence of an ordered magnetic state of nanoparticle moments in the remanent state after the application of a saturation magnetic field parallel to the trenches. However, a disordered magnetic state was observed in a perpendicular geometry. Hysteresis loops indicate that the nanoparticle moments form a superferromagnetic state for the geometry parallel to the trenches. Memory effect investigations reveal that the disordered magnetic state corresponds to a collective superspin glass state in the perpendicular geometry, while the superferromagnetic state in the parallel geometry suppresses the superspin glass state.

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Contributing Institute(s):

1. Streumethoden (JCNS-2)
2. Streumethoden (PGI-4)
3. JARA-FIT (JARA-FIT)
4. High Brilliance Source (JCNS-HBS)
5. Mikrostrukturforschung (PGI-5)
6. Physik Nanoskaliger Systeme (ER-C-1)

Research Program(s):

1. 144 - Controlling Collective States (POF3-144) (POF3-144)
2. 524 - Controlling Collective States (POF3-524) (POF3-524)
3. 6212 - Quantum Condensed Matter: Magnetism, Superconductivity (POF3-621) (POF3-621)
4. 6213 - Materials and Processes for Energy and Transport Technologies (POF3-621) (POF3-621)
5. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Appears in the scientific report 2019

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Database coverage:
; Allianz-Lizenz / DFG ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; National-Konsortium ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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