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- W2017482802 abstract "It is well known that competing magnetic interactions in amorphous Fe-rich Fe-Zr alloys result in a ferromagnetic-like transition below room temperature (for example, Tc≊235 K for a Fe90Zr10 alloy). The field dependence of the ac response of such a system with competing interactions is thus complex, with the possible coexistence of ferromagnetic domains and spin freezing processes. One consequence of this is the observed1 Hopkinson peak in ac susceptibility and its strong field dependence when measured at ordinary fields (≳80 A/m). The existence of such a complex Hopkinson peak, which arises from the contribution of domain wall motion and hysteretic effects, makes it very difficult to identify, unambiguously, a spin freezing temperature. The purpose of this paper is to clarify this point. Complex ac susceptibility [χ′(T), χ″(T)] measurements have been carried out over an extended range of field amplitude (0.08–8000 A/m) and three decades of frequency (1–1000 Hz) along the axis of a single sample of melt spun Fe90Zr10 ribbon. We find that, below the threshold field, there is a unique spin freezing temperature with almost no frequency or field dependence. At higher fields (≳80 A/m) the viscous susceptibility, χ″(T), peak at low temperatures shows a strong temperature, frequency, and field dependence, indicating a superposition of the effects of ‘‘induced’’ long range order with the spinglass state. The ferro-to-spin glass transition temperature using this approach has been found to be Tsf=25 K." @default.
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- W2017482802 title "The frequency dependence of the ferro-to-spinglass transition of amorphous Fe-rich Fe-Zr (abstract)" @default.
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- W2017482802 doi "https://doi.org/10.1063/1.355541" @default.
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