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| MAGNETOCALORIC EFFECT IN SUPERPARAMAGNETS |
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| Author(s): MCMICHAEL RD, SHULL RD, SWARTZENDRUBER LJ, BENNETT LH, WATSON RE |
| Source: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS Volume: 111 Issue: 1-2 Pages: 29-33 Published: JUN 1992 |
| Times Cited: 246 References: 12 |
| Abstract: The magnetocaloric effect is calculated for superparamagnetic materials as a function of temperature, field and cluster size. Assuming classical behavior, a universal curve is calculated from which an optimum cluster moment may be found for maximum entropy change upon application of a given field H at a given temperature T. Quantum effects are shown to be small for temperatures above 10 K and fields less than a few tesla. A comparison with results for a spin-7/2 paramagnet such as Gd3Ga5O12 (GGG) is made, which indicates that superparamagnetic materials such as magnetic nanocomposites offer the possibility of extending the upper useful temperature limit of paramagnetic materials for magnetic refrigeration. |
| Document Type: Article |
| Language: English |
| Reprint Address: MCMICHAEL, RD (reprint author), NATL INST STAND & TECHNOL, BLDG 223, RM B152, GAITHERSBURG, MD 20899 USA |
Addresses:
1. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA |
| Publisher: ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS |
| Subject Category: Materials Science, Multidisciplinary; Physics, Condensed Matter |
| IDS Number: JF843 |
| ISSN: 0304-8853 |
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| | | | | | | | | Record from Web of Science® | | | | | | | | | |