Magnetization process of ferromagnet–superconductor hybrid films

Abstract

Magnetic properties of ferromagnet–superconductor hybrid films were investigated below and above the superconducting critical temperature. Below the superconducting critical temperature, the hybrid films show not only large coercive force but also hysteresis shift. These changes depend on the magnetic state in the ferromagnetic layer at the superconducting critical temperature. Magnetization process of ferromagnet-superconductor hybrid films is discussed in terms of the critical state model for flux pinning in the superconducting layer.