Micron-Scale Anomalous Hall Sensors Based on Fe<i><sub>x</sub></i>Pt<sub>1−<i>x</i></sub> Thin Films with a Large Hall Angle and near the Spin-Reorientation Transition
In this work, we fabricate and characterize an energy-efficient anomalous Hall sensor based on soft-magnetic Fe<i><sub>x</sub></i>Pt<sub>1−<i>x</i></sub> thin films with a large anomalous Hall angle. By varying the composition of the Fe<i><sub...
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MDPI AG
2021-03-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/11/4/854 |
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| author | Kang Wang Yiou Zhang Shiyu Zhou Gang Xiao |
| author_facet | Kang Wang Yiou Zhang Shiyu Zhou Gang Xiao |
| author_sort | Kang Wang |
| collection | DOAJ |
| description | In this work, we fabricate and characterize an energy-efficient anomalous Hall sensor based on soft-magnetic Fe<i><sub>x</sub></i>Pt<sub>1−<i>x</i></sub> thin films with a large anomalous Hall angle. By varying the composition of the Fe<i><sub>x</sub></i>Pt<sub>1−<i>x</i></sub> alloy, its layer thickness and interfacial materials, the magnetization is tuned to be near the spin transition between the perpendicular and in-plane reorientations. We performed magneto-transport and noise characterizations on anomalous Hall sensors with a small sensing area of 20 × 20 µm<sup>2</sup> in the 180 to 350 K temperature range. We found the best performance in a 1.25-nm-thick Fe<sub>0.48</sub>Pt<sub>0.52</sub> sandwiched by two 1.6-nm-thick MgO layers at room temperature. The sensor has a large anomalous Hall angle of 1.95%. Moreover, it has the best field detectability of 237.5 nT/√Hz at 1 Hz and 15.3 nT/√Hz at 10 kHz, as well as a high dynamic reserve of 112.0 dB. These results suggest that the Fe<i><sub>x</sub></i>Pt<sub>1−<i>x</i></sub> alloy system is suitable for energy-efficient anomalous Hall sensors, particularly in micro-sensing applications. |
| first_indexed | 2024-03-10T12:51:05Z |
| format | Article |
| id | doaj.art-352f90ed8799491ca72c18da8e3bd6b1 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T12:51:05Z |
| publishDate | 2021-03-01 |
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| series | Nanomaterials |
| spelling | doaj.art-352f90ed8799491ca72c18da8e3bd6b12023-11-21T13:02:17ZengMDPI AGNanomaterials2079-49912021-03-0111485410.3390/nano11040854Micron-Scale Anomalous Hall Sensors Based on Fe<i><sub>x</sub></i>Pt<sub>1−<i>x</i></sub> Thin Films with a Large Hall Angle and near the Spin-Reorientation TransitionKang Wang0Yiou Zhang1Shiyu Zhou2Gang Xiao3Department of Physics, Brown University, Providence, RI 02912, USADepartment of Physics, Brown University, Providence, RI 02912, USADepartment of Physics, Brown University, Providence, RI 02912, USADepartment of Physics, Brown University, Providence, RI 02912, USAIn this work, we fabricate and characterize an energy-efficient anomalous Hall sensor based on soft-magnetic Fe<i><sub>x</sub></i>Pt<sub>1−<i>x</i></sub> thin films with a large anomalous Hall angle. By varying the composition of the Fe<i><sub>x</sub></i>Pt<sub>1−<i>x</i></sub> alloy, its layer thickness and interfacial materials, the magnetization is tuned to be near the spin transition between the perpendicular and in-plane reorientations. We performed magneto-transport and noise characterizations on anomalous Hall sensors with a small sensing area of 20 × 20 µm<sup>2</sup> in the 180 to 350 K temperature range. We found the best performance in a 1.25-nm-thick Fe<sub>0.48</sub>Pt<sub>0.52</sub> sandwiched by two 1.6-nm-thick MgO layers at room temperature. The sensor has a large anomalous Hall angle of 1.95%. Moreover, it has the best field detectability of 237.5 nT/√Hz at 1 Hz and 15.3 nT/√Hz at 10 kHz, as well as a high dynamic reserve of 112.0 dB. These results suggest that the Fe<i><sub>x</sub></i>Pt<sub>1−<i>x</i></sub> alloy system is suitable for energy-efficient anomalous Hall sensors, particularly in micro-sensing applications.https://www.mdpi.com/2079-4991/11/4/854anomalous Hall sensorsFePt alloysperpendicular magnetic anisotropyspin–orbit couplingnoise characterizationsmicro-sensing and imaging |
| spellingShingle | Kang Wang Yiou Zhang Shiyu Zhou Gang Xiao Micron-Scale Anomalous Hall Sensors Based on Fe<i><sub>x</sub></i>Pt<sub>1−<i>x</i></sub> Thin Films with a Large Hall Angle and near the Spin-Reorientation Transition Nanomaterials anomalous Hall sensors FePt alloys perpendicular magnetic anisotropy spin–orbit coupling noise characterizations micro-sensing and imaging |
| title | Micron-Scale Anomalous Hall Sensors Based on Fe<i><sub>x</sub></i>Pt<sub>1−<i>x</i></sub> Thin Films with a Large Hall Angle and near the Spin-Reorientation Transition |
| title_full | Micron-Scale Anomalous Hall Sensors Based on Fe<i><sub>x</sub></i>Pt<sub>1−<i>x</i></sub> Thin Films with a Large Hall Angle and near the Spin-Reorientation Transition |
| title_fullStr | Micron-Scale Anomalous Hall Sensors Based on Fe<i><sub>x</sub></i>Pt<sub>1−<i>x</i></sub> Thin Films with a Large Hall Angle and near the Spin-Reorientation Transition |
| title_full_unstemmed | Micron-Scale Anomalous Hall Sensors Based on Fe<i><sub>x</sub></i>Pt<sub>1−<i>x</i></sub> Thin Films with a Large Hall Angle and near the Spin-Reorientation Transition |
| title_short | Micron-Scale Anomalous Hall Sensors Based on Fe<i><sub>x</sub></i>Pt<sub>1−<i>x</i></sub> Thin Films with a Large Hall Angle and near the Spin-Reorientation Transition |
| title_sort | micron scale anomalous hall sensors based on fe i sub x sub i pt sub 1 i x i sub thin films with a large hall angle and near the spin reorientation transition |
| topic | anomalous Hall sensors FePt alloys perpendicular magnetic anisotropy spin–orbit coupling noise characterizations micro-sensing and imaging |
| url | https://www.mdpi.com/2079-4991/11/4/854 |
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