A Spin Valve-Based Rhombus-Shaped Micro-Object Implementing a Full Wheatstone Bridge
Spin valves with a synthetic antiferromagnet were fabricated via magnetron sputtering. It was shown that the fabricated spin valve layers had a perfect microstructure and smooth interfaces, and therefore, an RKKY interaction dominated in the coupling of the ferromagnetic layers separated by a copper...
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| Format: | Article |
| Language: | English |
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MDPI AG
2024-01-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/24/2/625 |
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| author | Mikhail Milyaev Larisa Naumova Anastasiya Germizina Tatyana Chernyshova Anastasia Pavlova Tatiana Krinitsina Vyacheslav Proglyado Vladimir Ustinov |
| author_facet | Mikhail Milyaev Larisa Naumova Anastasiya Germizina Tatyana Chernyshova Anastasia Pavlova Tatiana Krinitsina Vyacheslav Proglyado Vladimir Ustinov |
| author_sort | Mikhail Milyaev |
| collection | DOAJ |
| description | Spin valves with a synthetic antiferromagnet were fabricated via magnetron sputtering. It was shown that the fabricated spin valve layers had a perfect microstructure and smooth interfaces, and therefore, an RKKY interaction dominated in the coupling of the ferromagnetic layers separated by a copper spacer. Rhombus-shaped micro-objects were fabricated from a single spin valve film. The thermomagnetic treatment procedure was found to form unidirectional anisotropy in the micro-object such that the values of the exchange bias fields in the rhombus’ nonparallel sides were opposite in sign. For the CoFeNi/Ru/CoFeNi synthetic antiferromagnet, we determined the differences between the ferromagnetic layer thicknesses at which the thermomagnetic treatment formed the same exchange bias all over each rhombus’ side. We also fabricated a sensor element in which each side of the rhombus was the shoulder of a Wheatstone bridge. After the thermomagnetic treatment procedure, each shoulder worked as an active magnetosensitive element, enabling the device to operate as a full Wheatstone bridge. The sensor output exhibited a step shape, high sensitivity to field changes, and significant magnetic hysteresis. Such characteristics are suitable for switching devices. |
| first_indexed | 2024-03-08T09:47:16Z |
| format | Article |
| id | doaj.art-fb1579876ba141fa9fe3410bf8455f6b |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-08T09:47:16Z |
| publishDate | 2024-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-fb1579876ba141fa9fe3410bf8455f6b2024-01-29T14:17:24ZengMDPI AGSensors1424-82202024-01-0124262510.3390/s24020625A Spin Valve-Based Rhombus-Shaped Micro-Object Implementing a Full Wheatstone BridgeMikhail Milyaev0Larisa Naumova1Anastasiya Germizina2Tatyana Chernyshova3Anastasia Pavlova4Tatiana Krinitsina5Vyacheslav Proglyado6Vladimir Ustinov7M.N. Mikheev lnstitute of Metal Physics, Ural Branch, Russian Academy of Sciences, S. Kovalevskoi Street 18, Ekaterinburg 620990, RussiaM.N. Mikheev lnstitute of Metal Physics, Ural Branch, Russian Academy of Sciences, S. Kovalevskoi Street 18, Ekaterinburg 620990, RussiaM.N. Mikheev lnstitute of Metal Physics, Ural Branch, Russian Academy of Sciences, S. Kovalevskoi Street 18, Ekaterinburg 620990, RussiaM.N. Mikheev lnstitute of Metal Physics, Ural Branch, Russian Academy of Sciences, S. Kovalevskoi Street 18, Ekaterinburg 620990, RussiaM.N. Mikheev lnstitute of Metal Physics, Ural Branch, Russian Academy of Sciences, S. Kovalevskoi Street 18, Ekaterinburg 620990, RussiaM.N. Mikheev lnstitute of Metal Physics, Ural Branch, Russian Academy of Sciences, S. Kovalevskoi Street 18, Ekaterinburg 620990, RussiaM.N. Mikheev lnstitute of Metal Physics, Ural Branch, Russian Academy of Sciences, S. Kovalevskoi Street 18, Ekaterinburg 620990, RussiaM.N. Mikheev lnstitute of Metal Physics, Ural Branch, Russian Academy of Sciences, S. Kovalevskoi Street 18, Ekaterinburg 620990, RussiaSpin valves with a synthetic antiferromagnet were fabricated via magnetron sputtering. It was shown that the fabricated spin valve layers had a perfect microstructure and smooth interfaces, and therefore, an RKKY interaction dominated in the coupling of the ferromagnetic layers separated by a copper spacer. Rhombus-shaped micro-objects were fabricated from a single spin valve film. The thermomagnetic treatment procedure was found to form unidirectional anisotropy in the micro-object such that the values of the exchange bias fields in the rhombus’ nonparallel sides were opposite in sign. For the CoFeNi/Ru/CoFeNi synthetic antiferromagnet, we determined the differences between the ferromagnetic layer thicknesses at which the thermomagnetic treatment formed the same exchange bias all over each rhombus’ side. We also fabricated a sensor element in which each side of the rhombus was the shoulder of a Wheatstone bridge. After the thermomagnetic treatment procedure, each shoulder worked as an active magnetosensitive element, enabling the device to operate as a full Wheatstone bridge. The sensor output exhibited a step shape, high sensitivity to field changes, and significant magnetic hysteresis. Such characteristics are suitable for switching devices.https://www.mdpi.com/1424-8220/24/2/625spin valveWheatstone bridgemagnetic anisotropyshape anisotropyexchange bias field |
| spellingShingle | Mikhail Milyaev Larisa Naumova Anastasiya Germizina Tatyana Chernyshova Anastasia Pavlova Tatiana Krinitsina Vyacheslav Proglyado Vladimir Ustinov A Spin Valve-Based Rhombus-Shaped Micro-Object Implementing a Full Wheatstone Bridge Sensors spin valve Wheatstone bridge magnetic anisotropy shape anisotropy exchange bias field |
| title | A Spin Valve-Based Rhombus-Shaped Micro-Object Implementing a Full Wheatstone Bridge |
| title_full | A Spin Valve-Based Rhombus-Shaped Micro-Object Implementing a Full Wheatstone Bridge |
| title_fullStr | A Spin Valve-Based Rhombus-Shaped Micro-Object Implementing a Full Wheatstone Bridge |
| title_full_unstemmed | A Spin Valve-Based Rhombus-Shaped Micro-Object Implementing a Full Wheatstone Bridge |
| title_short | A Spin Valve-Based Rhombus-Shaped Micro-Object Implementing a Full Wheatstone Bridge |
| title_sort | spin valve based rhombus shaped micro object implementing a full wheatstone bridge |
| topic | spin valve Wheatstone bridge magnetic anisotropy shape anisotropy exchange bias field |
| url | https://www.mdpi.com/1424-8220/24/2/625 |
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