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Colossal heating efficiency via eddy currents in amorphous microwires with nearly zero magnetostriction.
Scientific Reports ( IF 3.8 ) Pub Date : 2020-01-17 , DOI: 10.1038/s41598-020-57434-8 Irene Morales 1 , Diego Archilla 1 , Patricia de la Presa 1, 2 , Antonio Hernando 1, 2, 3 , Pilar Marin 1, 2
Scientific Reports ( IF 3.8 ) Pub Date : 2020-01-17 , DOI: 10.1038/s41598-020-57434-8 Irene Morales 1 , Diego Archilla 1 , Patricia de la Presa 1, 2 , Antonio Hernando 1, 2, 3 , Pilar Marin 1, 2
Affiliation
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It is well stablished that heating efficiency of magnetic nanoparticles under radiofrequency fields is due to the hysteresis power losses. In the case of microwires (MWs), it is not clear at all since they undergo non-coherent reversal mechanisms that decrease the coercive field and, consequently, the heating efficiency should be much smaller than the nanoparticles. However, colossal heating efficiency has been observed in MWs with values ranging from 1000 to 2800 W/g, depending on length and number of microwires, at field as low as H = 36 Oe at f = 625 kHz. It is inferred that this colossal heating is due to the Joule effect originated by the eddy currents induced by the induction field B = M + χH parallel to longitudinal axis. This effect is observed in MWs with nearly zero magnetostrictive constant as Fe2.25Co72.75Si10B15 of 30 μm magnetic diameter and 5 mm length, a length for which the inner core domain of the MWs becomes axial. This colossal heating is reached with only 24 W of power supplied making these MWs very promising for inductive heating applications at a very low energy cost.
中文翻译：
磁致伸缩几乎为零的非晶微丝中通过涡流产生的巨大加热效率。
充分确定的是，射频场下磁性纳米粒子的加热效率归因于磁滞功率损耗。对于微丝（MWs），完全不清楚，因为它们会经历非相干反转机制，从而降低矫顽场，因此加热效率应远小于纳米粒子。然而，在f = 625 kHz时低至H = 36 Oe的场中，已经观察到巨大的加热效率，单位为MWs，取值范围为1000至2800 W / g，具体取决于微丝的长度和数量。可以推断，这种巨大的加热是由于焦耳效应引起的，该焦耳效应是由平行于纵轴的感应场B = M +χH感应的涡流所产生的。在具有接近零的磁致伸缩常数作为Fe2.25Co72的MW中观察到了这种效应。75Si10B15的磁直径为30μm，长度为5 mm，是MWs的内核区域变为轴向的长度。仅通过提供24 W的功率就可以达到这种巨大的加热效果，这使得这些MW以非常低的能源成本非常适合感应加热应用。
更新日期：2020-01-17
中文翻译：
磁致伸缩几乎为零的非晶微丝中通过涡流产生的巨大加热效率。
充分确定的是，射频场下磁性纳米粒子的加热效率归因于磁滞功率损耗。对于微丝（MWs），完全不清楚，因为它们会经历非相干反转机制，从而降低矫顽场，因此加热效率应远小于纳米粒子。然而，在f = 625 kHz时低至H = 36 Oe的场中，已经观察到巨大的加热效率，单位为MWs，取值范围为1000至2800 W / g，具体取决于微丝的长度和数量。可以推断，这种巨大的加热是由于焦耳效应引起的，该焦耳效应是由平行于纵轴的感应场B = M +χH感应的涡流所产生的。在具有接近零的磁致伸缩常数作为Fe2.25Co72的MW中观察到了这种效应。75Si10B15的磁直径为30μm，长度为5 mm，是MWs的内核区域变为轴向的长度。仅通过提供24 W的功率就可以达到这种巨大的加热效果，这使得这些MW以非常低的能源成本非常适合感应加热应用。
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