Anomalous eddy currents in magnetostrictive amorphous ferromagnets: A large contribution from magnetoelastic effects

Hernando, A.; Madurga, V.; Barandiarán, J.M.; Liniers, M.

doi:10.1016/0304-8853(82)90034-8

Cited by 25 publications

(10 citation statements)

References 9 publications

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“…In 1978 Savage et al [25] derived the following expression for the susceptibility around the magnetoelastic resonance in a free-standing cylinder-shaped sample:

χ (ω) = χ_{0} [1 - \frac{8 k^{2}}{π^{2}} \sum_{n} \frac{1}{n^{2}} \times \frac{1}{1 - \frac{ω_{n}^{2}}{ω^{2}} + i Q^{- 1} \frac{ω_{n}}{ω}}],

where

k

is the magnetoelastic coupling coefficient,

ω_{n} = 2 π f_{n}

is the frequency of the n th harmonic of the excited fundamental mode (

n = 1

Q^{- 1}

is a phenomenological damping coefficient, and

χ_{0}

is the magnetic susceptibility measured at a frequency far below the resonance [26]. Equation (4) also applies to rectangular section ribbons with a proper choice of the

k

factor.…”

Section: Results: Determination Of the Q Quality Factor Valuementioning

confidence: 99%

Accurate Determination of the Q Quality Factor in Magnetoelastic Resonant Platforms for Advanced Biological Detection

Lopes

Sagasti

Lasheras

et al. 2018

Sensors

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The main parameters of magnetoelastic resonators in the detection of chemical (i.e., salts, gases, etc.) or biological (i.e., bacteria, phages, etc.) agents are the sensitivity S (or external agent change magnitude per Hz change in the resonance frequency) and the quality factor Q of the resonance. We present an extensive study on the experimental determination of the Q factor in such magnetoelastic resonant platforms, using three different strategies: (a) analyzing the real and imaginary components of the susceptibility at resonance; (b) numerical fitting of the modulus of the susceptibility; (c) using an exact mathematical expression for the real part of the susceptibility. Q values obtained by the three methods are analyzed and discussed, aiming to establish the most adequate one to accurately determine the quality factor of the magnetoelastic resonance.

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“…In 1978 Savage et al [25] derived the following expression for the susceptibility around the magnetoelastic resonance in a free-standing cylinder-shaped sample:

χ (ω) = χ_{0} [1 - \frac{8 k^{2}}{π^{2}} \sum_{n} \frac{1}{n^{2}} \times \frac{1}{1 - \frac{ω_{n}^{2}}{ω^{2}} + i Q^{- 1} \frac{ω_{n}}{ω}}],

where

k

is the magnetoelastic coupling coefficient,

ω_{n} = 2 π f_{n}

is the frequency of the n th harmonic of the excited fundamental mode (

n = 1

Q^{- 1}

is a phenomenological damping coefficient, and

χ_{0}

is the magnetic susceptibility measured at a frequency far below the resonance [26]. Equation (4) also applies to rectangular section ribbons with a proper choice of the

k

factor.…”

Section: Results: Determination Of the Q Quality Factor Valuementioning

confidence: 99%

Accurate Determination of the Q Quality Factor in Magnetoelastic Resonant Platforms for Advanced Biological Detection

Lopes

Sagasti

Lasheras

et al. 2018

Sensors

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“…The induced magnetic field inside the NWs always opposes to the change of magnetization, especially at high frequency, and the eddy current losses can be significant 51 . As frequency increases, the eddy-current is damped away and the effective resistance increases because the effective area decreases, consequently, this skin effect causes a heating increase.…”

Section: Discussionmentioning

confidence: 99%

Colossal heating efficiency via eddy currents in amorphous microwires with nearly zero magnetostriction

Morales

Archilla

Presa

et al. 2020

Sci Rep

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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.

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“…Cela semble montrer que la fréquence de vibration a une influence sur la saturation du matériau. Ces résultats peuvent être rapprochés de ce qu'observent Hernando et al sur du metglas 2826 [18]. Il faut remarquer égalelement que la déformée de la lame vibrante est différente pour les deux modes de vibration.…”

Section: Discussionunclassified

Comportement micromécanique d'un verre métallique Fe-B-Si-C chargé en hydrogène

Allemand

Fouquet

Pérez

1986

Rev. Phys. Appl. (Paris)

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2014 Les verres métalliques ferromagnétiques et magnétostrictifs soumis à une contrainte cyclique sont le siège d'un effet magnétoélastique, ou effet 0394E. En frottement intérieur, cet effet se caractérise par un amortissement d'ordre magnétomécanique. Ce comportement micromécanique a été suivi dans le cas d'un verre métallique base fer (Fe83B14Si1,5C1,5) en relation avec l'état structural du matériau. Par ailleurs, le chargement en hydrogène par voie électrolytique sur un tel matériau entraîne la mise en évidence d'un pic de frottement intérieur dont l'origine physique ne peut être uniquement liée au seul phénomène relaxationnel connu sous le nom de pic de Snoek. Il ressort de cette étude l'existence d'une interaction importante entre les parois de domaines ferromagnétiques et les atomes d'hydrogène ainsi que d'une redistribution ou réorientation des atomes d'hydrogène sous l'effet d'un champ magnétique, liée à la nature magnétostrictive du matériau. Abstract. 2014 When a cyclic stress is applied, ferromagnetic and magnetostrictive metallic glasses exhibit a magnetoelastic effect or 0394E-effect. Such an effect is associated to a magnetomechanical damping. This micromechanical behaviour has been studied in the case of an iron-based amorphous alloy (Fe83B14Si1.5C1.5), as a function of the structural state of the material. On the other hand, after electrolytically introducing hydrogen, an internal friction peak is observed. The physical processus leading to such a peak cannot only be attributed to the relaxational phenomenon well known as Snoek peak. A strong interaction between ferromagnetic domain walls and hydrogen atoms and a redistribution or a reorientation of hydrogen atoms under magnetic field, due to the magnetostrictive property of the material, are suggested in order to explain all the expérimental features.

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Anomalous eddy currents in magnetostrictive amorphous ferromagnets: A large contribution from magnetoelastic effects

Cited by 25 publications

References 9 publications

Accurate Determination of the Q Quality Factor in Magnetoelastic Resonant Platforms for Advanced Biological Detection

Accurate Determination of the Q Quality Factor in Magnetoelastic Resonant Platforms for Advanced Biological Detection

Colossal heating efficiency via eddy currents in amorphous microwires with nearly zero magnetostriction

Comportement micromécanique d'un verre métallique Fe-B-Si-C chargé en hydrogène

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