Magnetic field of an iron crystal inside a carbon nanotube
This image won First Prize in the "Science Close-Up" category in the Daily Telegraph Visions of Science competition. The image shows a multi-walled carbon nanotube, approximately 190nm in diameter, containing a 35-nm-diameter iron crystal encapsulated inside it. Electron holography has been used to obtain a map of the magnetic field surrounding the iron particle, at a spatial resolution of approximately 5nm. The magnetic phase contours show that the particle contains a single magnetic domain. An external magnetic field could be applied to such particles to exert a torque on the surrounding nanotube. (click to see full sized version)
Acknowledgments: Takeshi Kasama, Rafal Dunin-Borkowski, Krzysztof Koziol, Alan Windle
Visit the University of Cambridge Department of Materials Science & Metallurgy Gallery.
I will post the others in this series over time. To see it all now, visit the Nanotechnology Now Gallery.
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