Design and implementation of a micro-coil induction magnetometer

TL;DR

This paper introduces a micron-scale induction magnetometer fabricated via MEMS technology, capable of detecting superconducting transitions in mesoscopic samples with high sensitivity.

Contribution

The paper presents a novel micro-coil induction magnetometer design and demonstrates its effectiveness in measuring the magnetic response of high-Tc superconducting samples.

Findings

Successfully detected the Meissner transition in a Bi2Sr2CaCu2O8 disk

Designed a sensitive device using MEMS fabrication techniques

Achieved measurement of superconducting properties at micron scale

Abstract

We present a micron-sized induction magnetometer designed to measure the magnetic response of superconducting mesoscopic samples. The device is manufactured using the Memscap PolyMUMPs process and consists of two octagonal planar parallel micro-coils covering an area of 240 microns X 240 microns, which are separated by only 2.75 microns. We show that this design is sufficiently sensitive to detect the Meissner transition at zero dc field, of a high-Tc superconductor Bi2Sr2CaCu2O8 disk of 40 microns in diameter and 1 micron in thicknesses.