Spinodal decomposition of Fe-Cu nanocrystals: Control of atomic-magnetic-moment and magnetic properties



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Crespo del Arco, Patricia and Hernando Grande, Antonio and Garcia Escorial, A. (1994) Spinodal decomposition of Fe-Cu nanocrystals: Control of atomic-magnetic-moment and magnetic properties. Journal of applied physics, 76 (10 (2)). pp. 13227-13230. ISSN 0021-8979

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Official URL: http://dx.doi.org/10.1063/1.358254


Experimental results corresponding to the saturation magnetization and coercive field during the decomposition, upon annealing, of bcc and fcc Fe_xCu_(1-x), obtained by mechanical alloying are reported. The overall behavior points out that the decomposition takes place in two steps: (i) at low temperatures a decrease of the saturation magnetic moment as well as an anomalous thermal dependence of coercive field are observed, however, no phase transformation is detected, and (ii) for further annealing temperatures a new phase appears; the magnetization tends to increase and the coercive field abruptly increases. The analysis of the results leads us to conclude that the first step corresponds to a spinodal decomposition. Fluctuations in the local composition give rise to coexistence of adjacent regions with Curie temperature varying continuously in a range of 1000 K across distances of a few nanometers, thus allowing the tailoring of the magnetic nanostructures.

Item Type:Article
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©1994 The American Physical Society.
This work has been supported by the Spanish CICYT through projects Mat. 92-0491 and Mat. 92-0405. A.H. is indebted to the BBV Foundation for support. We thank Dr. A. R. Yavari, Dr. A. L. Greer, and Dr. F. Gartner for explaining to us the main features of spinodal decomposition.

Uncontrolled Keywords:Fexcu100-X solid-solutions; Immiscible elements
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:42285
Deposited On:26 Apr 2017 16:32
Last Modified:26 Apr 2017 16:32

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