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.
Institute of Physics, Chemnitz University of Technology, 09107 Chemnitz, Germany. senoy.thomas@physik.tu-chemnitz.de
S
S
Thomas
G
G
Pookat
S S
SS
Nair
M
M
Daniel
B
B
Dymerska
A
A
Liebig
S H
SH
Al-Harthi
R V
RV
Ramanujan
M R
MR
Anantharaman
J
J
Fidler
M
M
Albrecht