Magnetoresistive sensor for weak magnetic fields
作者:
Timothy J. Moran,
E. Dan Dahlberg,
期刊:
Applied Physics Letters
(AIP Available online 1997)
卷期:
Volume 70,
issue 14
页码: 1894-1896
ISSN:0003-6951
年代: 1997
DOI:10.1063/1.118723
出版商: AIP
数据来源: AIP
摘要:
A new excitation technique is described for the measurement of weak magnetic fields (<0.01 Oe). The resistance variation of a magnetoresistive element due to an oscillating excitation field is converted into a voltage proportional to the environmental field. The excitation field amplitude is set large enough to saturate the magnetization during each half-cycle, greatly reducing hysteresis effects in the output signal. Both anisotropic magnetoresistance (AMR) and giant magnetoresistance (GMR) structures have been used to measure fields with sufficient accuracy for compass applications. Such devices could be made with extremely small dimensions and power requirements. ©1997 American Institute of Physics.
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