Abstract
The microstructure and magnetic properties of the nanocrystalline bcc phase formed by annealing at 500–600°C of the amorphous Fe 81Zr 7B 12 and Fe 79Zr 7B 12Cu 2 alloys are studied using Mössbauer spectroscopy. The unconventional rf-Mössbauer experiments in which the radio frequency induced effects (rf collapse and rf sidebands) are used allow the nanocrystalline α-Fe phase to be distinguished from the magnetically harder microcrystalline α-Fe formed at higher annealing temperatures. The complete rf collapse of the magnetic hyperfine structure occurs only in the amorphous and nanocrystalline phases and is suppressed by the formation of microcrystalline α-Fe. The rf sidebands disappear when the nanocrystalline phase is formed revealing that magnetostriction vanishes. The rf-Mössbauer experiments performed as a function of the rf field intensity allowed the determination of the distribution of anisotropy fields related to the size distribution of the α-Fe grains.
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