Abstract
Local magnetic structure of the ferromagnetic (FM) core of Co/CoO nanoparticles with sizes ranging from 5 to 30 nm was investigated. Results of nuclear magnetic resonance (NMR) studies indicate that the Co/CoO nanoparticles are not uniformly magnetized. The examined nanoparticles of all sizes exhibit an FM/antiferromagnetic (AFM) interaction leading to spin canting in the FM region. In all cases, the FM part is pinned with the AFM part even without cooling in external magnetic field. NMR data reveal the coexistence of volumes with collinear and non-collinear magnetic moments in the FM core of the nanoparticles. The ratio of these volumes was quantitatively assessed. It was surmised that the non-collinear (canted) magnetic moments result from interactions between the FM metallic cobalt core of the nanoparticles and AFM surface layers comprised of cobalt oxide CoO.
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This work was performed under financial support of the Ministry of Education and Science of the Russian Federation (Reg. no. 122040400099-5).
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Shmyreva, A.A., Kirillov, V.E., Dzhangurazov, E.B. et al. Inhomogeneous Magnetic Structure of the Metallic FM Part of Co/CoO Nanoparticles by the 59Co Nuclear Magnteic Resonance Method. Russ. J. Phys. Chem. B 17, 764–773 (2023). https://doi.org/10.1134/S1990793123030120
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DOI: https://doi.org/10.1134/S1990793123030120