Magnetometer Design for Measuring Ultralow DC Magnetic Fields Using YBa2Cu3O7-x Superconductors


Alikma F., Topal U.

JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, vol.26, no.4, pp.1155-1158, 2013 (Journal Indexed in SCI) identifier

  • Publication Type: Article / Article
  • Volume: 26 Issue: 4
  • Publication Date: 2013
  • Doi Number: 10.1007/s10948-012-1901-x
  • Title of Journal : JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
  • Page Numbers: pp.1155-1158

Abstract

In the present work we examined a special sensor design using a YBa2Cu3O7-x superconductor as a sensing element for the detection of ultralow DC magnetic fields. The experimental results have shown that the sensor signal, which is the second harmonic signal generated by co-application of AC and DC fields to high-T (c) superconductors, varies linearly with the applied DC field even in the -0.5 Oe to 0.5 Oe range. The critical factors affecting the strength of the second harmonic signal, such as the frequency and amplitude of the AC field, the intergrain critical field H (c1J) , and the minimum field required for penetration through the entire specimen H (au), were optimized. In this way we could detect DC magnetic fields as low as 1 nT.