We have studied the magnetic and magnetotransport properties of melt-spun Fe91Zr8Cu1 and Fe81Zr8Cu1Ru10. The Fe91Zr8Cu1 alloy after nanocrystallization at 753 K for 14.4 ks shows conventional anisotropic magnetoresistance (MR). On the other hand, spin-dependent MR (Δρ≈-0.04 μΩ cm) is confirmed for the Fe81Zr8Cu1Ru10 alloy after the same nanocrystallization treatment. Our 57Fe Mössbauer results indicate that the residual amorphous phase in the Ru-free alloy is ferromagnetic, whereas that in the Ru-doped alloy is paramagnetic. The spin-dependent MR in Fe81Zr8Cu1Ru10 is considered to be due to the inhibition of the intergranular magnetic coupling by this paramagnetic amorphous phase. Our study shows that the magnetotransport in BCC-Fe/amorphous two-phase nanocrystalline systems can be spin-dependent.
- Magnetoresistance - melt-spun ribbons
- Mössbauer spectroscopy