M�ssbauer effect studies of amorphous metals in magnetic radiofrequency fields

Kopcewicz, M.

doi:10.1007/bf00672228

Cited by 19 publications

(35 citation statements)

References 51 publications

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“…A collapse of the magnetic hyperfine field arises from a fast periodic switching of the magnetization [12,13]. The sideband effect originates from acoustic vibrations induced by magnetostriction [13,14]. Also Rabi oscillations have been observed where the rf field directly couples to the nuclear transition [15].…”

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confidence: 99%

Spin Precession Mapping at Ferromagnetic Resonance via Nuclear Resonant Scattering of Synchrotron Radiation

et al. 2015

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We probe the spin dynamics in a thin magnetic film at ferromagnetic resonance by nuclear resonant scattering of synchrotron radiation at the 14.4 keV resonance of 57 Fe. The precession of the magnetization leads to an apparent reduction of the magnetic hyperfine field acting at the 57 Fe nuclei. The spin dynamics is described in a stochastic relaxation model adapted to the ferromagnetic resonance theory by Smit and Beljers to model the decay of the excited nuclear state. From the fits of the measured data the shape of the precession cone of the spins is determined. Our results open a new perspective to determine magnetization dynamics in layered structures with very high depth resolution by employing ultrathin isotopic probe layers.

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confidence: 99%

Spin Precession Mapping at Ferromagnetic Resonance via Nuclear Resonant Scattering of Synchrotron Radiation

et al. 2015

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“…3b). The central doublet is accompanied by the rf-sidebands that are directly related to magnetostriction of the alloy [10]. The absorption lines of the rf-collapsed doublet narrow with the increase of the rf eld intensity and stabilize at about 10 Oe (Fig.…”

Section: Boron-freementioning

confidence: 95%

Mössbauer Study of Magnetic Properties of Fe_80-xCo_xZr₇Si₁₃(x = 0-30 at.%) Boron-Free Amorphous Alloys

et al. 2012

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Amorphous Fe80−xCoxZr7Si13 (x = 030 at.%) alloys in which boron was completely replaced by silicon as a glass forming element have been prepared by melt quenching. Partial substitution of iron by cobalt caused the increase of the hyperne eld and saturation magnetization. The specialized rf-Mössbauer measurements revealed that all amorphous alloys studied are magnetically very soft. The rf-sidebands eect, related to magnetostriction, increases with the increase of Co content. In Fe50Co30Zr7Si13 sample the rf eld exposure induced partial crystallization of amorphous phase that was attributed to mechanical deformations related to high frequency magnetostrictive vibrations induced by the rf eld. The measurements of the hysteresis loop revealed that coercivity increases for higher Co content.

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“…The rf side bands disappear when magnetostriction vanishes. The rf collapse and side band effects are reviewed extensively elsewhere [43,[49][50][51]. The rf-Mössbauer technique was recently successfully applied to the study of FeCuNbSiB [52,53] and FeZrBCu alloys [31-33, 36, 37].…”

Section: Rf-mössbauer Studiesmentioning

confidence: 99%

“…As a result of fast magnetization reversal the hyperfine field vanishes despite the fact that the sample remains in the ferromagnetic state, as evidenced by the presence of rf side bands in the rf collapsed spectra. The side bands, related directly to magnetostriction, appear only in the ferromagnetic state [43,[46][47][48][49][50][51]. The characteristic features of the rf collapsed spectra remain almost unchanged as long as the alloys are in the amorphous state, i.e.…”

Section: Rf-mössbauer Studiesmentioning

confidence: 99%

Mössbauer Study of Nanocrystalline Alloys

Kopcewicz

1999

Acta Phys. Pol. A

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The current status of the Mössbauer investigations of the soft magnetic nanocrystalline alloys produced by utilizing the first step of crystallization of the amorphous alloys such as FeCuNbSiB and FeZrBCu is reviewed. Conventional Mössbauer measurements allow the identification of phases formed • due to annealing of the amorphous precursor and the evaluation of their relative content. The unconventional rf-Mössbauer technique, in which the rf collapse and sideband effects are employed, permits us to distinguish the magnetically soft nanocrystalline bcc-Fe phase from the magnetically harder microcrystalline Fe. Qualitative information concerning the distribution of anisotropy fields in the nanocrystalline grains can be inferred from the dependence of the rf collapsed spectra on the rf field intensity. The rf-sidebands effect reveals strong reduction of magnetostriction due to the formation of the nanocrystalline phase. The rf-Mössbauer technique provides a unique opportunity to study the microstructure and magnetic properties of each phase formed in the amorphous precursor.

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M�ssbauer effect studies of amorphous metals in magnetic radiofrequency fields

Cited by 19 publications

References 51 publications

Spin Precession Mapping at Ferromagnetic Resonance via Nuclear Resonant Scattering of Synchrotron Radiation

Spin Precession Mapping at Ferromagnetic Resonance via Nuclear Resonant Scattering of Synchrotron Radiation

Mössbauer Study of Magnetic Properties of Fe_80-xCo_xZr₇Si₁₃(x = 0-30 at.%) Boron-Free Amorphous Alloys

Mössbauer Study of Nanocrystalline Alloys

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M�ssbauer effect studies of amorphous metals in magnetic radiofrequency fields

Cited by 19 publications

References 51 publications

Spin Precession Mapping at Ferromagnetic Resonance via Nuclear Resonant Scattering of Synchrotron Radiation

Spin Precession Mapping at Ferromagnetic Resonance via Nuclear Resonant Scattering of Synchrotron Radiation

Mössbauer Study of Magnetic Properties of Fe80-xCoxZr7Si13(x = 0-30 at.%) Boron-Free Amorphous Alloys

Mössbauer Study of Nanocrystalline Alloys

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Mössbauer Study of Magnetic Properties of Fe_80-xCo_xZr₇Si₁₃(x = 0-30 at.%) Boron-Free Amorphous Alloys