2004/02/29 by M. G. Pini, P. Politi, Paolo Politi +5
Materials Science · Physics and Astronomy · #Magnetic and transport properties of perovskites and related materials #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.70.094422
published as Phys. Rev. B 70, 094422 (2004) · Shortened version (7 pages). Accepted for publication in Physical Review B
arxiv created 2004/07/22 · openalex publication_date 2004/09/28 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
A double-peaked structure was observed in the in situ Brillouin Light Scattering (BLS) spectra of a 6\phantom\rule0.3em0ex\mathrm\AA thick epitaxial Fe∕GaAs(001) film for values of an external magnetic field H, applied along the hard in plane direction, lower than a critical value Hc\ensuremath≃0.9\phantom\rule0.3em0exkOe. This experimental finding is theoretically interpreted in terms of a model which assumes a nonhomogeneous magnetic ground state characterized by the presence of perperpendicular up/down stripe domains. For such a ground state, two spin-wave modes, namely an acoustic and an optic mode, can exist. Upon increasing the field the magnetization tilts in the film plane, and for H\ensuremath\geqslantHc the ground state is homogeneous, thus allowing the existence of just a single spin-wave mode. The frequencies of the two spin-wave modes were calculated and successfully compared with the experimental data. The field dependence of the intensities of the corresponding two peaks that are present in the BLS spectra was also estimated, providing further support to the above-mentioned interpretation.