Study of the nanocrystalline Fe{sub 73.5}Nb{sub 4.5}Cr{sub 5}Cu{sub 1}B{sub 16} alloy by the radio-frequency-M{umlt o}ssbauer technique
- Institute of Electronic Materials Technology, Wolczynska 133, 01-919 Warszawa (Poland)
- Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 043 53 Kosice (Slovakia)
The influence of Cr on the structural and magnetic properties of iron based amorphous and nanocrystalline alloys is studied for the Fe{sub 73.5}Nb{sub 4.5}Cr{sub 5}Cu{sub 1}B{sub 16} alloy by an unconventional technique which combines the M{umlt o}ssbauer spectroscopy with the effects induced by the radio-frequency (rf) magnetic fields (rf collapse and rf sideband effects). The nanocrystalline bcc-Fe phase, formed by annealing the amorphous precursor for 1 h at temperatures 490{degree}C{endash}550{degree}C, was embedded in the retained amorphous matrix. The conventional M{umlt o}ssbauer measurements allowed the identification of three types of phases in the nanocrystalline alloy: (i) the retained amorphous matrix, (ii) the nanocrystalline bcc-Fe phase, whose abundance increased with increasing annealing temperature, and (iii) the interfacial phase formed at the bcc-Fe grain boundaries. The rf collapse effect observed in the M{umlt o}ssbauer spectra of the samples exposed to the rf field of 60.9 MHz permits the study of the magnetic anisotropy in all phases present. The rf collapse effect occurs only in the amorphous phase, thus revealing that the magnetic anisotropy of the amorphous matrix is significantly smaller than that encountered in the nanocrystalline phase. The rf-M{umlt o}ssbauer experiments performed as a function of the rf field intensity allowed the determination of the distributions of the anisotropy fields in the nanocrystalline-amorphous composite alloy. The rf sidebands effect reveals a strong reduction of magnetostriction related to the formation of the nanocrystalline phase. {copyright} {ital 1998 American Institute of Physics.}
- OSTI ID:
- 565660
- Journal Information:
- Journal of Applied Physics, Vol. 83, Issue 2; Other Information: PBD: Jan 1998
- Country of Publication:
- United States
- Language:
- English
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