TY  - JOUR
AU  - Wang, Li-Ming
AU  - Qdemat, Asma
AU  - Petracic, Oleg
AU  - Kentzinger, Emmanuel
AU  - Rücker, Ulrich
AU  - Zheng, Fengshan
AU  - Lu, Penghan
AU  - Wei, Xiankui
AU  - Dunin-Borkowski, Rafal
AU  - Brückel, Thomas
TI  - Manipulation of dipolar magnetism in low-dimensional iron oxide nanoparticle assemblies
JO  - Physical chemistry, chemical physics
VL  - 21
IS  - 11
SN  - 1463-9076
CY  - Cambridge
PB  - RSC Publ.
M1  - FZJ-2019-02235
SP  - 6171 - 6177
PY  - 2019
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - pmid:30821806
UR  - <Go to ISI:>//WOS:000462659300029
DO  - DOI:10.1039/C9CP00302A
UR  - https://juser.fz-juelich.de/record/861807
ER  -