Abstract
Heusler alloy films Co2MnGa grown on ScErAs∕GaAs(001) substrates form stripe domains in the remnant state due to its large strain-induced out-of-plane anisotropy. The dynamics of the stripe domains has been investigated using a microstrip ferromagnetic resonance device in a broad frequency range (∼3–25GHz). In both in-plane and out-of-plane measurement geometries, three modes were observed in fields less than the saturation field. The resulting frequency/field dispersion curve reveals that one mode has characteristics of an acoustic mode, the other of an optic mode, and with the third being nearly field independent. The acoustic mode continues into the saturated state, while the optic mode does not appear above saturation. The experimental data are analyzed using Wigen’s stripe domain theory.
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