Open Physics · 2007 · 10 citations · 14 references
Natural SciencesMaterials EngineeringMaterials ScienceElectronic MaterialsMicrowave EngineeringThin FilmsElectrical ConductivityFerromagnetic MaterialsMagnetic Properties Of SolidsSuperconducting MaterialsSuperconducting Thin FilmsThin Film Electrical PropertiesCharacterization Of Microwave MaterialsCharge Carrier DensityHigh-temperature SuperconductorsMagnetron SputteringSputteringSurface ImpedanceSurface ResistanceSurface Resistance Estimation
Abstract Superconductor/ferromagnetic (SC/FM) Y1Ba2Cu3O7−δ /La0.7Sr0.3MnO3 (YBCO/LSMO) double layers were prepared on LaAlO3 substrates by magnetron sputtering and their electrical and microwave parameters were investigated at 77 K. In the theoretical plan, simple formulas for estimation of the sensitivity of the SC surface impedance to the concentration changes of normal charge carriers were proposed and the surface resistance R S peculiarities of both SC and FM surfaces were described. Thinner YBCO/LSMO structure was characterized by lower SC parameters and higher surface resistance R S at ∼ 4 GHz. The difference of R S of sample SC surfaces was interpreted as due to a difference between the normal charge carrier densities in these samples. R S of the FM surface was higher than that of the SC surface due to the microwave losses of the magnetic subsystem. A peak of the microwave losses, observed in the thicker double layer, was assumed to be caused by uniform FMR in the LSMO film.
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Ferromagnetic resonance of ultrathin metallic layers
Michael Farle · Reports on Progress in Physics · 1998 · 902 citations