SUSCEPTIBILIDAD MAGNÉTICA AC EN FUNCIÓN DE LA FRECUENCIA EN TRICAPAS DE YBa2Cu3O7-δ/La1/3Ca2/3MnO3/La2/3 Ca1/3MnO3.

Field frequency dependence with the ac magnetic susceptibility in S/AF/F trilayers was studied. Trilayers were deposited in situ onto (001) SrTiO3 substrates using the dc sputtering technique. ac susceptibility measurements, Χ'+ Χ'', were performed under an alternative field amplitude of hac=0.1 Oe applied along to (001)-direction, and frequencies from 1.1 kHz and 51.1 kHz. Trilayers displayed a diamagnetic behavior below TC~ 76 K, susceptibility data shown that superconducting transition wide ΔTC and the superconducting volume fraction fg with the frequency increasing are no affected. Applying the Jönnson model to ... effective pinning energy was obtained in the flux creep and flux flow regimens. [ABSTRACT FROM AUTHOR]