We report on the fabrication of microfluidic channels in fused silica using femtosecond laser irradiation followed by chemical etching. Using an astigmatically shaped beam, we achieve microchannels with circular cross section and length up to 1.5mm. We use the same femtosecond laser, with different irradiation parameters, to fabricate high quality optical waveguides on the same substrate. The integration of microchannels and waveguides will enable a forthcoming class of biophotonic sensors.

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In this letter, we report that pure cobalt can be prepared with the easy axes of magnetization normal to the film plane. This unusual condition is achieved through an electroplated columnar growth that produces needlelike crystallites with their hexagonal close-packed (hcp) c axes parallel to the growth direction. The magnetic properties of these films make them ideal candidates for vertical magnetic recording.