The magnetocaloric and magnetoresistance properties of amorphous Co-based (Co 0.402 Fe 0.201 Ni 0.067 B 0.227 Si 0.053 Nb 0.05 ) 100−x Cu x (x = 0, 0.5, 0.75 and 1) ribbons were investigated. Cu additions changed the crystallisation temperature (T x ) and the Curie temperature (T C ). The saturation magnetisation (M s ) and coercivity (H c ) for alloys were in the range of 65.51-38.49 emu/g and 1.99-6.84 A/m, respectively. Under an applied magnetic field change of 2.2 T, the (−ΔS M ) max for (Co 0.402 Fe 0.201 Ni 0.067 B 0.227 Si 0.053 Nb 0.05 ) 100−x Cu x with x = 0, 0.5, 0.75 and 1 are 0.77, 0.71, 0.89 and 0.67 Jkg −1 K −1 , respectively. The values of refrigeration capacity (RC) for the as-spun glassy alloys are comparable with those of previously studied Fe-based metallic glasses such as Fe 80 B 10 Zr 9 Cu 1 , (Fe 0.76 B 0.24 ) 96 Nb 4 and Fe 82 Ni 2 Zr 6 B 10 . In addition, the maximum magnetoresistance (MR) values for (Co 0.402 Fe 0.201 Ni 0.067 B 0.227 Si 0.053 Nb 0.05 ) 100−x Cu x with x = 0, 0.5, 0.75 and 1 are found to be 110, 38, 23 and 1% around the Curie temperatures under an applied magnetic field change of 1 T, respectively. With good RC, negligible hysteresis due to very low coercivity values and large magnetoresistance, these Co-based amorphous alloys can be used as the high temperature magnetic refrigerants and multifunctional applications working in the temperature range of 450-600 K.
We have studied polymer-free cladding power strippers for high-power fiber laser applications. A practical, rapid, and process-on-place chemical etching technique is presented to form surface roughness for efficient removal of the cladding light. The technique is methodically studied and performance contours are determined for frequently used 130, 250, and 400 µm double-clad fibers. The stripping efficiency and the thermal performance of the fabricated strippers are investigated with respect to such process parameters as etching time and etched fiber length. At least 15 dB attenuation with
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