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Spin Waves Across Three-Dimensional, Close-Packed Nanoparticles

Published

Author(s)

Kathryn Krycka, James Jennings Rhyne, Samuel D Oberdick, Ahmed M. Abdelgawad, Julie A. Borchers, Yumi Ijiri, Sara A. Majetich, Jeffrey W. Lynn

Abstract

Inelastic neutron scattering is utilized to measure the spin waves, or magnons, which arise from inter-particle coupling between 8.4 nm ferrite nanoparticles that are self-assembled into a close-packed lattice, yet physically separated by oleic acid surfactant. The observed magnons are dispersive, respond to an applied magnetic field, and display the expected temperature-dependent Bose population factor. Moreover, the dispersion yields a non-negative energy gap only when the effective Q is reduced by the inter-particle spacing, confirming that it is an excitation between the nanoparticles ,rather than originating within individual nanoparticles. The experimental results are well explained by a limited parameter model which treats the 3D ordered, magnetic nanoparticles as dipolar-coupled superspins.
Citation
New Journal of Physics
Volume
20

Keywords

spin waves, nanoparticles, inelastic neutron scattering

Citation

, K. , , J. , , S. , , A. , Borchers, J. , Ijiri, Y. , , S. and , J. (2018), Spin Waves Across Three-Dimensional, Close-Packed Nanoparticles, New Journal of Physics, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=924544 (Accessed June 22, 2024)

Issues

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Created December 21, 2018, Updated October 10, 2019