Multilayer MgB2 superconducting quantum interference filter magnetometers
Abstract
We report two types of all-MgB2 superconductive quantum interference filter (SQIF) magnetometers that can measure absolute magnetic fields with high sensitivity. In one configuration, the SQIFs were made of 20 multilayer nonplanar all-MgB2 superconducting quantum interference devices (SQUIDs) connected in parallel with loop areas ranging in size from 0.4 to 3.6 μm2. These devices are sensitive to magnetic fields parallel to the substrate and show a single antipeak from 3 to 16 K with a maximum transfer function of ∼16 V/T at 3 K and a field noise of ∼110 pT/Hz1/2 above 100 Hz at 10 K. In a second configuration, the SQIFs were made with 16 planar SQUIDs connected in parallel with loop areas ranging in size from 4 μm2 to 25 μm2 and are sensitive to the magnetic fields perpendicular to the substrate. The planar SQIF shows a single antipeak from 10 to 22 K with a maximum transfer function of 7800 V/T at 10 K and a field noise of ∼70 pT/Hz1/2 above 100 Hz at 20 K.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 25, 2016
- Source ID
- 10.1063/1.4947592
Entities
People
- Bruce A. Davidson
- Elias Galan
- Ke Chen
- Thomas Melbourne
- X. X. Xi
Organizations
- National Science Foundation
- Office of Naval Research
- Temple University