In Gd microwires obtained by ultrafast cooling of the melt, a change in the magnetic entropy of 12 J/kg K was determined at a Curie temperature of 293 K in a magnetic field of 5 T. This value coincides with the change in the magnetic part of the entropy in bulk single-crystal samples in the same field. It has been found that in a strong magnetic field of 9 T, the temperature dependence of the entropy exhibits two maxima at temperatures of 292 and 312 K. The appearance of an additional entropy maximum in microstructured samples is caused by high mechanical microstresses retained in the sample after ultrafast cooling. Keywords: microwires, magnetic entropy, magnetoelastic anisotropy, Curie temperature.
Surface textures of austenite steel were produced by femtosecond laser. • One-dimensional nanograting and microrelief of various roughness have been received. • Ferrite (α-Fe) in the near-surface layers was formed in spallation regime. • Phases α-Fe, Fe 3 O 4 , γ-Fe 2 O 3 in the near-surface layers were formed in the phase explosion regimes. • Heat-affected zone was observed in the high-fluence mode for phase explosion regime.
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