Q Yan et al 2009 Nanotechnology 20 025609 doi:10.1088/0957-4484/20/2/025609
High-coercivity FePt nanoparticle assemblies embedded in silica thin films
Q Yan1,2,3, A Purkayastha1, A P Singh1, H Li1, A Li2, R V Ramanujan3 and G Ramanath1
Show affiliationsThe ability to process assemblies using thin film techniques in a scalable fashion would be a key to transmuting the assemblies into manufacturable devices. Here, we embed FePt nanoparticle assemblies into a silica thin film by sol–gel processing. Annealing the thin film composite at 650 °C transforms the chemically disordered fcc FePt phase into the fct phase, yielding magnetic coercivity values Hc>630 mT. The positional order of the particles is retained due to the protection offered by the silica host. Such films with assemblies of high-coercivity magnetic particles are attractive for realizing new types of ultra-high-density data storage devices and magneto-composites.
- PACS
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75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.75.+a Magnetic properties of nanostructures
75.50.Vv High coercivity materials
- Subjects
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Condensed matter: electrical, magnetic and optical
- Dates
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Issue 2 (14 January 2009)
Received 2 September 2008, in final form 27 October 2008
Published 11 December 2008
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High-coercivity FePt nanoparticle assemblies embedded in silica thin films
Q Yan et al 2009 Nanotechnology 20 025609
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