Exchange bias effect in partially oxidized amorphous Fe-Ni-B based metallic glass nanostructures
authors Thomas, S; Pookat, G; Nair, SS; Daniel, M; Dymerska, B; Liebig, A; Al-Harthi, SH; Ramanujan, RV; Anantharaman, MR; Fidler, J; Albrecht, M
nationality International
journal JOURNAL OF PHYSICS-CONDENSED MATTER
keywords SPIN-GLASS; NANOPARTICLES; HETEROSTRUCTURES; MODEL
abstract The magnetic properties of amorphous Fe-Ni-B based metallic glass nanostructures were investigated. The nanostructures underwent a spin-glass transition at temperatures below 100 K and revealed an irreversible temperature following the linear de Almeida-Thouless dependence. When the nanostructures were cooled below 25 K in a magnetic field, they exhibited an exchange bias effect with enhanced coercivity. The observed onset of exchange bias is associated with the coexistence of the spin-glass phase along with the appearance of another spin-glass phase formed by oxidation of the structurally disordered surface layer, displaying a distinct training effect and cooling field dependence. The latter showed a maximum in exchange bias field and coercivity, which is probably due to competing multiple equivalent spin configurations at the boundary between the two spin-glass phases.
publisher IOP PUBLISHING LTD
issn 0953-8984
year published 2012
volume 24
issue 25
digital object identifier (doi) 10.1088/0953-8984/24/25/256004
web of science category Physics, Condensed Matter
subject category Physics
unique article identifier WOS:000304875600023
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journal analysis (jcr 2017):
journal impact factor 2.617
5 year journal impact factor 2.385
category normalized journal impact factor percentile 60.448
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