SUPPRESSION OF SUPERPARAMAGNETISM IN SURFACE-OXIDIZED NANOCRYSTALS

被引：4
|
作者：
YANG, X [1 ]
JING, J [1 ]
ENGELMANN, H [1 ]
GONSER, U [1 ]
机构：
[1] UNIV SAARLAND,W-6600 SAARBRUCKEN,GERMANY
来源：
NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA D-CONDENSED MATTER ATOMIC MOLECULAR AND CHEMICAL PHYSICS FLUIDS PLASMAS BIOPHYSICS | 1990年 / 12卷 / 01期
关键词：
Diamagnetism and paramagnetism;
D O I：
10.1007/BF02453024
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Fe nanocrystals (particles with a size of some nanometers) were prepared by the inert-gas condensation method with subsequent oxidization. The average size of the particles in the thin oxide layer was determined to be about 30 Å. The samples were studied by Mössbauer spectroscopy at various temperatures. Superparamagnetism seems to be suppressed in these samples. Furthermore, a two-stage decrease of the average hyperfine field was observed in the oxide layer. The Fe oxide-Fe interface anisotropy is proposed to be responsible for this phenomenon. © 1990 Societá Italiana di Fisica.
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收藏
页码：35 / 43
页数：9
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