M. Tonouchi, Magnetic flux quanta in YBa2Cu3O7-delta thin-film loops controlled by femtosecond optical pulses, JPN J A P 2, 40(6A), 2001, pp. L542-L544
The optical control of magnetic flux in superconducting thin-film loops is
studied by terahertz radiation imaging. The magnetic flux quanta phi are ge
nerated in the loop by illuminating it with femtosecond optical pulses unde
r the bias current I-B. The optically generated phi are semiqualitatively e
valuated by estimating the amount of the persistent supercurrent circulatin
g along the loop. The threshold and hysteretic characteristics are found in
the phi -I-B curves, which strongly depend on optical excitation condition
s such as laser power and bias current.