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Full-Text Articles in Electromagnetics and Photonics
Measurement Of Kappa In High Tc Superconductors, R. Karim, H. How, C. Vittoria, A. Widom
Measurement Of Kappa In High Tc Superconductors, R. Karim, H. How, C. Vittoria, A. Widom
Carmine Vittoria
The experimental magnetic-field derivative of the microwave absorption signal, obtained using electron paramagnetic resonance techniques, has a line shape that depends on the Ginzburg-Landau model parameter κ of the superconducting sample at a given temperature. The type-II superconducting equation of state can be utilized to describe the drop in the output microwave power derivative, from its maximum at H ≃Hc1 to its much lower values when H ≫Hc1, in order to estimate the values of κ. The technique also allows for the experimental determination of hysteretic behavior in B as a function of H.
Zero Magnetic-Field Ferromagnetic-Resonance Properties Of Single-Crystal Yig/Ggg/Yig Layers, K. Sun, P. Dorsey, C. Vittoria
Zero Magnetic-Field Ferromagnetic-Resonance Properties Of Single-Crystal Yig/Ggg/Yig Layers, K. Sun, P. Dorsey, C. Vittoria
Carmine Vittoria
This study is an extension of previous work dealing with single crystals of YIG/GGG/YIG grown in (110) layers. Ferromagnetic resonance (FMR) measurements for fields along the axis were performed. The microwave measurements reveal hysteretic behavior as the FMR frequency is measured for positive and negative magnetic fields H. For H in which the magnetic moment is zero (spin flop) the FMR frequency goes through a discrete and measurable jump or change. This discontinuity in the FMR frequency at the spin-flop condition is attributed to the magnetostatic interaction between the two YIG layers.