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rf-Mössbauer study of the magnetic properties of nanocrystalline FeNiZrB and FeNiCoZrB alloys

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2 Author(s)
Kopcewicz, M. ; Institute of Electronic Materials Technology, Wólczyńska 133, Warszawa, Poland ; Kulik, T.

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Magnetic properties of amorphous and nanocrystalline Fe31Ni50Zr7B12 and Fe41Ni40-xCoxZr7B12 (x=10,20) alloys are studied by an unconventional “rf-Mössbauer” technique. The introduction of Co atoms into FeNiZrB amorphous and nanocrystalline alloys leads to a large increase of anisotropy field that limits the rf-collapse effect. The rf-Mössbauer measurements are very useful for the estimation of magnetic anisotropy field. The rf sidebands vanish when the nanocrystalline structure is formed. The rf-induced crystallization effect observed in Co-containing alloys is particularly strong in magnetostrictive amorphous alloys and in nanocrystalline alloys containing significant fraction of amorphous matrix. This effect does not occur in Co-free alloy.

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Journal of Applied Physics  (Volume:99 ,  Issue: 8 )