Observation of low frequency spin dynamics in INVAR Fe$_{65}$Ni$_{35}$

We present ferromagnetic neutron spin echo measurements and muon spin relaxation ($μ$SR) measurements of the spin dynamics in the ordered phase of the metallic alloy INVAR Fe$_{65}$Ni$_{35}$. Both techniques display evidence of slow spin dynamics in the ordered phase which could be associated with the INVAR effect. Zero field (ZF) and longitudinal field $μ$SR measurements suggest the presence of two separate timescales of slow spin-dynamics in the ordered phase; a fast component corresponding to that observed in our neutron-spin-echo measurements and a second slow component which may be related to the "cluster" spin-fluctuations or to the dynamics of disordered local moments or both as suggested by previous neutron scattering measurements and recent theoretical studies.

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