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Magnetostatic Spin Waves in Sputtered Ferromagnetic Films with Perpendicular Anisotropy: CoCr

Thermally excited spin waves in a sputtered magnetic slab with perpendicular anisotropy are discussed within a framework of the magnetostatic approximation. Light scattering from the spin waves is also discussed. The spin waves in sputtered CoCr films (12∼15 at.% of Cr and thicknesses up to ∼1 µm) are studied by means of Brillouin scattering in external magnetic fields up to 3.5 kOe. The magnetic constants of the initial ∼500 A-thick growth layer, which exhibits soft magnetic characteristics, are determined. As the perpendicular anisotropy which is dependent on the film thickness is increased, the peak width rapidly increases, making the observation of the spin wave scattering very difficult. The effectiveness of the Brillouin scattering technique for studying films with perpendicular anisotropy is discussed.