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Thermal variation in magnetic properties of laser annealed Ga-substituted EuYIG films

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2 Author(s)
Herma, D. ; U.S. Military Academy, West Point, New York, USA ; DeLuca, J.

Laser annealing makes available substituted bubble garnet films with identical composition but widely differing cation distributions. To investigate the thermal dependence of the magnetic properties of these films, we developed a high temperature bubble statics technique (293 to 440K), and employed variable temperature SQUID magnetometry (4.3 to 400K) and ferromagnetic resonance (∼7.5 to 293K). We have studied the variation of saturation magnetization (4πMs) and the uniaxial anisotropy constant (Ku) in laser-annealed, substituted EuYIG films from approximately 50K to each sample's Curie temperature (Tc). In films (with identical composition) whose room temperature magnetizations vary by nearly 2:1, we find thermal dependencies for 4πMsthat support the simple cation exchange model for laser annealing. The temperature dependence of Kuis remarkably linear from 100K (below saturation of 4πMs) to about 50° below Tcin each sample, indicating a significant magnetostrictive contribution. Temperature stabilities of 4πMsand Q are also discussed.

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Magnetics, IEEE Transactions on  (Volume:19 ,  Issue: 5 )