Magnetocaloric effect and temperature -dependent magnetoresistance in Cu-doped FeCoNiBSiNb amorphous alloys
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Date
2017-05-24
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Elsevier
Abstract
In this work, magnetocaloric and magnetoresistance properties of Fe-based (Fe(0.402)Co(0.201)Ni(0.067)Bo(0.227)Si(0.053)Nb(0.05))(100-x)Cu-x (x = 0, 0.5, 0.75, 1) amorphous ribbons formed by melt-spinning method and the effect of Cu on these properties were investigated. Curie temperature (T-C) was not changed with the addition of Cu up to 0.5% to the composition. On the other hand, for Fe-based (Fe(0.402)Co(0.201)Ni(0.067)Bo(0.227)Si(0.053)Nb(0.05))(100-x)Cu-x (x = 0.75 and 1), T-C increased from 505 K (for x = 0.5) to 526 K (for x = 0.75) and almost remain constant for x = 1. Maximum magnetic entropy change (-Delta S-M)(max) and refrigeration capacity (RC) values were found to be in the range of 0.62-1.25 Jkg(-1)K(-1) and 62-158.75 Jkg(-1) respectively for (Fe(0.402)Co(0.201)Ni(0.067)Bo(0.227)Si(0.053)Nb(0.05))(100-x)Cu-x (x = 0, 0.5, 0.75, 1) amorphous ribbons under a maximum field of 2 T. These values are comparable with those of previously studied Fe-based metallic glasses. In addition, the maximum temperature dependent magnetoresistance (MR (%)) values for (Fe(0.402)Co(0.201)Ni(0.067)Bo(0.227)Si(0.053)Nb(0.05))(100-x)Cu-x (x = 0, 0.5, 0.75, 1) were found to be 125, 17, 7, and 1% around the Curie temperatures under an applied field of 1 T, respectively. The magnetoresistance values of Cu-free Fe-based glassy alloy are higher than those of Cu-doped alloys. The results show that appropriate amount of Cu substitution (x = 0.75, 1) can enhance the RC and (-Delta S-M)(max). The suitable RC, large magnetoresistance, good thermal stability, and negligible hysteresis offer that these Fe-based glassy alloys exhibit promising applications as high-temperature magnetic refrigerants and multifunctional materials working in the temperature range of 400-600 K.
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Materials science, Magnetic entropy change, Magnetocaloric effect, Metallic glasses, Temperature-dependent magnetoresistance, Bulk metallic glasses, Magnetic entropy change, Room-temperature, Forming ability, Refrigeration, Transition, Fe, Si, Amorphous alloys, Amorphous silicon, Copper, Curie temperature, Entropy, Functional materials, Galvanomagnetic effects, Glass, High temperature applications, Magnetism, Magnetocaloric effects, Magnetoresistance, Melt spinning, Metallic glass, Nickel, Silicon, Fe-based metallic glass, Magnetic entropy change, Magnetic refrigerants, Magnetoresistance properties, Maximum temperature, Refrigeration capacity, Temperature dependent, Temperature range, Copper alloys
Citation
Şarlar, K. vd. (2017). ''Magnetocaloric effect and temperature -dependent magnetoresistance in Cu-doped FeCoNiBSiNb amorphous alloys''. Journal of Non-Crystalline Solids, 471, 169-174.