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Title: Probing spin waves in Co3O4 nanoparticles for magnonics applications

Journal Article · · Nanoscale
DOI: https://doi.org/10.1039/d3nr04424f · OSTI ID:2267621
ORCiD logo [1];  [2]; ORCiD logo [2]; ORCiD logo [3];  [4];  [5];  [6];  [6]; ORCiD logo [6]; ORCiD logo [7];  [7]; ORCiD logo [7];  [8];  [9];  [10]; ORCiD logo [8];  [11];  [12]
  1. European Spallation Source ERIC, Lund (Sweden); Forschungszentrum Jülich (Germany). Jülich Centre for Neutron Science (JCNS-1); Uppsala Univ. (Sweden)
  2. Peking Univ., Shenzhen (China)
  3. Worcester Polytechnic Institute, MA (United States)
  4. Technische Universität München, Garching (Germany). Heinz Maier-Leibnitz Zentrum (MLZ)
  5. Forschungszentrum Jülich (Germany). Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institute (PGI-4)
  6. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  7. Uppsala Univ. (Sweden)
  8. Heinz Maier-Leibnitz-Zentrum (MLZ), Garching (Germany). Jülich Centre for Neutron Science (JCNS-4); Forschungszentrum Jülich, Garching (Germany)
  9. Forschungszentrum Jülich, (Germany). Jülich Centre for Neutron Science (JCNS-1)
  10. Forschungszentrum Jülich, (Germany). Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institute (PGI-4)
  11. Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
  12. Univ. of British Columbia, Vancouver, BC (Canada)

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS); Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Swedish Research Council
Grant/Contract Number:
AC05-00OR22725; SC0012704
OSTI ID:
2267621
Alternate ID(s):
OSTI ID: 2376879
Journal Information:
Nanoscale, Journal Name: Nanoscale Vol. 10; ISSN 2040-3364
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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