Tripp, S. L.; Dunin-Borkowski, R.; Wei, A. “Flux Closure in Self-Assembled Cobalt Nanoparticle Rings.” Angew. Chem. Int. Ed. 2003, 42, 5591-93. 

Description:

Shown are cobalt nanoparticles that have self-assembled into bracelet-like “nanorings” less than 100 nanometers across.  The rings’ magnetic flux are oriented in either a clockwise or counterclockwise direction, a characteristic that could make them useful in magnetic memory devices.  By using a technique known as electron holography the researchers were able to observe directly the flux-closure states, which are stable at room temperature.  Magnetic rings are currently being considered as memory elements in devices for long-term data storage and magnetic random-access memory.  The rings contain a magnetic field, or flux, which can flow in one of two directions, clockwise or counterclockwise. Magnetic rings can thus store binary information, and unlike most magnets, the rings keep the flux to themselves. This minimizes crosstalk and reduces error during data processing.”
 

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