Thin Pt films on an yttrium iron garnet (YIG = Y(3)Fe(5)O(12)) show ferromagneticlike transport properties, which may impact the functionality of Pt in spin current detection, but do not provide direct quantitative information on the Pt magnetization. We report magnetic x-ray magnetic circular dichroism measurements of YIG/Pt(1.5 nm) showing an average Pt moment of 0.054 μ(B) at 300 K and 0.076 μ(B) at 20 K. This observation indicates strong proximity effects and induced magnetic ordering in Pt on magnetic insulators and their contribution to the spin-related measurements should not be neglected. The transport characteristics also suggest considerable modifications in the Pt electronic structure due to magnetic ordering.

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Magnetite (Fe 3 O 4 ) particles have been electrochemically synthesized on self-supported carbon nanofiber (CNF) buckypaper. The Fe 3 O 4 crystals can be obtained by electrodeposition within a certain potential window with particle size controlled by the deposition time and confirmed by x-ray photoelectron spectroscopy (XPS), x-ray diffraction, and scanning electron microscopy (SEM). The magnetic properties of the Fe 3 O 4 buckypaper composite materials demonstrated a well-defined particle structure had been achieved. Electrochemical synthesis has been proven to be a cost-effective, high throughput, and highly efficient approach in fabricating Fe 3 O 4 /buckypaper composite nanostructures.

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