Detection of Sub-pT Field of Magnetic Responses in Metals and Magnetic Materials by Highly Sensitive Magnetoresistive Sensors
We developed a measurement system capable of detecting magnetic responses in various material samples. The system utilizes an excitation coil to apply an alternating magnetic field within the frequency range of 1–10 kHz. The magnetic field generated in the samples was detected using a highly sensiti...
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| Format: | Article |
| Language: | English |
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MDPI AG
2025-01-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/25/3/776 |
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| author | Hyuna Ahn Ayana Tanaka Yuta Kono Suko Bagus Trisnanto Tamon Kasajima Tomohiko Shibuya Yasushi Takemura |
| author_facet | Hyuna Ahn Ayana Tanaka Yuta Kono Suko Bagus Trisnanto Tamon Kasajima Tomohiko Shibuya Yasushi Takemura |
| author_sort | Hyuna Ahn |
| collection | DOAJ |
| description | We developed a measurement system capable of detecting magnetic responses in various material samples. The system utilizes an excitation coil to apply an alternating magnetic field within the frequency range of 1–10 kHz. The magnetic field generated in the samples was detected using a highly sensitive magnetoresistive sensor. The system demonstrated a detection lower limit in the sub-pT range for magnetic fields arising from magnetic responses such as eddy currents and magnetization changes. The frequency dependence of the detected signal intensities correlated well with the physical mechanisms underlying the magnetic responses. Notably, the distance between the excitation coil and the magnetic sensor was maintained at 300 mm. These results, which demonstrate the detection of a sub-pT magnetic field using a highly sensitive magnetic sensor, have not been previously reported and provide valuable insights for advancing practical applications in non-destructive testing and clinical diagnostic imaging. |
| format | Article |
| id | doaj-art-69486dfd7138447284c7ecea34a1901c |
| institution | OA Journals |
| issn | 1424-8220 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj-art-69486dfd7138447284c7ecea34a1901c2025-08-20T02:12:33ZengMDPI AGSensors1424-82202025-01-0125377610.3390/s25030776Detection of Sub-pT Field of Magnetic Responses in Metals and Magnetic Materials by Highly Sensitive Magnetoresistive SensorsHyuna Ahn0Ayana Tanaka1Yuta Kono2Suko Bagus Trisnanto3Tamon Kasajima4Tomohiko Shibuya5Yasushi Takemura6Department of Electrical and Computer Engineering, Yokohama National University, Yokohama 240-8501, JapanDepartment of Electrical and Computer Engineering, Yokohama National University, Yokohama 240-8501, JapanDepartment of Electrical and Computer Engineering, Yokohama National University, Yokohama 240-8501, JapanDepartment of Electrical and Computer Engineering, Yokohama National University, Yokohama 240-8501, JapanAdvanced Products Development Center, Technology and Intellectual Property HQ, TDK Corporation, Tokyo 103-6128, JapanAdvanced Products Development Center, Technology and Intellectual Property HQ, TDK Corporation, Tokyo 103-6128, JapanDepartment of Electrical and Computer Engineering, Yokohama National University, Yokohama 240-8501, JapanWe developed a measurement system capable of detecting magnetic responses in various material samples. The system utilizes an excitation coil to apply an alternating magnetic field within the frequency range of 1–10 kHz. The magnetic field generated in the samples was detected using a highly sensitive magnetoresistive sensor. The system demonstrated a detection lower limit in the sub-pT range for magnetic fields arising from magnetic responses such as eddy currents and magnetization changes. The frequency dependence of the detected signal intensities correlated well with the physical mechanisms underlying the magnetic responses. Notably, the distance between the excitation coil and the magnetic sensor was maintained at 300 mm. These results, which demonstrate the detection of a sub-pT magnetic field using a highly sensitive magnetic sensor, have not been previously reported and provide valuable insights for advancing practical applications in non-destructive testing and clinical diagnostic imaging.https://www.mdpi.com/1424-8220/25/3/776non-destructive testingmagnetic particle imagingmagnetoresistive sensoreddy currentmagnetic nanoparticlesAC magnetic susceptibility |
| spellingShingle | Hyuna Ahn Ayana Tanaka Yuta Kono Suko Bagus Trisnanto Tamon Kasajima Tomohiko Shibuya Yasushi Takemura Detection of Sub-pT Field of Magnetic Responses in Metals and Magnetic Materials by Highly Sensitive Magnetoresistive Sensors Sensors non-destructive testing magnetic particle imaging magnetoresistive sensor eddy current magnetic nanoparticles AC magnetic susceptibility |
| title | Detection of Sub-pT Field of Magnetic Responses in Metals and Magnetic Materials by Highly Sensitive Magnetoresistive Sensors |
| title_full | Detection of Sub-pT Field of Magnetic Responses in Metals and Magnetic Materials by Highly Sensitive Magnetoresistive Sensors |
| title_fullStr | Detection of Sub-pT Field of Magnetic Responses in Metals and Magnetic Materials by Highly Sensitive Magnetoresistive Sensors |
| title_full_unstemmed | Detection of Sub-pT Field of Magnetic Responses in Metals and Magnetic Materials by Highly Sensitive Magnetoresistive Sensors |
| title_short | Detection of Sub-pT Field of Magnetic Responses in Metals and Magnetic Materials by Highly Sensitive Magnetoresistive Sensors |
| title_sort | detection of sub pt field of magnetic responses in metals and magnetic materials by highly sensitive magnetoresistive sensors |
| topic | non-destructive testing magnetic particle imaging magnetoresistive sensor eddy current magnetic nanoparticles AC magnetic susceptibility |
| url | https://www.mdpi.com/1424-8220/25/3/776 |
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