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Nanomagnets of Tunable Size and Composition
Rensselaer Polytechnic Institute
posted on 07/23/2008
Method for making high coercivity nanoparticles with a protective silica shell that prevents agglomeration upon annealing.
Suggested Uses
- Ultrahigh-density recording media
- Flexible data storage devices
- Filler particles for new types of magnetocomposites
Advantages
- Both particle size and FePt composition ratio can be controlled
- Silica or titania shell provides temperature stability allowing annealing to achieve high coercivity (~850 mT) without agglomeration
- Can functionalize shell for organized assembly or incorporation into polymer
- Well-dispersed nanomagnets have tunable particle size over a range of 4-20 nm, and a narrow size distribution
Detailed Description
Nanostructured iron-platinum alloys are attractive as magnetic bits in ulta-high density data storage devices due to a strong tendency to align to a single axis, and a high coercivity that provides permanence in the magnetized state. Researchers at Rensselaer have discovered a method for making high coercivity nanoparticles with a protective silica shell that prevents agglomeration upon annealing.
This room-temperature process uses microemulsions to create stable, mono-disperse FePt nanoparticles, with control over both particle size and composition ratio. The surface of the protective shell can be fucntionalized to facilitate or ganized assemblies of well-separated nanoparticles for recording media, or to incorporate nanomagnets into a polymer matrix or biomaterial.
File Number: RPI-1047
Web site: http://www.rpitechnology.com
Other Information:
Please read more about inventor Dr. G. Ramanath at www.rpi.edu/research/biotech/research...
| Patent Number(s): | 60/792494 |
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This innovation currently is not available for online licensing. Please contact Natasha Sanford at Rensselaer Polytechnic Institute for more information.
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