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SEM image of the nanoparticles.
(Color online) (a) TEM image of -coated magnetite. (b) A partly enlarged image of (a). The insets show the EDS patterns taken on the magnetite nanoparticles.
Resistivtiy as a function of temperature in plot. is plotted in a logarithmic scale. -coated magnetite were sintered at (∎), (●), and (▴). The solid line denotes the pure magnetite compact sintered at .
MR as a function of applied magnetic field. Solid circle denotes the MR of -coated magnetite at 300, 200, and from top to bottom; solid line denotes the MR of uncoated magnetite at 300, 200, and from top to bottom.
Temperature dependence of MR at and the corresponding deduced spin polarization. The top inset shows the thickness dependence of low-field MR at . The bottom inset shows the sintering temperature dependence of low-field MR at .
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