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The magnetic domain structure in a ferromagnetic (Ga,Mn)As epilayer with perpendicular magnetic easy-axis is investigated using high-resolution Kerr microscopy (KM). We show that, despite strong hysteresis, domain theory for thermodynamical equilibrium can be used to determine the ratio of the domain wall energy and the magnetic energy. Complementary magnetometry and ferromagnetic resonance (FMR)...
A new VCO concept dedicated to automotive radar applications is described in this paper. The fully integrated architecture used makes it low cost assembly oriented. Comfortable flexibility is proposed thanks to the integration of a dual-rank prescaler, three different tuning slope ports and a variable output power. Excellent performance is also provided thanks to the use of InGaP GaAs HBT, 12% of...
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