Demonstration of Frequency-Domain Optical Data Storage of CuCl Semiconductor Nanocrystal Systems

Abstract

The harmonic generation effect in superconducting Bi(Pb)-Sr-Ca-Cu-O screen printed thick film is reported. When an ac field (H ac > 0.7 G) of frequency 10 kHz is applied to the film, odd harmonics corresponding to frequencies 30, 50 and 70 kHz are observed. The addition of a dc field H dc , induces the generation of even harmonics at frequencies 20, 40, 60, 80 kHz. The amplitudes of these harmonics are studied as a function of H ac and H dc . In the low-field region the amplitude of the even harmonics has been found to vary linearly with H dc with the maximum amplitude change found for the second harmonic. The development of a high-T c thick film magnetometer based on the measurement of the amplitude of the second harmonic is described. The sensitivity of this magnetometer has been found to depend on H ac and on the frequency of the ac field. The lowest field noise was found to be ≈1.5 × 10 −8 T.