Angular Dependence of Magnetic Relaxation and Remanent Magnetization on YBCO/PBCO Superlattice and YBCO Thin Film

We measured the angular dependence of magnetic relaxation and remanent magnetization at various temperatures on a YBCO/PBCO superlattice and a YBCO thin film to investigate the fluctuation of the anisotropy of flux pinning. The measuring temperatures were from 20 K to Tc,onset and the applied magnetic field was 1000 Oe. The angles between the applied magnetic field and the c-axis of superlattices were 0°, 30°, 45°, 60°,.... In the measurement of the angular dependence of remanent magnetization, the angles between the magnetometer and c-axis were from -90 to 90°. The Anderson-Kim model was introduced to derive the pinning potential. It wa5 observed that only the component of applied magnetic field along c-axis of the samples contributed to flux pinning and we also obtained the relation, M8 = Ml1 cos ө, where Ml1 is the magnetization along the c-axis. The causes are discussed.

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Angular Dependence of Magnetic Relaxation and Remanent Magnetization on YBCO/PBCO Superlattice and YBCO Thin Film

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