Magnetic surface anomaly in high purity YIG

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Abstract
LPE YIG films have been shown to exhibit variable magnetization and uniaxial anisotropy in the regions nearest the air/YIG and YIG/GGG interfaces. The change in magnetic properties has been modeled in terms of ΔHs=[(Hu−4πM)surf−(Hu−4πM)bulk] due to the difficulty in separating the uniaxial anisotropy and the magnetization within a region. FMR measurements of ΔHs indicate that homogeneous surface conditions can be restored by implantation of 1×1016 Ar/cm2 at energies of 60 or 123 keV and annealing for at least 2 h in an oxygen atmosphere at 915 °C. It is thought that the implantation destroys the crystalline order of the surface and facilitates regrowth of the prototype YIG structure from the high‐purity YIG beyond the first few hundred angstroms.

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