The phenomenon of stripe domain nucleation is deeply investigated both theoretically and experimentally in FePd films by the rigorous micromagnetic theory of domain nucleation and x-ray resonant magnetic scattering. The critical domain width and the nucleation field are determined by measuring the magnetic satellite peak position and integrated intensities in a wide temperature interval up to 400°C (0.9Tc) at varying in-plane magnetic fields for each temperature value. We develop and demonstrate a procedure that allows us to determine directly from the micromagnetic treatment the exchange stiffness constant A and the first order anisotropy constant Ku as a function of temperature. The proposed procedure, based on linearized micromagnetic equations at the critical field, is valid for magnetic films with perpendicular magnetic anisotropy, and is therefore effective to measure A and Ku in a technologically relevant class of materials.
Nucleation of weak stripe domains: Determination of exchange and anisotropy thermal variation / G. ASTI; M. GHIDINI; M. MULAZZI; R. PELLICELLI; SOLZI M.; K.CHESNEL; A. MARTY. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 76(2007), pp. 094414-1-094414-8. [10.1103/PhysRevB.76.094414]
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