Magnetic correlation states in cosputtered granular Ag100-xFex films

被引：29
作者：
Allia, P
Coisson, M
Spizzo, F
Tiberto, P
Vinai, F
机构：
[1] Politecn Torino, Dipartimento Fis, I-10129 Turin, Italy
[2] Politecn Torino, INFM, Res Unit, I-10129 Turin, Italy
[3] Ist Elettrotecnico Nazl Galileo Ferraris, I-10135 Turin, Italy
[4] Politecn Torino, Res Unit, INFM, I-10135 Turin, Italy
[5] Univ Ferrara, Dipartimento Fis, I-44100 Ferrara, Italy
[6] INFM, Res Unit Ferrara, I-44100 Ferrara, Italy
来源：
PHYSICAL REVIEW B | 2006年 / 73卷 / 05期
关键词：
D O I：
10.1103/PhysRevB.73.054409
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Measurements of isothermal magnetization, initial and high-field static susceptibility, and magnetoresistance have been performed at various temperatures on five Ag100-xFex granular films of variable Fe content (10 <= x <= 30) obtained by cosputtering. Magnetoresistance and magnetization data have been systematically combined to determine the magnetic correlation volume in each sample and its evolution with temperature and magnetic field. A coherent picture of the whole set of Ag100-xFex films has been obtained. On increasing x, these alloys exhibit a magnetic behavior of increasing complexity, from the interacting superparamagnetic phase with weakly interacting magnetic moments and small correlation volumes to frustrated ferromagnetism with strong magnetic interactions, loss of physical identity of Fe particles, and extended correlation volumes. The degree of alignment of individual magnetic moments within a correlation volume and the stability of correlation volumes themselves against an external magnetic field are discussed in some detail.
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页数：11
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