Magnetotransport properties of annealed (Fe-Co)/Ag multilayers

被引：4

作者：

Dimitrov, DV

Murthy, AS

Hadjipanayis, GC

机构：

[1] Department of Physics and Astronomy, University of Delaware, Newark

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1995年 / 204卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

magnetotransport properties; annealing; sputtering;

D O I：

10.1016/0921-5093(95)09931-X

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The dependence of the giant magnetoresistance (GMR) on the sputtering pressure, the presence of a Ta underlayer and overlayer, the annealing temperature and the bilayer thickness has been studied in sputtered (Fe-Co)/Ag multilayers. The optimum sputtering pressure was found to be 5 mTorr. The Ta underlayer and overlayer influence greatly the microstructural changes during heat treatment and consequently the magnitude of magnetoresistance. The magnetoresistance increases initially with increasing annealing temperature, reaches a maximum in the region between 250 and 325 degrees C and after that decreases. The maximum GMR was 8.43% at 46 K and 5.29% at room temperature for films with Ta layers annealed at 275 degrees C. The magnetic properties are also affected by the annealing. The as-sputtered samples show coercivity in the range 60-220 Oe. After heat treatment in vacuum for 10 min the coercivity drops dramatically in all samples. The films with the highest GMR are believed to be superparamagnetic.

引用

页码：25 / 29

页数：5

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