MAGNETO-VOLUME EFFECTS OF GAMMA-FE PRECIPITATES IN CU AND CUAL MATRICES

被引:28
作者
EZAWA, T
MACEDO, WAA
GLOS, U
KEUNE, W
SCHLETZ, KP
KIRSCHBAUM, U
机构
[1] UNIV DUISBURG GESAMTHSCH,TIEFTEMPERATURPHYS LAB,D-4100 DUISBURG,FED REP GER
[2] OSAKA UNIV,DEPT MAT PHYS,TOYONAKA,OSAKA 560,JAPAN
来源
PHYSICA B | 1989年 / 161卷 / 1-3期
关键词
D O I
10.1016/0921-4526(89)90149-X
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
We have determined the dependence of the magnetic transition temperature TN and of the magnetic hyperfine field Bhf on particle volume and on matrix lattice parameter in coherent antiferromagnetic γ-Fe precipitates in Cu100-xAlx matrices (0≤x≤14) by 57Fe Mössabuer spectroscopy and dc susceptibility measurements. The average particle diameter d was determined precisely by transmission electron microscopy (TEM). The behavior of TN(d) and of Bhf(d) at 4.2 K for γ-Fe in Cu is in agreement with a suggested structural phase transition at TN for d{greater-than or approximate}20 nm. Precipitates smaller than d≈15-20 nm show superparamagnetism. The saturation hyperfine-field (and consequently the atomic Fe moment) of γ-Fe was found to increase remarkably with increasing lattice expansion of the CuAl matrix. © 1989.
引用
收藏
页码:281 / 284
页数:4
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