Exchange bias effect in partially oxidized amorphous Fe-Ni-B based metallic glass nanostructures


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.






Thomas, S; Pookat, G; Nair, SS; Daniel, M; Dymerska, B; Liebig, A; Al-Harthi, SH; Ramanujan, RV; Anantharaman, MR; Fidler, J; Albrecht, M

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The authors acknowledge B Mainz (TU Chemnitz, Germany) for SEM and EDS measurements. MRA acknowledges the support received through the DST-DAAD exchange program.

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