Journal Article FZJ-2024-00457

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Probing spin waves in Co$_{3}$O$_{4}$ nanoparticles for magnonics applications

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2024
RSC Publ. Cambridge

Nanoscale 16(3), 1291-1303 () [10.1039/D3NR04424F]

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Abstract: The magnetic properties of spinel nanoparticles can be controlled by synthesizing particles of a specific shape and size. The synthesized nanorods, nanodots and cubic nanoparticles have different crystal planes selectively exposed on the surface. The surface effects on the static magnetic properties are well documented, while their influence on spin waves dispersion is still being debated. Our ability to manipulate spin waves using surface and defect engineering in magnetic nanoparticles is the key to designing magnonic devices. We synthesized cubic and spherical nanoparticles of a classical antiferromagnetic material Co3O4 to study the shape and size effects on their static and dynamic magnetic proprieties. Using a combination of experimental methods, we probed the magnetic and crystal structures of our samples and directly measured spin wave dispersions using inelastic neutron scattering. We found a weak, but unquestionable, increase in exchange interactions for the cubic nanoparticles as compared to spherical nanoparticle and bulk powder reference samples. Interestingly, the exchange interactions in spherical nanoparticles have bulk-like properties, despite a ferromagnetic contribution from canted surface spins.

Keyword(s): Magnetic Materials (1st) ; Condensed Matter Physics (2nd) ; Magnetism (2nd)

Classification:

Contributing Institute(s):
  1. Streumethoden (JCNS-2)
  2. Streumethoden (PGI-4)
  3. JARA-FIT (JARA-FIT)
  4. JCNS-ESS (JCNS-ESS)
  5. JCNS-FRM-II (JCNS-FRM-II)
  6. Neutronenstreuung (JCNS-1)
  7. Heinz Maier-Leibnitz Zentrum (MLZ)
Research Program(s):
  1. 6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4) (POF4-6G4)
Experiment(s):
  1. TOFTOF: Cold neutron time-of-flight spectrometer (NL2au)

Appears in the scientific report 2024
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Medline ; Creative Commons Attribution CC BY 3.0 ; OpenAccess ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF >= 5 ; JCR ; National-Konsortium ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection
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The record appears in these collections:
Institute Collections > JCNS > JCNS-FRM-II
Document types > Articles > Journal Article
Institute Collections > JCNS > JCNS-ESS
Institute Collections > JCNS > JCNS-2
Institute Collections > JCNS > JCNS-1
JARA > JARA > JARA-JARA\-FIT
Institute Collections > PGI > PGI-4
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 Record created 2024-01-12, last modified 2025-02-04


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