NDLI: Demagnetization cooling of a Chromium cold gas

Content Provider	IEEE Xplore Digital Library
Author	Lahaye, T. Koch, T. Fattori, M. Goetz, S. Griesmaier, A. Hensler, S. Stuhler, J. Pfau, T.
Copyright Year	2007
Description	Author affiliation: Univ. Stuttgart, Stuttgart (Lahaye, T.; Koch, T.; Fattori, M.; Goetz, S.; Griesmaier, A.; Hensler, S.; Stuhler, J.; Pfau, T.)
Abstract	This paper reports on the first experimental realization of demagnetization cooling in a gas. In the presence of an external magnetic field, particles with a permanent magnetic dipole moment try to minimize their energy by aligning their dipole along the field, thus generating a macroscopic magnetization of the material. If the field is reduced enough, the particles are able to change their orientation and to do magnetic work during such a demagnetization process. This is done at the expense of their kinetic energy, with a consequent reduction of the temperature of the system. So far such a process has not been detected in gases because at low density the rate of demagnetization is very low. But Cr atoms have such a large magnetic dipole moment (6 $mu_{B})$ that for experimentally accessible densities of $10^{13}$ $atoms/cm^{3}$ and sufficiently low fields (around 250 mG), they can demagnetize on a timescale of a few seconds.
Starting Page	1
Ending Page	1
File Size	319596
Page Count	1
File Format	PDF
ISBN	9781424409303
DOI	10.1109/CLEOE-IQEC.2007.4386738
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-17
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Gases Temperature Cooling Magnetization Chromium Magnetic moments Magnetic materials Magnetic fields Kinetic energy Demagnetization
Content Type	Text
Resource Type	Article

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