Details
| Original language | English |
|---|---|
| Article number | 602 |
| Pages (from-to) | 602 |
| Number of pages | 1 |
| Journal | Scientific reports |
| Volume | 10 |
| Issue number | 1 |
| Publication status | Published - 2020 |
Abstract
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 Fe 2.25Co 72.75Si 10B 15 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.
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In: Scientific reports, Vol. 10, No. 1, 602, 2020, p. 602.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Colossal heating efficiency via eddy currents in amorphous microwires with nearly zero magnetostriction
AU - Morales, Irene
AU - Archilla, Diego
AU - de la Presa, Patricia
AU - Hernando, Antonio
AU - Marin, Pilar
N1 - Publisher Copyright: © 2020, The Author(s).
PY - 2020
Y1 - 2020
N2 - 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 Fe 2.25Co 72.75Si 10B 15 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.
AB - 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 Fe 2.25Co 72.75Si 10B 15 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.
UR - http://www.scopus.com/inward/record.url?scp=85078006075&partnerID=8YFLogxK
U2 - 10.1038/s41598-020-57434-8
DO - 10.1038/s41598-020-57434-8
M3 - Article
VL - 10
SP - 602
JO - Scientific reports
JF - Scientific reports
SN - 2045-2322
IS - 1
M1 - 602
ER -