| Description |
Disordered systems, because of their fascinating physical properties, have received considerable attention. We use standard magnetization and electronic transport properties as tools to study various disordered systems, namely random substitutional Ni-rich Ni-Fe-V, Ni-Fe-Mo, and Ni-Fe-W alloys, Co-rich Ni-Cr pseudo-binary amorphous alloys, self-assembled Ni-nanocrystallites, and Ni-Fe-Mo alloy thin films. We focus our study of magnetization to see the effect of Mo (4d) and W (5d) increment as well as Fe dilution in such alloy systems. The alloys show distinctive spin dynamics signatures associated with strongly coupled cluster spins. We have also studied their electronic transport properties as well as those of the Co-rich Ni-Cr amorphous alloys and Ni-nanocrystals. We have successfully separated contributions from the various electronic scattering processes in all the above disorder-driven systems. Finally we have studied a set of PLD grown thin films of Ni-Fe-Mo alloys to see the effect of size reduction as well as structural disorder on their magnetic properties.
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