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Non-crystalline Co films have been deposited on the cylindrical surface of copper wires by pulsed laser ablation deposition. These films are magnetoelastic. In particular, they exhibit the inverse Wiedemann effect (IWE): when they are twisted and an electrical current flows through the wires, a longitudinal component of the magnetization is observed. The value of the spontaneous magnetization, M s , of these films is achieved by the measurement of this effect. The dependence of the IWE on the torsion as well as on the circular magnetic field has been measured. The magnetostriction constant, λ s , has been found to be negative and λ s ≈−(9.5±0.8)×10 −6 .