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- W2032224139 abstract "Neutron inelastic scattering experiments have been performed in order to study the long wavelength spin dynamics of the amorphous Invar system Fe90−xNixZr10 (for x=5,10). Spin waves were observed over the entire range of wave vectors (0.05–0.15 Å−1) and temperatures (0.3–0.9 TC) under study. The spin-wave energies are well described by the quadratic dispersion relation Eq=Dq2+Δ, where Δ is a small gap due primarily to dipolar interactions. The stiffness parameter D renormalizes with temperature as D(T)=D(0) ×[1−A(T/TC)5/2] throughout the temperature range under study. The values of D(0) corresponding to x=5, 10, are 42.1 and 78.0 meV Å2, respectively, with A=0.83. In the temperature range 0.55–0.90 TC the intrinsic spin-wave linewidths Γq can be fitted equally well to the q4 dependence predicted by hydrodynamic spin-wave theory, or to the q5 dependence predicted from the topological disorder in amorphous systems, but they did not show the T2 behavior expected from magnon interactions. These findings suggest that there might be relevant spin-wave broadening mechanisms, perhaps due to the magnetic disorder in the system, in addition to magnon-magnon interactions." @default.
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- W2032224139 date "1987-04-15" @default.
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- W2032224139 title "Spin dynamics of amorphous Fe90−<i>x</i>Ni<i>x</i>Zr10" @default.
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- W2032224139 doi "https://doi.org/10.1063/1.338938" @default.
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