Magnetostriction of the Fe73.5Cu1Ta2Nb1Si13.5B9 alloy

Abstract The investigated Finemet type system with partial substitution of Nb by Ta has been prepared by rapid quenching and subsequently heat treated in vacuum for the measurement of λ∥ and λ⊥. The calculated values of magnetostriction λS and ∂ω⧸∂H indicate strong influence of thermal treatment and transformation processes. After modest changes of λS upon relaxation, a large change is observed upon nanocrystalline phase formation. The values of ω follow the magnetic anisotropy in the sample and ∂ω⧸∂H reflects the internal stresses accompanying transformation processes.