Biased magnetization reversal in bi-phase multilayer microwires

Badini-Confalonieri, G. A.; Infante, G.; Torrejón, Jacob; Vázquez, M.

doi:10.1016/j.jmmm.2008.04.033

Cited by 13 publications

(9 citation statements)

References 25 publications

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“…This is understood to be a consequence of the magnetoelastic anisotropy induced by the stresses CoNi , due to the presence of the CoNi shell, as has also been concluded from low-frequency studies. 18 An estimation of that stress can be performed considering the relationship CoNi = 0 M s ⌬H k / 3 s , which results in CoNi Ϸ 120 MPa for the Fe-based microwire with s =3ϫ 10 −5 for a CoNi layer thickness of t CoNi =3 m.…”

Section: Resultsmentioning

confidence: 99%

Double-absorption ferromagnetic resonance in biphase magnetic microwires

Torrejón

Badini-Confalonieri

Vázquez

2009

Journal of Applied Physics

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We report a ferromagnetic resonance study of biphase magnetic microwires consisting of soft amorphous nucleus, intermediate nonmagnetic layers, and harder outer crystalline shell. Real and imaginary impedance components are investigated under increasing static axial magnetic field with a network analyzer in the microwave frequency range for selected microwires with different soft nuclei. Natural ferromagnetic resonance is even observed for particular microwires with strong axial anisotropy. The presence of a hard phase induces a second absorption peak at frequencies lower than those of the soft phase. Moreover, magnetic anisotropy of different soft phases is deduced from the evolution of resonance frequency with applied field.

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Section: Resultsmentioning

confidence: 99%

Double-absorption ferromagnetic resonance in biphase magnetic microwires

Torrejón

Badini-Confalonieri

Vázquez

2009

Journal of Applied Physics

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“…This is interpreted to be a consequence of the increasing mechanical stresses induced by the Pyrex coupled with the negative sign of magnetostriction. As has been previously reported, outer layers, magnetic or not, induce mechanical stress onto the inner magnetic nucleus giving rise to intrinsic magnetoelastic anisotropy 13.…”

Section: Low‐frequency Magnetic Characterizationmentioning

confidence: 52%

Microwave behavior in CoFe‐based single‐ and two‐phase magnetic microwires

Kammouni

Infante²,

Torrejón³

et al. 2010

Physica Status Solidi (a)

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The ferromagnetic resonance (FMR), spectra in the frequency range up to 12 GHz has been investigated as a function of applied DC magnetic field (up to 80 kA/m) for single‐phase CoFe‐based Pyrex‐coated microwire as well as for biphase microwires after depositing an outer shell, with hard (CoNi) and soft (FeNi) magnetic character, respectively. In addition, a parallel study on the low‐frequency magnetic hysteresis loop of all these samples has been performed. In particular, we have focused on the influence of the thickness of the insulating Pyrex layer and magnetic character of the outer magnetic phase. For single‐phase microwires, the increase of the Pyrex thickness results in a continuous strengthening of the circular magnetoelastic anisotropy of the CoFe‐based core as deduced from FMR and confirmed by low‐frequency measurements. For biphase microwires three absorption peaks are observed: two of them can be ascribed to each magnetic phase since FMR frequencies obey the Kittel condition for a thin film. A third absorption peak is observed at lower frequencies that does not follow such an equation and can be ascribed to a pure geometrical effect of these biphase microwires.

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“…Parallel to the magnetoelastic coupling, the magnetostatic interaction between magnetic phases can be relevant (Torrejon et al, 2007b;Badini-Confalonieri et al, 2008). Its origin is found in the uncompensated magnetic charges at the ends of a premagnetized harder phase.…”

Section: Static Magnetic Properties Of Biphase Microwiresmentioning

confidence: 99%

“…Its origin is found in the uncompensated magnetic charges at the ends of a premagnetized harder phase. This asymmetry can be explained by the stronger inhomogeneity of the bias field in the region close to the uncompensated charges, and it forces such a region to reverse by rotation instead of domain wall propagation (Badini-Confalonieri et al, 2008). Figure 9.6c shows the minor hysteresis loops of the FeSiB/CoNi microwire (t CoNi ¼ 2 mm) when the hard phase is demagnetized and premagnetized at AE80 kA m À1 , respectively.…”

Section: Static Magnetic Properties Of Biphase Microwiresmentioning

confidence: 99%