title: Changing the magnetism of amorphous FeSiB by mechanical milling.
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.
authors.affiliation: Dipartimento di Fisica, Università di Bologna and CNISM, Bologna, Italy. lucia.delbianco@unibo.it
authors.forename: L
authors.initials: L
authors.lastname: Del Bianco
authors.forename: F
authors.initials: F
authors.lastname: Spizzo
authors.forename: M
authors.initials: M
authors.lastname: Tamisari
authors.forename: E
authors.initials: E
authors.lastname: Bonetti
authors.forename: F
authors.initials: F
authors.lastname: Ronconi
authors.forename: D
authors.initials: D
authors.lastname: Fiorani