Magnetization process of ferromagnet-superconductor hybrid films

Magnetic properties of ferromagnet-superconductor hybrid films were investi gated below and above the superconducting critical temperature. Below the s uperconducting critical temperature, the hybrid films show not only large c oercive force but also hysteresis shift. These changes depend on the magnet ic state in the ferromagnetic layer at the superconducting critical tempera ture. Magnetization process of ferromagnet-superconductor hybrid films is d iscussed in terms of the critical state model for flux pinning in the super conducting layer. (C) 2001 Elsevier Science B.V. All rights reserved.