Magnetic sensors are the devices that the existence of magnetic field by measuring the absolute value or relative change of the magnitude and the direction of the magnetic field intensity. Nowadays magnetic field sensors are used widely in industry, military, medical treatment, space research, geology, etc [1]. The trend of magnetic sensor development is towards smaller, faster, cheaper, more sensitive and reliable. Among many magnetic sensors, our research group is conducting research to develop the gaint magneto-impedance (GMI) sensor [2,3] and the fluxgate sensor [4,5] for underground or underwater magnetic field communication applications. The proposed GMI sensor has the same structure as fundamental mode-orthogonal fluxgate (FM-OFG) sensor. We are currently conducting research to confirm to possibility of magnetic field communication between GMI sensor and FM-OFG sensor. In this work, we present an off-diagonal GMI sensor and its results for realizing high sensitivity magnetic sensor at receiver unit for magnetic field communication. The GMI sensor is fabricated the soft magnetic material composed Co-Fe-Si-B amorphous ferromagnetic wire of 100μm diameter and the length of 30mm. The solenoid-shaped pickup coil with 250 turns of cu wire with the diameter of 0.1mm was wound around the alumina insulation tube. The amorphous wire was inserted the alumina tube and then it was embedded in PCB substrate. The hysteresis curve experimental result of GMI sensor using the Helmholtz coil at 20MHz showed that the same characteristics as hysteresis curve of soft magnetic material with narrow coercivity of 0.046Oe. The maximum responsivity of GMI sensor was 8.53kV/T of linear range ±100μT with the experimental condition of 20MHz and the excitation AC voltage of 5.5V pp and DC bias of -2.0V dc . We confirmed the applicability of the GMI sensor for magnetic field communication through the experimental results. Detailed results of the proposed GMI sensor will be presented for a discussion.
KSP Keywords
AC voltage, Absolute value, Alumina tube, Amorphous wire, Co-Fe, Cu wire, Experimental Result, Fe-Si, Fundamental mode, GMI sensor, Helmholtz coil
Copyright Policy
ETRI KSP Copyright Policy
The materials provided on this website are subject to copyrights owned by ETRI and protected by the Copyright Act. Any reproduction, modification, or distribution, in whole or in part, requires the prior explicit approval of ETRI. However, under Article 24.2 of the Copyright Act, the materials may be freely used provided the user complies with the following terms:
The materials to be used must have attached a Korea Open Government License (KOGL) Type 4 symbol, which is similar to CC-BY-NC-ND (Creative Commons Attribution Non-Commercial No Derivatives License). Users are free to use the materials only for non-commercial purposes, provided that original works are properly cited and that no alterations, modifications, or changes to such works is made. This website may contain materials for which ETRI does not hold full copyright or for which ETRI shares copyright in conjunction with other third parties. Without explicit permission, any use of such materials without KOGL indication is strictly prohibited and will constitute an infringement of the copyright of ETRI or of the relevant copyright holders.
J. Kim et. al, "Trends in Lightweight Kernel for Many core Based High-Performance Computing", Electronics and Telecommunications Trends. Vol. 32, No. 4, 2017, KOGL Type 4: Source Indication + Commercial Use Prohibition + Change Prohibition
J. Sim et.al, “the Fourth Industrial Revolution and ICT – IDX Strategy for leading the Fourth Industrial Revolution”, ETRI Insight, 2017, KOGL Type 4: Source Indication + Commercial Use Prohibition + Change Prohibition
If you have any questions or concerns about these terms of use, or if you would like to request permission to use any material on this website, please feel free to contact us
KOGL Type 4:(Source Indication + Commercial Use Prohibition+Change Prohibition)
Contact ETRI, Research Information Service Section
Privacy Policy
ETRI KSP Privacy Policy
ETRI does not collect personal information from external users who access our Knowledge Sharing Platform (KSP). Unathorized automated collection of researcher information from our platform without ETRI's consent is strictly prohibited.
[Researcher Information Disclosure] ETRI publicly shares specific researcher information related to research outcomes, including the researcher's name, department, work email, and work phone number.
※ ETRI does not share employee photographs with external users without the explicit consent of the researcher. If a researcher provides consent, their photograph may be displayed on the KSP.