The rf–Mössbauer study of the magnetic properties of nanocrystalline alloys

Kopcewicz, M.

doi:10.1016/j.jallcom.2004.05.049

Cited by 9 publications

(2 citation statements)

References 22 publications

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“…The nanocrystalline phases were formed by controlled 1 h annealing in vacuum of amorphous precursors (annealing temperature: T a = 440-770°C). The rf-Mössbauer measurements were performed, in a similar way as in [3][4][5], during exposure of the samples to a radio frequency (rf) magnetic field of the frequency 61 MHz which intensity was varied between 0 and 20 Oe. The isomer shifts are related to the -Fe standard.…”

Section: Resultsmentioning

confidence: 99%

“…This technique, which combines the Mössbauer effect with the phenomena induced by the external radio-frequency (rf) magnetic field (the rf-collapse and rf-sideband effects), permits us to study changes of magnetic anisotropy and to follow the changes of magnetostriction associated with the formation of nanocrystalline grains. Recently, the rf-Mössbauer technique was applied successfully for studying nanocrystalline alloys [2,3] and is discussed in detail in ref. [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Magnetic properties of nanocrystalline FeNiCo x ZrB alloys (x=0, 10, 20)

2005

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Magnetic properties of amorphous and nanocrystalline Fe 31 Ni 50 Zr 7 B 12 , Fe 31 Ni 40 Co 10 Zr 7 B 12 and Fe 31 Ni 30 Co 20 Zr 7 B 12 alloys were studied by an unconventional "rfMössbauer" technique. Introduction of Co atoms into FeNiZrB alloy leads to a large increase of anisotropy field that suppresses the rf collapse effect. The rf induced crystallization effect observed in Co-containing alloys was attributed to the rf sidebands effect which induced in the alloys mechanical deformations via the magnetostriction. This effect is particularly strong in amorphous alloys and in nanocrystalline alloys containing significant fraction of amorphous matrix and is absent in Co-free alloy.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetic properties of nanocrystalline FeNiCo x ZrB alloys (x=0, 10, 20)

2005

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Crystallisation and magnetic behaviour of amorphous and nanocrystalline Fe_{81–x –y}Ni_xCo_yZr₇B₁₂ alloys

Kopcewicz

Latuch

Kulik

2007

Physica Status Solidi (a)

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The amorphous precursors Fe81–x –y Nix Coy Zr7B12 (x = 50, 40, 30, 20; y = 0, 10, 20), prepared by the melt quenching technique, have been characterised in terms of their ability to form nanocrystalline grains on annealing. The crystallisation process was studied in detail using Mössbauer spectroscopy, X‐ray diffraction (XRD) and differential scanning calorimetry measurements. The crystalline phases formed were identified and their transformation versus annealing temperature was followed. Bulk and surface crystallisation of amorphous precursors was compared using conversion electron Mössbauer spectroscopy. The size of nanograins was estimated from the XRD results using the Scherrer formula. The magnetic properties of amorphous and nanocrystalline Fe81–x –y Nix Coy Zr7B12 alloys were studied using an unconventional ‘rf‐Mössbauer’ technique. The rf‐Mössbauer technique provides information on the soft magnetic behaviour of alloys. The rf sidebands observed are directly related to magnetostriction and their presence provides a good test for the formation of the nanocrystalline alloy. The rf‐Mössbauer results revealed that the anisotropy field increased significantly with the introduction of Co. The rf‐Mössbauer measurements were accompanied by conventional measurements of hysteresis loops that fully supported the rf‐Mössbauer results. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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