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首页> 外文期刊>Journal of magnetism and magnetic materials >Current annealing of amorphous wire core for performance improvement of fundamental mode orthogonal fluxgate
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Current annealing of amorphous wire core for performance improvement of fundamental mode orthogonal fluxgate

机译：非晶丝芯的电流退火以改善基模正交磁通门的性能

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摘要

Magnetic sensors adopting amorphous wires have advantages in high sensitivities and low noise characteristics, yet those performances would be irreproducible due to the inhomogeneity existing in amorphous wires. In this research, glass-coated Co-Fe-Si-B-Cr amorphous magnetic wire was adopted to a fundamental mode orthogonal fluxgate (FM-OFG) sensor to investigate its adaptability as a magnetic core. In as-cast wire form, non-repeatability and anomaly found in the magnetization process deteriorated the sensor noise performance. Current annealing was then performed to the wire core. It was confirmed that the current annealing greatly improved the repeatability in magnetization, reducing the sensor noise level to 30 % of the case obtained with the as-cast wire core. Further analyses on current annealing parameters implied that the internal stress relaxation of the wire was rapidly occurring at the beginning of the annealing, followed by the induction of circumferential anisotropy. The results revealed that those changes in magnetic property were repeatable and controllable, making the sensitivity and noise performance of the sensors highly reproducible. This feature will be a great advantage in further practical development of the sensors.
机译：采用非晶态导线的磁传感器在高灵敏度和低噪声特性方面具有优势，但是由于非晶态导线中存在的不均匀性，这些性能将无法再现。在这项研究中，将玻璃涂层的Co-Fe-Si-B-Cr非晶电磁线用于基本模式正交磁通门（FM-OFG）传感器，以研究其作为磁芯的适应性。以铸线形式，在磁化过程中发现的不可重复性和异常会降低传感器的噪声性能。然后对线芯进行电流退火。可以肯定的是，当前的退火处理大大改善了磁化的可重复性，将传感器噪声水平降低到铸态线芯的30％。对当前退火参数的进一步分析表明，线材的内部应力松弛在退火开始时迅速发生，随后引起周向各向异性。结果表明，那些磁性的变化是可重复的和可控的，从而使传感器的灵敏度和噪声性能具有很高的再现性。该特征将在传感器的进一步实际开发中具有很大的优势。

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