Longitudinal and transverse magnetizations in micron-thick Y-Ba-Cu-O films in nearly parallel magnetic fields

We have studied the magnetization in c-axis oriented-micron-thick Y-Ba-Cu-O (YBCO) films in magnetic fields oriented nearly parallel to the ab plane. The orientation dependence of the magnetic moment is dominated by shape anisotropy effects and this moment is contributed by its component along the c-axis for most of the cases. However, when the applied field is oriented very close to the ab plane, it is found to have a hysteretic component contributed by in-plane magnetization due to flux penetration along the ab plane. We measured longitudinal (along the field), and transverse (orthogonal to the field) moments to elicit in-plane magnetic response. At high fields, the penetrating flux in the ab plane decreases the critical current density in the ab plane, which results in the reduction of c-axis magnetic moment.