Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 17 March 2000:
Vol. 287. no. 5460, pp. 1989 - 1992
DOI: 10.1126/science.287.5460.1989
Prev | Table of Contents | Next

Reports

Monodisperse FePt Nanoparticles and Ferromagnetic FePt Nanocrystal Superlattices

Shouheng Sun, 1* C. B. Murray, 1 Dieter Weller, 2 Liesl Folks, 2 Andreas Moser 2

Synthesis of monodisperse iron-platinum (FePt) nanoparticles by reduction of platinum acetylacetonate and decomposition of iron pentacarbonyl in the presence of oleic acid and oleyl amine stabilizers is reported. The FePt particle composition is readily controlled, and the size is tunable from 3- to 10-nanometer diameter with a standard deviation of less than 5%. These nanoparticles self-assemble into three-dimensional superlattices. Thermal annealing converts the internal particle structure from a chemically disordered face-centered cubic phase to the chemically ordered face-centered tetragonal phase and transforms the nanoparticle superlattices into ferromagnetic nanocrystal assemblies. These assemblies are chemically and mechanically robust and can support high-density magnetization reversal transitions.

1 IBM T. J. Watson Research Center, Yorktown Heights, NY 10598, USA.
2 IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120, USA.
*   To whom correspondence should be addressed. E-mail: ssun{at}us.ibm.com

Read the Full Text


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Quantitative analysis of the protein corona on FePt nanoparticles formed by transferrin binding.
X. Jiang, S. Weise, M. Hafner, C. Rocker, F. Zhang, W. J. Parak, and G. U. Nienhaus (2010)
J R Soc Interface 7, S5-S13
   Abstract »    Full Text »    PDF »
Magnetic field-induced assembly of oriented superlattices from maghemite nanocubes.
A. Ahniyaz, Y. Sakamoto, and L. Bergstrom (2007)
PNAS 104, 17570-17574
   Abstract »    Full Text »    PDF »
Synthesis and structures of iron nanoparticles coated with boron nitride nanomaterials.
I. Narita, T. Oku, H. Tokoro, and K. Suganuma (2006)
J. Electron Microsc. (Tokyo) 55, 123-127
   Abstract »    Full Text »    PDF »
Magnetic superlattices and their nanoscale phase transition effects.
J. Cheon, J.-I. Park, J.-s. Choi, Y.-w. Jun, S. Kim, M. G. Kim, Y.-M. Kim, and Y. J. Kim (2006)
PNAS 103, 3023-3027
   Abstract »    Full Text »    PDF »
Superlattices of Iron Nanocubes Synthesized from Fe[N(SiMe3)2]2.
F. Dumestre, B. Chaudret, C. Amiens, P. Renaud, and P. Fejes (2004)
Science 303, 821-823
   Abstract »    Full Text »    PDF »
Virus-Based Toolkit for the Directed Synthesis of Magnetic and Semiconducting Nanowires.
C. Mao, D. J. Solis, B. D. Reiss, S. T. Kottmann, R. Y. Sweeney, A. Hayhurst, G. Georgiou, B. Iverson, and A. M. Belcher (2004)
Science 303, 213-217
   Abstract »    Full Text »    PDF »
n-Type Conducting CdSe Nanocrystal Solids.
D. Yu, C. Wang, and P. Guyot-Sionnest (2003)
Science 300, 1277-1280
   Abstract »    Full Text »    PDF »
Giant Magnetic Anisotropy of Single Cobalt Atoms and Nanoparticles.
P. Gambardella, S. Rusponi, M. Veronese, S. S. Dhesi, C. Grazioli, A. Dallmeyer, I. Cabria, R. Zeller, P. H. Dederichs, K. Kern, et al. (2003)
Science 300, 1130-1133
   Abstract »    Full Text »    PDF »
Supramolecular Chemistry And Self-assembly Special Feature: Beyond molecules: Self-assembly of mesoscopic and macroscopic components.
G. M. Whitesides and M. Boncheva (2002)
PNAS 99, 4769-4774
   Abstract »    Full Text »    PDF »
Colloidal Nanocrystal Shape and Size Control: The Case of Cobalt.
V. F. Puntes, K. M. Krishnan, and A. P. Alivisatos (2001)
Science 291, 2115-2117
   Abstract »    Full Text »
Spin-Dependent Tunneling in Self-Assembled Cobalt-Nanocrystal Superlattices.
C. T. Black, C. B. Murray, R. L. Sandstrom, and S. Sun (2000)
Science 290, 1131-1134
   Abstract »    Full Text »


To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)