Hyperfine field distributions and transverse spin freezing in iron-rich amorphous Fe-Zr alloys

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Abstract
In order to settle the question of homogeneous versus inhomogeneous ordering in amorphous Fe-Zr alloys, we have obtained Mössbauer spectra with well-defined magnetic texture and without line overlap by subtracting spectra measured with and without a small polarizing field. These spectra allow us to show that P(Bhf) has no bimodal structure at any temperature, and there is no paramagnetic component in the spectra above Txy. We therefore rule out the possibility that magnetically isolated clusters or precipitates play a role in the ordering. We also present high-field spectra which show homogeneous transverse-spin freezing at ∼28 K in a-Fe90Zr10.