Journal
JOURNAL OF APPLIED PHYSICS
Volume 98, Issue 4, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1997297
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- ICREA Funding Source: Custom
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A large coercive field, H-C=20 kOe, is obtained at room temperature in epsilon-Fe2O3 nanoparticles embedded in a silica matrix, produced by sol-gel chemistry. The combination of a relatively high magnetic anisotropy together with the small saturation magnetization are responsible for this large H-C. Upon cooling, a strong reduction of H-C is observed at T similar to 100 K, which is accompanied by a drastic reduction of the squareness ratio M-R/M-S. Neutron-diffraction measurements reveal the existence of a low-temperature magnetic transition to which the softening of this material can be ascribed. (c) 2005 American Institute of Physics.
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