论文信息 - High-T/sub c/ SQUID microscope for room temperature samples

High-T/sub c/ SQUID microscope for room temperature samples

A high-T/sub c/ SQUID microscope has been constructed for imaging samples at room temperature and atmospheric pressure. The SQUID is mounted on the upper end of a sapphire rod, cooled to liquid nitrogen temperature, below a 3-/spl mu/m thick silicon nitride vacuum window. This arrangement yields a SQUID-to-sample separation as low as 15 /spl mu/m. A sample can be placed on the window or scanned over the SQUID to produce magnetic images.

[1] N. G. Sepulveda,et al. Using a magnetometer to image a two‐dimensional current distribution , 1989 .

[2] M. Nisenoff,et al. NONDESTRUCTIVE EVALUATION OF METALLIC STRUCTURES USING A SQUID MAGNETOMETER , 1986 .

[3] J. J. Kingston,et al. Bicrystal YBCO DC SQUIDs with low noise , 1992, IEEE Transactions on Applied Superconductivity.

[4] Shaw,et al. Pairing symmetry and flux quantization in a tricrystal superconducting ring of YBa2Cu3O7- delta. , 1994, Physical review letters.

[5] A. D. Hibbs,et al. A high‐resolution magnetic imaging system based on a SQUID magnetometer , 1992 .

[6] John P. Wikswo,et al. MicroSQUID: A Close-Spaced Four Channel Magnetometer , 1989 .

[7] William J. Gallagher,et al. High‐resolution scanning SQUID microscope , 1995 .

[8] J.P. Wikswo,et al. SQUID magnetometers for biomagnetism and nondestructive testing: important questions and initial answers , 1995, IEEE Transactions on Applied Superconductivity.

[9] A. Cochran,et al. Electromagnetic nondestructive evaluation with simple HTS SQUIDs: measurements and modelling , 1995, IEEE Transactions on Applied Superconductivity.

[10] Amar,et al. Experimental proof of a time-reversal-invariant order parameter with a pi shift in YBa2Cu3O7- delta. , 1995, Physical review letters.