Magnetic Flux Generation in YBCO Thin Film Loops by Optical Excitation Under Magnetic Field

摘要

We studied magnetic flux generation in a YBCO thin film loop by optical modulation of the shielding current induced by an external magnetic field with femtosecond (fs) laser pulses. The magnetic flux was successfully created in the loop and visualized by the terahertz radiation mapping. The radiation images revealed that the magnetic flux in the loop can be controlled by the fs laser pulses and its amount increases with increasing the laser power and external magnetic field.