Superparamagnetic resonance of annealed iron-containing borate glass

被引:39
作者
Berger, R
Kliava, J
Bissey, JC
Baietto, V
机构
[1] Univ Bordeaux 1, Ctr Phys Mol Opt & Hertzienne, CNRS UMR 5798, F-33405 Talence, France
[2] Univ Michel de Montaigne, Ctr Rech Phys Appl Archeol, UPRESA CNRS 5060, Esplanade des Antilles, F-33405 Talence, France
关键词
D O I
10.1088/0953-8984/10/38/016
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
A lithium borate glass containing a small amount of iron oxide is studied by electron magnetic resonance at room temperature after repeated annealing steps between 460 and 670 degrees C. As the anneal temperature increases, the g(ef) = 4.3 Sharp line characteristic of isolated iron ions decreases in intensity and finally disappears. Simultaneously, a narrow Line emerges at g(ef) approximate to 2.0, superposed with a broader one, the narrow and the broader components predominating respectively after annealing at lower and at higher temperatures. Computer simulations of spectra have been carried out, based on a model of resonance of ferromagnetic single-domain nanoparticles randomly dispersed in the devitrified glass (superparamagnetic resonance). As the anneal temperature increases, the most probable particle diameter obtained assuming a lognormal distribution of diameters increases from 2.9 to 4.7 nm showing a saturation at higher anneal temperatures, whereas the relative number of larger particles grows continuously.
引用
收藏
页码:8559 / 8572
页数:14
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