Self assembled nanoparticulate Co:Pt for data storage applications

• Published in: IEEE transactions on magnetics Vol. 36; no. 5; pp. 3009 - 3011
• Main Authors: Warne, B., Kasyutich, O.I., Mayes, E.L., Wiggins, J.A.L., Wong, K.K.W.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.09.2000; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Cobalt base alloys; Cobalt compounds; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Ferromagnetism; Grain size; Intermetallics; Iron; Magnetic films; Magnetic properties and materials; Magnetic properties of monolayers and thin films; Magnetic properties of surface, thin films and multilayers; Magnetic recording; Magnetism; Memory; Nanobioscience; Nanocomposites; Nanomaterials; Nanoparticles; Nanostructure; Physics; Platinum compounds; Proteins; Self-assembly; Temperature; Magnetization curve; Granular layer; Platinum; Coercive force; Superparamagnetism; Self-assembled layers; Experimental study; Cobalt; Nanostructured materials; TEM; Magnetic thin films; Magnetic properties
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/20.908658

Nanoscale CoPt grains were prepared within protein shells from aqueous reactants. A series of particles with varying Co:Pt ratios was used to explore the transition from superparamagnetic to ferromagnetic behavior at room temperature. TEM and electron diffraction confirmed ordered fct CoPt phases with an average grain size of 4.1 nm. Magnetic characterization was performed at room temperature using VSM. The use of this system to prepare high-density recording media is discussed.