Temperature behavior of anhysteretic magnetization in granular magnetic systems

被引：3
|
作者：
Allia, P
Coisson, M
Tiberto, P
Vinai, F
机构：
[1] Politecn Torino, Dipartimento Fis, I-10129 Turin, Italy
[2] INFM, I-10129 Turin, Italy
[3] Politecn Torino, Dipartimento Meccan, I-10129 Turin, Italy
[4] Ist Elettrotecnico Nazl Galileo Ferraris, I-10125 Turin, Italy
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2001年 / 226卷 / PART II期
关键词：
nanogranular alloys; superparamagnetism; magnetization-temperature dependent;
D O I：
10.1016/S0304-8853(00)01389-5
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Temperature measurements of the anhysteretic, magnetization M were performed on nearly-superparamagnetic, granular Cu90Co10 submitted to different Joule-heating currents using a VSM. Below about 500 K, the anhysteretic magnetization is fully reversible. All isothermal M(H) curves may be fitted by a superposition of Langevin functions with distributed magnetic moments; however, the reduced magnetization M/M-s is not observed to scale with H/T; on the contrary, all curves are nearly exactly coincident when plotted against M-s/T. This result is phenomenologically interpreted in terms of an apparent average magnetic moment linearly growing with the ratio T/M-s. (C) 2001 Elsevier Science B.V. All rights reserved.
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页码：1904 / 1906
页数：3
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