Transverse spin freezing in a-Fe92Zr8 (invited)

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Abstract
High field magnetization measurements combined with Mössbauer spectroscopy with and without an external magnetic field have been used to study the evolution of magnetic order from wandering axis ferromagnet to asperomagnet at the transverse spin freezing transition (Txy=76±3 K) in amorphous Fe92Zr8. Below Txy, the total iron moment derived from the Mössbauer spectra is larger than its z component, determined by magnetization measurements. Mössbauer spectra measured with an external field of 3 T parallel to the γ beam show absorption due to the ΔmI=0 transitions only below Txy and confirm ordering of transverse spin components. Unlike the irreversibility in the dc susceptibility, the transition is not suppressed by the large measuring field, and therefore the fundamental nature of the transition is being probed rather than a sympton or side effect. The transition may be broadly interpreted in terms of a mean‐field mixed exchange model, although the detailed behavior is somewhat different. A phase diagram describing the effect of exchange frustration on magnetic ordering is presented, and the observed properties of the phases are outlined.

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