Random anisotropy and domain-wall pinning process in the magnetic properties of rapidly quenched Nd[sub 60]Fe[sub 30]Al[sub 10]

Bracchi, A.; Samwer, K.; Schneider, S.; Löffler, J. F.
February 2003
Applied Physics Letters;2/3/2003, Vol. 82 Issue 5, p721
Academic Journal
The magnetic properties and microstructure of glassy Nd[sub 60]Fe[sub 30]Al[sub 10] splat-quenched samples have been investigated by small-angle neutron scattering, Mössbauer spectroscopy, and vibrating sample magnetometry. The presence of chemical inhomogeneities in the amorphous sample is evidenced by small-angle neutron scattering which indicates a complex network of atom clusters with an average diameter of 15 nm. These results are confirmed by the magnetization measurements which show the coexistence of two magnetic phases with different ordering temperatures and indicate phases separation in rapidly quenched Nd[sub 60]Fe[sub 30]Al[sub 10] samples. Magnetic neutron scattering analysis reveals magnetic correlation volumes in the ferromagnetic phase of about 34 nm in diameter. Random anisotropy and a domain-wall pinning process within the two phases are discussed to explain the magnetic properties of amorphous Nd[sub 60]Fe[sub 30]Al[sub 10].


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