RT Journal Article
T1 Spinodal decomposition of Fe-Cu nanocrystals: Control of atomic-magnetic-moment and magnetic properties
A1 Crespo del Arco, Patricia
A1 Hernando Grande, Antonio
A1 Garcia Escorial, A.
AB 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.
PB American Institute of Physics
SN 0021-8979
YR 1994
FD 1994-05-01
LK https://hdl.handle.net/20.500.14352/60120
UL https://hdl.handle.net/20.500.14352/60120
LA eng
NO ©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.
NO Spanish CICYT
NO BBV Foundation
DS Docta Complutense
RD 30 abr 2024