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Giant magnetic coercivity and percolation effects in granular Fe-(SiO2) solids

Appl. Phys. Lett. 51, 1280 (1987); doi:10.1063/1.98705

Issue Date: 19 October 1987

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Gang Xiao and C. L. Chien
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218
We demonstrate a novel method for enhancing the coercivity of magnetic materials. Granular Fe-(SiO2) solids have been fabricated over a wide volume fraction range from 15% to 100%. Giant magnetic coercivity, as high as 2500 Oe, has been observed in granular solids in which the isolated Fe granules are only nanometers in size. Across the whole volume fraction range magnetic coercivity experiences dramatic variations due to the change of granular size and percolation effects. Applied Physics Letters is copyrighted by The American Institute of Physics.
History: Received 28 July 1987; accepted 21 August 1987
Permalink: http://link.aip.org/link/?APPLAB/51/1280/1
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KEYWORDS and PACS

Keywords
PACS
  • 75.60.Jp
    Magnetic properties and materials Domain effects, magnetization curves, and hysteresis Fine-particle systems
  • 75.60.Gm
    Magnetic properties and materials Domain effects, magnetization curves, and hysteresis High coercivity materials
  • YEAR: 1987

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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REFERENCES (10)
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