Physics tip sheet #39 - Nov...( e situation of water droplets in air t...)

Physics tip sheet #39 - Nov. 17, 2003

e situation of water droplets in air, the water does not play a significant role in sound speed, which explains why we can communicate with sound in rainy weather.

Journal article: Available to journalists on request

5) Magnetic tweezers
L. Helseth, T. Fischer, and T. Johansen
Physical Review Letters (print issue 14 November 2003)

A new kind of "magnetic tweezers" can manipulate single magnetic microparticles with micrometer precision. The authors created a domain wall tip-- a sliver with different magnetization from the surrounding area-- in a thin garnet film by introducing a stress point at the edge of the film. By controlling the tip with an external magnetic field, they can push or pull individual magnetic particles. This technique could be useful in probing and manipulating magnetic structures.

Journal article: http://link.aps.org/abstract/PRL/v91/e208302

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Contact: David Harris
harris@aps.org
301-209-3238
American Physical Society
17-Nov-2003

Page: 1 2 3
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