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磁传感器在诸多领域有着广泛的应用,而随着高温超导技术的快速发展,将高温超导材料应用于磁信号测量成为超导材料应用的一个重要领域。文章探讨了高温超导材料在微弱磁场测量方面的主要应用,介绍了三种在微弱磁场测量方面能达到或有希望达到f T量级的传感器。其中包括:基于约瑟夫森结效应的超导量子干涉器(SQUID),基于超导零电阻效应的巨磁电阻(GMR)磁传感器和由文章作者所在的实验室提出的巨磁阻抗(GMI)/超导复合磁传感器。文章重点介绍了GMI/超导复合磁传感器,并对此传感器在结构和应用方面的最新进展进行了说明。
Magnetic sensors have been widely used in many fields. With the rapid development of high temperature superconducting technology, the application of high temperature superconducting materials in magnetic signal measurement becomes an important field of application of superconducting materials. In this paper, the main applications of high temperature superconducting materials in the measurement of weak magnetic field are discussed. Three kinds of sensors that can reach or hopefully reach f T in weak magnetic field measurement are introduced. These include the SQUID based on the Josephson junction effect, the giant magnetoresistive (GMR) magnetic sensor based on the superconducting zero resistance effect and the GMI / GMR sensor proposed by the author’s laboratory. Superconducting composite magnetic sensor. The article focuses on the GMI / superconducting composite magnetic sensor, and the sensor in the structure and application of the latest developments are described.