Magnetoresistance at Room Temperature of Oleic Acid Coated Fe_3-xCo_xO₄ (x = 0, 0.1 and 0.3) Nanocrystal Drop-Cast Films

抄録

Oleic acid coated Fe_3-xCo_xO₄ (x = 0, 0.1 and 0.3) nanocrystal self-assembled films were fabricated via drop-casting of colloidal particles on a SiO₂/Si substrate. Nanocrystals of the Fe_3-xCo_xO₄ exhibited bifurcation of the zero-field-cooled and field-cooled magnetizations at 300 K. The Fe_3-xCo_xO₄ nanocrystal drop-cast films demonstrated nonlinear current-voltage characteristics between the source and drain electrodes in magnetic fields of zero and 0.2 T, and magnetoresistance reached into −46% for the x = 0 film and −50% for both the x = 0.1 and 0.3 films at 300 K. Oleic acid coated Fe_3-xCo_xO₄ (x = 0.1 and 0.3) nanocrystal would boost developments of a high performance current switching device using negative magnetoresistance.