GMR as a function of temperature in FeAg granular samples: the effect of magnetic interactions

被引：21

作者：

Spizzo, F

Angeli, E

Bisero, D

Ronconi, F

Vavassori, P

Allia, P

Selvaggini, V

Coisson, M

Tiberto, P

Vinai, F

机构：

[1] Univ Ferrara, INFM, I-44100 Ferrara, Italy

[2] Univ Ferrara, Dipartimento Fis, I-44100 Ferrara, Italy

[3] Politecn Torino, INFM, Turin, Italy

[4] Politecn Torino, Dipartimento Fis, Turin, Italy

[5] Ist Elettrotecnico Nazl Galileo Ferraris, Turin, Italy

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2003年 / 262卷 / 01期

关键词：

giant magnetoresistance; co-sputtering; superparamagnetism; dipolar interactions; Fe-Ag granular samples;

D O I：

10.1016/S0304-8853(03)00025-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have deposited various FeAg granular systems having different iron content and we have investigated their giant magnetoresistive properties as a function of temperature. In a previous work we observed that, at room temperature, with increasing Fe content samples behaviour changes from superparamagnetic to ferromagnetic-like, and 20% is the concentration that separates these two regimes. In correspondence with this value, the dependence of giant magnetoresistance intensity as a function of iron concentration shows a maximum. With decreasing temperature, we observed that the position of this maximum shifts progressively towards lower iron concentrations, This behaviour has been discussed in terms of the presence of magnetic interparticle interactions. An analysis of the dependence of giant magnetoresistance as a function of applied field at the various temperatures is also presented. (C) 003 Elsevier Science B.V. All rights reserved,

引用

页码：88 / 91

页数：4

共 9 条

[1] Magnetic hysteresis based on dipolar interactions in granular magnetic systems [J].