magnetic properties of the granular alloy fe10ag90 as a function of annealing temperature
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2005
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Abstract
Fe10Ag90 granular alloys have been prepared using a sol-gel process, sintered at 300 °C and annealed at temperatures between 400 °C and 700 °C. The mean size of the iron particles, obtained from X-ray diffraction, is 30.0 ± 0.7 nm. Due to the existence of a distribution of particle sizes in these samples, both blocked (BL) and superparamagnetic (SPM) particles are present simultaneously, as confirmed by magnetization measurements at room temperature. AC susceptibility measurements as a function of temperature reveal a magnetic phase transition at about 770 °C, indicating the presence of particles exhibiting bulk behavior, in the samples annealed above 550 °C. The presence of these particles has been attributed to an atomic diffusion process between the grains, forming bulk-like multiple-domain Fe particles having Curie temperatures near that of bulk alpha-Fe phase (T C = 770 °C).
| Reference Key |
soares2005materialsmagnetic
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| Authors | ;João Maria Soares;José Humberto de Araújo;Francisco de Assis Olímpio Cabral;Thomas Dumelow;Milton Morais Xavier Júnior;José Marcos Sasaki |
| Journal | Majalah Ilmiah Teknologi Elektro |
| Year | 2005 |
| DOI |
10.1590/S1516-14392005000300021
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