Size Effect on Chemical Tuning of Spin-Lattice Relaxation Dynamics in Superparamagnetic Nanocrystals Academic Article

abstract

• The size-dependent chemical tunability of spin-lattice relaxation rate in magnetic nanocrystals has been investigated in size and composition-controlled colloidal superparamagnetic CoxFe3-xO4 nanocrystals employing pump-probe Faraday rotation measurements. With the increase of cobalt content in CoxFe3-xO4 nanocrystals, spin-lattice relaxation rate increased due to the increasing spin-orbit coupling strength regardless of the particle size. However, the range of the chemical tunability of spin-lattice relaxation was narrower in the smaller nanocrystals and the size dependence of spin-lattice relaxation rate became weaker with increasing cobalt content. These observations were explained in terms of weaker chemical tunability of spin-orbit coupling on the surface than in the interior of the nanocrystals using a simple model for spin-lattice relaxation rate that has both surface and interior contributions. 2010 American Chemical Society.

authors

• Son, Dong

published proceedings

• JOURNAL OF PHYSICAL CHEMISTRY C

author list (cited authors)

• Chen, T., Hsia, C., Chen, H., & Son, D. H.

citation count

• 7

complete list of authors

• Chen, Tai-Yen||Hsia, Chih-Hao||Chen, Hsiang-Yun||Son, Dong Hee

publication date

• June 2010

publisher

• American Chemical Society (ACS)  Publisher

published in

• Journal of Physical Chemistry C  Journal

keywords

• 34 Chemical Sciences
• 3406 Physical Chemistry
• 40 Engineering

Digital Object Identifier (DOI)

• 10.1021/jp103568k

start page

• 9713

end page

• 9719

volume

• 114

issue

• 21

URL

• http%3A%2F%2Fdx.doi.org%2F10.1021%2Fjp103568k