Magnetometer is one of the indispensable instruments utilized for the magnetic property characterization of materials, where it evaluates the magnetic response originated from the materials. The non-invasive magnetic technique has promoted magnetometer to be utilized in new applications such as in biomedical applications. In this work, we report the development of a magnetometer utilizing a high critical temperature superconducting quantum interference device (high-T_c SQUID) and a flux transformer composed of an induction coil. The high-T_c SQUID is used in order to realize high sensitivity, compact, and low-running cost magnetometer for biomedical applications such as characterization of magnetic nanoparticles. A first-order planar gradiometer with a compensation coil was used as the detection coil to achieve high sensitivity and cancellation factor. We fabricate an electromagnet with primary and small secondary excitation coils to enable a wide range of the excitation magnetic field with a high resolution. To reduce the magnetic field’s drift, we apply a digital feedback program to control the electrical current of the electromagnet. The performance of the developed system is demonstrated by measuring the magnetization curve and AC responses of an iron oxide composite sample. The sensitivity showed by the developed magnetometer reveals its potential for a highly sensitive magnetic property characterization.

磁强计是用于表征材料磁性能的必不可少的仪器之一，它可以评估源自材料的磁响应。非侵入式磁性技术促进了磁力计在新的应用中使用，例如在生物医学应用中。在这项工作中，我们报告了利用高临界温度超导量子干扰设备（high- T _c SQUID）和由感应线圈组成的磁通变压器开发的磁力计的发展。高T _c使用SQUID是为了实现高灵敏度，紧凑且运行成本低的磁力计，用于生物医学应用，例如磁性纳米粒子的表征。具有补偿线圈的一阶平面梯度仪被用作检测线圈，以实现高灵敏度和抵消因子。我们制造了带有初级和小型次级励磁线圈的电磁体，以实现高分辨率的宽范围励磁磁场。为了减少磁场的漂移，我们应用了数字反馈程序来控制电磁体的电流。通过测量氧化铁复合样品的磁化曲线和交流响应，可以证明所开发系统的性能。