Unconventional ferromagnetic and spin-glass states of the reentrant spin glass Fe0.7Al0.3
Wei Bao, S. Raymond, S. M. Shapiro, K. Motoya, B. Fak, R. W. Erwin
Abstract
Spin excitations of single crystal Fe0.7Al0.3 were investigated over a wide range in energy and reciprocal space with inelastic neutron scattering. In the ferromagnetic phase, propagating spin wave modes become paramagnon-like diffusive modes beyond a critical wave vector q0, indicating substantial disorder in the long-range ordered state. In the spin glass phase, spin dynamics is strongly q-dependent, suggesting remnant short-range spin correlations. Quantitative model for S(energy,q) in the ``ferromagnetic'' phase is determined.
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