Order-disorder transition and Curie transition in Ni70Fe30 nanoalloy

Li, P. Y.; Lu, H. M.; Cao, Z. H.; Tang, S. C.; Meng, X. K.; Li, X. S.; Jiang, Z. H.
May 2009
Applied Physics Letters;5/25/2009, Vol. 94 Issue 21, p213112
Academic Journal
This letter addresses the issue of the order-disorder and Curie transitions in Ni70Fe30 nanoalloy. The ordered phase is observed at room temperature while the disordered phase appears when the nanoalloy is heated up to 773 K. By means of mechanical spectroscopy, x-ray diffraction, and vibrating sample magnetometer measurements, the order-disorder and Curie transition temperatures of 20 nm Ni70Fe30 nanoalloy are determined to be 636 and 728 K, both lower than the corresponding values in the coarse-grained form. Moreover, the reduction in these two critical temperatures is consistent with the predictions of a thermodynamic analytical model.


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