Sol-Gel Fabricated CoFe_(2)O_(4)/SiO_(2) Nanocomposites: Synthesis and Magnetic Properties

Jana Vejpravova; Jiri Plocek; Daniel NiznanskyAlzbeta HutlovaJean L. RehspringerVladimir Sechovsky

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Sol-Gel Fabricated CoFe_(2)O_(4)/SiO_(2) Nanocomposites: Synthesis and Magnetic Properties

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Well-defined CoFe_(2)O_(4) nanoparticles embedded in an amorphous SiO_(2) matrix have been synthesized by a sol-gel method, characterized and investigated by Mossbauer spectroscopy and magnetic properties measurements. The mean particle size increases from 3 to 15 nm consistently with the temperature of the subsequent annealing, which varied from 800 deg C to 1100 deg C, respectively. The composites exhibit superparamagnetic behavior with the blocking temperature T_(B) increasing with the mean particle size from 80 to 350 K, respectively. Sufficiently high value of H_(c) approx 2.5 T (at 2 K) has been observed for the sample annealed at 1100 deg C.

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来源
《IEEE Transactions on Magnetics》 |2005年第10期|3469-3471|共3页
作者
Jana Vejpravova; Jiri Plocek; Daniel NiznanskyAlzbeta HutlovaJean L. RehspringerVladimir Sechovsky;
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作者单位

Charles University in Prague, Faculty of Mathematics, 121 16-Praha 2, Czech Republic;

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正文语种英语
中图分类计量学;
关键词
Ferrite nanoparticles; sol-gel method; superparamagnetism;

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Sol-Gel Fabricated CoFe_(2)O_(4)/SiO_(2) Nanocomposites: Synthesis and Magnetic Properties

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