| Autor: |
Hibbs, A. D., Sager, R. E., Kumar, S., McArthur, J. E., Singsaas, A. L., Jensen, K. G., Steindorf, M. A., Aukerman, T. A., Schneider, H. M. |
| Předmět: |
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| Zdroj: |
Review of Scientific Instruments; Aug1994, Vol. 65 Issue 8, p2644, 9p |
| Abstrakt: |
We have developed a high-resolution ac susceptometer that uses a rf superconducting quantum interference device to directly measure the flux coupled into a superconducting detection coil from a sample's changing magnetic moment in an applied ac field. The system operates in a frequency range from 0.01 to 1500 Hz and an applied ac field range of 0.1-400 µT with a sensitivity of about 5 × 10[sup -12] A m² for magnetic moment measurement, and at a reduced sensitivity down to 0.001 Hz. The instrument is based on an existing dc magnetometer system and uses that system's temperature control and dc superconducting magnet to allow operation over a temperature range from 2 to 400 K and in applied dc fields of ± 5.0 T. During a measurement all operations are controlled automatically by computer from a menu-driven software system, with user input required only on initiation of a measurement sequence. Both real and imaginary components of the ac susceptibility can be determined. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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