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J Phys Condens Matter. 2010 Jul 28;22(29):296010. doi: 10.1088/0953-8984/22/29/296010. Epub 2010 Jul 7.

Changing the magnetism of amorphous FeSiB by mechanical milling.

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1
Dipartimento di Fisica, Università di Bologna and CNISM, Bologna, Italy. lucia.delbianco@unibo.it

Abstract

We have studied the magnetic properties of a sample obtained by high-energy mechanical milling from a ferromagnetic FeSiB amorphous ribbon. The milled material mainly consists of a Fe-based amorphous matrix embedding a minor fraction of α-Fe nanocrystallites (∼23%), and magnetization dynamics effects characterize the magnetic behavior. In particular, a magnetic transition occurs at T ∼ 50 K, from a low temperature disordered collective frozen state, similar to a spin-cluster-glass, to a high temperature regime where ferromagnetism predominates. The phenomenon has been ultimately ascribed to the local modification of the interatomic distance distribution in the amorphous matrix, induced by milling.

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