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掺铟的铋钙钒石榴石铁氧体单晶生长与磁性

磁性单晶组

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掺铟的铋钙钒石榴石铁氧体单晶生长与磁性

磁性单晶组

THE GROWTH AND MAGNETIC PROPERTIES OF SINGLE CRYSTAL In-SUBSTITUTED BiCaVFe-FERRIMAGNETIC GARNET

MAGNETIC CRYSTAL GROUP
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  • 用助熔剂法生长了石榴石型铁氧体(Bi3-2xCa2xFe5-x-yInyVxO12)单晶,成分为x=1.35±0.02,y=0—0.388。采用本文所述工艺,对不同掺铟量的材料都长出了线度在10毫米以上的包容物很少的单晶。这个系列的单晶材料和Ga-YIG相比居里温度要高10—30℃;磁晶各向异性常数随非磁性离子铟的代入量的增加而很快下降;各向异性场随饱和磁化强度的降低开始略有下降,而后缓慢增加,饱和磁化强度在530—200高斯范围,各向异性场都在40奥以下;X波段共振线宽随饱和磁化强度的降低而增加,似乎存在着与偶极致窄相联系的损耗机构,在上述饱和磁化强度范围,线宽为1—4奥。目前获得的最好材料其磁晶各向异性场为16奥,线宽0.7奥。这些结果表明,这个系列的材料适用于低微波频率单晶器件。
    Single crystals of the ferrimagnetie garnet Bi3-2xCa2xFe5-x-yInyVxO12 are grown by the flux method, with x = 1.35 ±0.02, y = 0-0.388. Single crystals having a dimension greater then 10mm and few inclusions can be obtained for all materials with different. In content by the technology described in this paper. The Curie temperature of all these materials is 10-30℃ higher then that of Ga-YIG with the same magnetization. The magnetic anisotropie constant drops rapidly with increase in number of the nonmagnetic indium ions. The anisotropie field falls slightly at first and then increases gradually with decrease from 530 to 200 Gauss of the saturation magnetization. The ferromagnetic resonance linewidth for the X band region increases with decreasing magnetization. It seems that there exists a relaxation mechanism which is connected with the dipole-n'arrowed model. The linewidth is about 1 to 4 Oe for the materials with the above magnetization. The best materials obtained possess an anisotropie field of 16 Oe and a linewidth of 0.7 Oe. The above results show that these materials can be employed in low frequency microwave devices.
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出版历程
  • 收稿日期:  1976-02-09
  • 刊出日期:  2005-08-03

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