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Crystalline, Shape, and Surface Anisotropy in Two Crystal Morphologies of Superparamagnetic Cobalt Nanoparticles by Ferromagnetic Resonance

Diehl, Michael R. and Yu, Jae-Young and Heath, James R. and Held, Glenn A. and Doyle, Hugh and Sun, Shouheng and Murray, Christopher B. (2001) Crystalline, Shape, and Surface Anisotropy in Two Crystal Morphologies of Superparamagnetic Cobalt Nanoparticles by Ferromagnetic Resonance. Journal of Physical Chemistry B, 105 (33). pp. 7913-7919. ISSN 1520-6106. http://resolver.caltech.edu/CaltechAUTHORS:20180302-111919529

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Abstract

Ferromagnetic resonance (FMR) techniques are used to investigate superparamagnetic cobalt nanoparticles (NP's) with different crystalline structures and sizes ranging from 4 to 9 nm in diameter. Magnetic contributions from NC shape, crystallographic structure, defects, and surface structure are discussed. An independent-superparamagnetic-grain model is employed to simulate the FMR measurements. The results from both single crystalline and polycrystalline cobalt NP's reveal that a particle's effective anisotropy, and thus its magnetic properties, are extremely sensitive to internal structure as well as overall particle shape. Finally, surface chemical properties were found to yield unique FMR signatures for NP's at low temperatures.


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http://dx.doi.org/10.1021/jp004252yDOIArticle
https://pubs.acs.org/doi/abs/10.1021/jp004252yPublisherArticle
ORCID:
AuthorORCID
Heath, James R.0000-0001-5356-4385
Additional Information:© 2001 American Chemical Society. Received 20 November 2000. Published online 20 July 2001. Published in print 1 August 2001. This work was supported through an NSF GOALI grant.
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Record Number:CaltechAUTHORS:20180302-111919529
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180302-111919529
Official Citation:Crystalline, Shape, and Surface Anisotropy in Two Crystal Morphologies of Superparamagnetic Cobalt Nanoparticles by Ferromagnetic Resonance Michael R. Diehl, Jae-Young Yu, James R. Heath, Glenn A. Held, Hugh Doyle, Shouheng Sun, and Christopher B. Murray The Journal of Physical Chemistry B 2001 105 (33), 7913-7919 DOI: 10.1021/jp004252y
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:85065
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:02 Mar 2018 21:37
Last Modified:02 Mar 2018 21:37

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