The Effect of Geometrical Overlap between Giant Magnetoresistance Sensor and Magnetic Flux Concentrators: A Novel Comb-Shaped Sensor for Improved Sensitivity
The combination of magnetoresistive (MR) element and magnetic flux concentrators (MFCs) offers highly sensitive magnetic field sensors. To maximize the effect of MFC, the geometrical design between the MR element and MFCs is critical. In this paper, we present simulation and experimental studies on...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-12-01
|
| Series: | Sensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1424-8220/22/23/9385 |
| _version_ | 1827642460154626048 |
|---|---|
| author | Prabhanjan D. Kulkarni Hitoshi Iwasaki Tomoya Nakatani |
| author_facet | Prabhanjan D. Kulkarni Hitoshi Iwasaki Tomoya Nakatani |
| author_sort | Prabhanjan D. Kulkarni |
| collection | DOAJ |
| description | The combination of magnetoresistive (MR) element and magnetic flux concentrators (MFCs) offers highly sensitive magnetic field sensors. To maximize the effect of MFC, the geometrical design between the MR element and MFCs is critical. In this paper, we present simulation and experimental studies on the effect of the geometrical relationship between current-in-plane giant magnetoresistive (GMR) element and MFCs made of a NiFeCuMo film. Finite element method (FEM) simulations showed that although an overlap between the MFCs and GMR element enhances their magneto-static coupling, it can lead to a loss of magnetoresistance ratio due to a magnetic shielding effect by the MFCs. Therefore, we propose a comb-shaped GMR element with alternate notches and fins. The FEM simulations showed that the fins of the comb-shaped GMR element provide a strong magneto-static coupling with the MFCs, whereas the electric current is confined within the main body of the comb-shaped GMR element, resulting in improved sensitivity. We experimentally demonstrated a higher sensitivity of the comb-shaped GMR sensor (36.5 %/mT) than that of a conventional rectangular GMR sensor (28 %/mT). |
| first_indexed | 2024-03-09T17:31:39Z |
| format | Article |
| id | doaj.art-1d5be4fee2974473879c701e9051a410 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-09T17:31:39Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-1d5be4fee2974473879c701e9051a4102023-11-24T12:13:16ZengMDPI AGSensors1424-82202022-12-012223938510.3390/s22239385The Effect of Geometrical Overlap between Giant Magnetoresistance Sensor and Magnetic Flux Concentrators: A Novel Comb-Shaped Sensor for Improved SensitivityPrabhanjan D. Kulkarni0Hitoshi Iwasaki1Tomoya Nakatani2Research Center for Magnetic and Spintronic Materials, National Institute for Materials Science, 1-2-1, Sengen, Tsukuba 305-0047, JapanResearch Center for Magnetic and Spintronic Materials, National Institute for Materials Science, 1-2-1, Sengen, Tsukuba 305-0047, JapanResearch Center for Magnetic and Spintronic Materials, National Institute for Materials Science, 1-2-1, Sengen, Tsukuba 305-0047, JapanThe combination of magnetoresistive (MR) element and magnetic flux concentrators (MFCs) offers highly sensitive magnetic field sensors. To maximize the effect of MFC, the geometrical design between the MR element and MFCs is critical. In this paper, we present simulation and experimental studies on the effect of the geometrical relationship between current-in-plane giant magnetoresistive (GMR) element and MFCs made of a NiFeCuMo film. Finite element method (FEM) simulations showed that although an overlap between the MFCs and GMR element enhances their magneto-static coupling, it can lead to a loss of magnetoresistance ratio due to a magnetic shielding effect by the MFCs. Therefore, we propose a comb-shaped GMR element with alternate notches and fins. The FEM simulations showed that the fins of the comb-shaped GMR element provide a strong magneto-static coupling with the MFCs, whereas the electric current is confined within the main body of the comb-shaped GMR element, resulting in improved sensitivity. We experimentally demonstrated a higher sensitivity of the comb-shaped GMR sensor (36.5 %/mT) than that of a conventional rectangular GMR sensor (28 %/mT).https://www.mdpi.com/1424-8220/22/23/9385magnetoresistive sensorsgiant magnetoresistancemagnetic flux concentratormagnetic circuitfinite element method simulation |
| spellingShingle | Prabhanjan D. Kulkarni Hitoshi Iwasaki Tomoya Nakatani The Effect of Geometrical Overlap between Giant Magnetoresistance Sensor and Magnetic Flux Concentrators: A Novel Comb-Shaped Sensor for Improved Sensitivity Sensors magnetoresistive sensors giant magnetoresistance magnetic flux concentrator magnetic circuit finite element method simulation |
| title | The Effect of Geometrical Overlap between Giant Magnetoresistance Sensor and Magnetic Flux Concentrators: A Novel Comb-Shaped Sensor for Improved Sensitivity |
| title_full | The Effect of Geometrical Overlap between Giant Magnetoresistance Sensor and Magnetic Flux Concentrators: A Novel Comb-Shaped Sensor for Improved Sensitivity |
| title_fullStr | The Effect of Geometrical Overlap between Giant Magnetoresistance Sensor and Magnetic Flux Concentrators: A Novel Comb-Shaped Sensor for Improved Sensitivity |
| title_full_unstemmed | The Effect of Geometrical Overlap between Giant Magnetoresistance Sensor and Magnetic Flux Concentrators: A Novel Comb-Shaped Sensor for Improved Sensitivity |
| title_short | The Effect of Geometrical Overlap between Giant Magnetoresistance Sensor and Magnetic Flux Concentrators: A Novel Comb-Shaped Sensor for Improved Sensitivity |
| title_sort | effect of geometrical overlap between giant magnetoresistance sensor and magnetic flux concentrators a novel comb shaped sensor for improved sensitivity |
| topic | magnetoresistive sensors giant magnetoresistance magnetic flux concentrator magnetic circuit finite element method simulation |
| url | https://www.mdpi.com/1424-8220/22/23/9385 |
| work_keys_str_mv | AT prabhanjandkulkarni theeffectofgeometricaloverlapbetweengiantmagnetoresistancesensorandmagneticfluxconcentratorsanovelcombshapedsensorforimprovedsensitivity AT hitoshiiwasaki theeffectofgeometricaloverlapbetweengiantmagnetoresistancesensorandmagneticfluxconcentratorsanovelcombshapedsensorforimprovedsensitivity AT tomoyanakatani theeffectofgeometricaloverlapbetweengiantmagnetoresistancesensorandmagneticfluxconcentratorsanovelcombshapedsensorforimprovedsensitivity AT prabhanjandkulkarni effectofgeometricaloverlapbetweengiantmagnetoresistancesensorandmagneticfluxconcentratorsanovelcombshapedsensorforimprovedsensitivity AT hitoshiiwasaki effectofgeometricaloverlapbetweengiantmagnetoresistancesensorandmagneticfluxconcentratorsanovelcombshapedsensorforimprovedsensitivity AT tomoyanakatani effectofgeometricaloverlapbetweengiantmagnetoresistancesensorandmagneticfluxconcentratorsanovelcombshapedsensorforimprovedsensitivity |