Abstract
Experimental evidence is presented and reviewed that amorphous Fe91Zr9 does not exhibit conventional long-range ordered ferromagnetism below its Tc=210 K, but rather enters a state characteristic of a strongly exchange-frustrated system in which the ferromagnetic correlations are quite short range (less than 30 Å) as determined by small-angle neutron scattering (SANS). At a lower temperature the SANS develops a Lorentzian-squared component to the line shape which is evidence of cluster spin freezing. Inelastic scattering data show no resolvable spin-wave peaks and place an upper limit of 12–15 meV Å2 on the spin stiffness D. The anomalously small ratio of D/Tc is further evidence of a system near a multicritical point concentration.
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