On the influence of Joule heating induced nanocrystallization on structural and magnetic properties of Co64Fe21B15 alloy

Shashank N. Kane (1) , M. Coisson (2) , Paula Tiberto (2) , Franco Vinai (2) , Frederic Mazaleyrat (3)

1 School of Physics
2 INRiM - Istituto Nazionale di Ricerca Metrologica
3 SATIE-MME - Matériaux Magnétiques pour l'Energie

Structural and magnetic properties of Joule heated Co64Fe21B15 alloy has been studied. Crystallization of the specimens starts after Joule heating with 1.6 ampere current, leading to the formation of nanocrystalline Co80Fe20 phase with grain diameter ranging between 19 to 25 nm. Crystallization of the specimens is found to detoriate the soft magnetic properties. Observed decrease of the hyperfine field of the amorphous component upon Joule heating suggests the increase of the boron near-neighbours to iron and the changes in the hyperfine field of the crystalline component are attributed to the changes in the environment around Fe-atom in the specimen. The coercivity is found to obey a domain wall pinning process instead of random anisotropy, as expected in soft magnetic nanocrystalline magnetic materials.

Mots clés: Nanocrystalline alloys Mössbauer spectroscopy XRD Magnetic properties

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Shashank N. Kane, M. Coisson, Paula Tiberto, Franco Vinai, Frederic Mazaleyrat. On the influence of Joule heating induced nanocrystallization on structural and magnetic properties of Co64Fe21B15 alloy. Current Applied Physics, 2011, 11 (4), pp.981-985. ⟨10.1016/j.cap.2011.01.005⟩. ⟨hal-00608883⟩