MAGNETIC-BEHAVIOR OF METASTABLE FCC FE-CU AFTER THERMAL TREATMENTS

被引:96
作者
CRESPO, P
HERNANDO, A
YAVARI, R
DRBOHLAV, O
ESCORIAL, AG
BARANDIARAN, JM
ORUE, I
机构
[1] INST NATL POLYTECH GRENOBLE, THERMODYNAM & PHYSICOCHIM MET LAB, F-38402 ST MARTIN DHERES, FRANCE
[2] CSIC, CENIM, E-28040 MADRID, SPAIN
[3] UNIV BASQUE COUNTRY, E-48080 BILBAO, SPAIN
来源
PHYSICAL REVIEW B | 1993年 / 48卷 / 10期
关键词
D O I
10.1103/PhysRevB.48.7134
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A ferromagnetic and supersaturated fcc Fe51Cu49 solid solution has been obtained by mechanical alloying. After subsequent thermal treatments the fcc phase undergoes a spinodal decomposition which finally, at 780 K, yields a mixture of fcc and bcc phases. In this work, a systematic magnetic study is carried out on samples at different decomposition states in order to determine the process of transformation into the stable phases. We observe a 20% maximum diminution on the magnetic moment with increasing temperatures of the thermal treatment. The Mossbauer spectrum taken at 8 K shows that 20% of the Fe atoms are in a nonferromagnetic state. On the other hand, upon heating up to 723 K the room-temperature coercive field increases dramatically to 640 Oe, and after cooling down to 10 K it decreases to 270 Oe. Deviations from the T3/2 law in the temperature dependence of the magnetization have been observed. This behavior is explained by fluctuations in composition due to the spinodal decomposition, which lead to fluctuations of the magnetic order parameters, i.e., magnetic moment and Curie temperature.
引用
收藏
页码:7134 / 7139
页数:6
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