Correlations between low-field microwave absorption and magnetoimpedance in Co-based amorphous ribbons

Montiel, H.; Alvarez, G.; Betancourt, I.; Zamorano, R.; Valenzuela, R.

doi:10.1063/1.1861959

Cited by 65 publications

(72 citation statements)

References 14 publications

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“…This indicates that the LFMA has microwave absorption minimum at zero field in contrast to the microwave absorption maximum for the FMR line at its resonance field. This is similar to the LFMA in Co-based ribbons as reported by Montiel et al [8]. LFMA is understood to be connected to the magnetization processes that occur at applied low field.…”

Section: Resultssupporting

confidence: 65%

“…Montiel et al have reported a strong correlation between LFMA and giant magneto impedance (GMI) phenomenon mostly in Co-based amorphous ribbons [8]. By using complex Poynting vector Alvarez et.al [15] showed a theoretical correlation between LFMA and magneto impedance (MI) as given by the following relationship.…”

Section: Introductionmentioning

confidence: 99%

“…For doped silicate glasses LFMA signal is due to magneto-induced microwave conductivity in the dielectric glass which derives from spindependent charge migration within the first co-ordination of paramagnetic ion [14]. For soft magnetic materials the LFMA signal is due to low-field spin magnetization processes [8].…”

Section: Introductionmentioning

confidence: 99%

“…A relatively new phenomenon called low-field microwave absorption (LFMA) -Microwave power absorption (MPA) centered at zero magnetic field (B = 0) has been observed in ferromagnetic materials and various other materials such as high temperature superconductors, ferrites, manganites, semiconductors, doped silicate glasses and in soft magnetic materials [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Low-field microwave absorption in pulse laser deposited FeSi thin film

Gavi¹,

Ngom²,

Beye³

et al. 2012

Journal of Magnetism and Magnetic Materials

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Low field microwave absorption (LFMA) measurements at 9.4 GHz (X-band), were carried out on pulse laser deposited (PLD) polycrystalline B20 cubic structure FeSi thin film grown on Si(111) substrate. The LFMA properties of the films were investigated as a function of DC field, temperature, microwave power and the orientation of DC field with respect to the film surface. The LFMA signal is very strong when the DC field is parallel to the film surface and vanishes at higher angles. The LFMA signal strength increases as the microwave power is increased. The LFMA signal disappears around 340 K, which can be attributed to the disappearance of ferromagnetic state well above room temperature in these films. We believe that domain structure evolution in low fields, which in turn modifies the low field permeability as well as the anisotropy could be the origin of the LFMA observed in these films. The observation of LFMA opens the possibility of the FeSi films to be used as low magnetic field sensors in the microwave and rf frequency regions.

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Section: Resultssupporting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Low-field microwave absorption in pulse laser deposited FeSi thin film

Gavi¹,

Ngom²,

Beye³

et al. 2012

Journal of Magnetism and Magnetic Materials

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“…Recent results show [18] that as frequency increases (in the 200 MHz -6 GHz range for Co-rich amorphous ribbons), a divergence in the MI response appears with two maxima in the impedance response, corresponding to ±H K (the value of which remains virtually constant at all frequencies), and the FMR response, which becomes field dependent, with a Larmor relation that depends on the geometry of the sample. FMR experiments in Co-rich amorphous ribbons at even higher frequencies (X-band at 9.4 GHz) have exhibited both signals clearly resolved [19], the non-resonant low-field absorption (LFA) similar to MI at fields lower than 50 Oe, and the expected FMR absorption at 1,682 Oe. Therefore our present results show the beginning of this separation.…”

Section: Experimental Results and Modelingmentioning

confidence: 99%

Effect of the metal-to-wire ratio on the high-frequency magnetoimpedance of glass-coated CoFeBSi amorphous microwires

Valenzuela

Fessant²,

Gieraltowski³

et al. 2008

Sensors and Actuators A: Physical

Self Cite

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High frequency [1-500 MHz] measurements of the magnetoimpedance (MI) of glass-coated Co69.4Fe3.7B15.9Si11 microwires are carried out with various metal-to-wire diameter ratios. A twinpeak, anhysteretic behaviour is observed as a function of magnetic field. A maximum in the normalized impedance, ∆Z/Z, appears at different values of the frequency f , 125, 140 and 85 MHz with the corresponding diameter ratio p = 0.80, 0.55 and 0.32. We describe the measurement technique and interpret our results with a thermodynamic model that leads to a clearer view of the effects of p on the maximum value of MI and the anisotropy field. The behavior of the real and imaginary components of impedance is also investigated; they display a resonance that becomes a function of the DC field HDC for values larger or equal to HK the circumferential anisotropy field for each p value. These results are interpreted in terms of a rotation model of the outer shell magnetization.

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Advanced Magnetic Microwires

Vázquez

2007

Handbook of Magnetism and Advanced Magnetic Materials

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The most relevant aspects of magnetic amorphous microwires are collected in this chapter from production and processing methods to micromagnetic magnetization reversal processes, including selected technological applications finally paying particular attention to the actual search for novel microwire materials. After a first general review of the present state of the art in Section 1, the fabrication of amorphous and nanocrystalline microwires by rapid solidification techniques and subsequent processing is described in Section 2, including important characteristics such as mechanical stress distribution. Section 3 reviews the most interesting magnetic features of positive magnetostriction, Fe‐based microwires with bistable magnetic behavior such as: domain structure, magnetization reversal mechanism and its dynamics, magnetoelastic behavior, magnetostatic interactions in arrays of bistable microwires, and applications. Section 4 is devoted to the circular magnetization process and magnetoimpedance effect of nonmagnetostrictive microwires, the microwave properties, and their applications. Finally, Section 5 summarizes the latest results obtained in the search for novel microwires with new and/or optimized properties: nanocomposite and multilayer microwires.

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Correlations between low-field microwave absorption and magnetoimpedance in Co-based amorphous ribbons

Cited by 65 publications

References 14 publications

Low-field microwave absorption in pulse laser deposited FeSi thin film

Low-field microwave absorption in pulse laser deposited FeSi thin film

Effect of the metal-to-wire ratio on the high-frequency magnetoimpedance of glass-coated CoFeBSi amorphous microwires

Advanced Magnetic Microwires

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