TY  - JOUR
AU  - Feygenson, Mikhail
AU  - Huang, Zhongyuan
AU  - Xiao, Yinguo
AU  - Teng, Xiaowei
AU  - Lohstroh, Wiebke
AU  - Nandakumaran, Nileena
AU  - Neuefeind, Jörg C.
AU  - Everett, Michelle
AU  - Podlesnyak, Andrey A.
AU  - Salazar-Alvarez, Germán
AU  - Ulusoy, Seda
AU  - Valvo, Mario
AU  - Su, Yixi
AU  - Ehlert, Sascha
AU  - Qdemat, Asma
AU  - Ganeva, Marina
AU  - Zhang, Lihua
AU  - Aronson, Meigan C.
TI  - Probing spin waves in Co$_{3}$O$_{4}$ nanoparticles for magnonics applications
JO  - Nanoscale
VL  - 16
IS  - 3
SN  - 2040-3364
CY  - Cambridge
PB  - RSC Publ.
M1  - FZJ-2024-00457
SP  - 1291-1303
PY  - 2024
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - 38131194
UR  - <Go to ISI:>//WOS:001129107200001
DO  - DOI:10.1039/D3NR04424F
UR  - https://juser.fz-juelich.de/record/1020997
ER  -