Continuous film spin-orbit torque characterization via four probe measurement
Spin-orbit torque (SOT) characterization techniques generally require the Hall cross that generally demands lithography resources and time. It is highly desirable to characterize SOT efficiencies with minimal sample processing time. Here, we demonstrate a lithography-free technique to determine the...
| Κύριοι συγγραφείς: | , , , , , , , |
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| Άλλοι συγγραφείς: | |
| Μορφή: | Journal Article |
| Γλώσσα: | English |
| Έκδοση: |
2022
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| Θέματα: | |
| Διαθέσιμο Online: | https://hdl.handle.net/10356/161223 |
| _version_ | 1826109483029364736 |
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| author | Poh, Han Yin Ang, Calvin Ching Ian Jin, Tianli Tan, Funan Lim, Gerard Joseph Wu, Shuo Poh, Francis Lew, Wen Siang |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Poh, Han Yin Ang, Calvin Ching Ian Jin, Tianli Tan, Funan Lim, Gerard Joseph Wu, Shuo Poh, Francis Lew, Wen Siang |
| author_sort | Poh, Han Yin |
| collection | NTU |
| description | Spin-orbit torque (SOT) characterization techniques generally require the Hall cross that generally demands lithography resources and time. It is highly desirable to characterize SOT efficiencies with minimal sample processing time. Here, we demonstrate a lithography-free technique to determine the spin-orbit torque efficiency in a perpendicular magnetic anisotropy ferromagnetic heterostructure. By utilizing a customized four-point probe in a rhombus geometry, harmonic Hall measurement was performed on continuous films of a Pt/Co/Ti structure to characterize the spin-orbit torque efficiency. A correction factor, which is due to the non-uniform current distribution across the continuous film, was experimentally evaluated by taking the ratio of the measured damping-like field of the continuous film to that of a fabricated Hall device. Additionally, this correction factor is analytically derived and experimentally shown to be determined by the configuration of the probes and is independent of the structure material. Our measurement reveals that by performing a single calibration process for the particular set of probes, the same correction factor was validated on a second ferromagnetic heterostructure, Ti/Pt/Co/Ta; hence, it can be applied to other SOT films' stack measurements. Our four-probe harmonic Hall technique provides an alternative and swift way for SOT investigations by eliminating multiple lithography processes necessary in conventional approaches. |
| first_indexed | 2024-10-01T02:18:56Z |
| format | Journal Article |
| id | ntu-10356/161223 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:18:56Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1612232023-02-28T20:11:13Z Continuous film spin-orbit torque characterization via four probe measurement Poh, Han Yin Ang, Calvin Ching Ian Jin, Tianli Tan, Funan Lim, Gerard Joseph Wu, Shuo Poh, Francis Lew, Wen Siang School of Physical and Mathematical Sciences Science::Physics Spin-Orbit Torque Lithography Spin-orbit torque (SOT) characterization techniques generally require the Hall cross that generally demands lithography resources and time. It is highly desirable to characterize SOT efficiencies with minimal sample processing time. Here, we demonstrate a lithography-free technique to determine the spin-orbit torque efficiency in a perpendicular magnetic anisotropy ferromagnetic heterostructure. By utilizing a customized four-point probe in a rhombus geometry, harmonic Hall measurement was performed on continuous films of a Pt/Co/Ti structure to characterize the spin-orbit torque efficiency. A correction factor, which is due to the non-uniform current distribution across the continuous film, was experimentally evaluated by taking the ratio of the measured damping-like field of the continuous film to that of a fabricated Hall device. Additionally, this correction factor is analytically derived and experimentally shown to be determined by the configuration of the probes and is independent of the structure material. Our measurement reveals that by performing a single calibration process for the particular set of probes, the same correction factor was validated on a second ferromagnetic heterostructure, Ti/Pt/Co/Ta; hence, it can be applied to other SOT films' stack measurements. Our four-probe harmonic Hall technique provides an alternative and swift way for SOT investigations by eliminating multiple lithography processes necessary in conventional approaches. Agency for Science, Technology and Research (A*STAR) Economic Development Board (EDB) Submitted/Accepted version This work was supported by Research Innovation and Enterprise 2020 Agency for Science, Technology and Research Advanced Manufacturing and Engineering Industrial Alignment Fund - Industry Collaboration Projects (RIE 2020 ASTAR AME IAF-ICP) (Grant No. I1801E0030) and EDB-IPP: Economic Development Board - Industrial Postgraduate Program (Grant No. RCA-2019-1376). 2022-08-19T08:29:40Z 2022-08-19T08:29:40Z 2022 Journal Article Poh, H. Y., Ang, C. C. I., Jin, T., Tan, F., Lim, G. J., Wu, S., Poh, F. & Lew, W. S. (2022). Continuous film spin-orbit torque characterization via four probe measurement. Applied Physics Letters, 121(1), 012405-. https://dx.doi.org/10.1063/5.0092471 0003-6951 https://hdl.handle.net/10356/161223 10.1063/5.0092471 2-s2.0-85133971755 1 121 012405 en I1801E0030 RCA-2019-1376 Applied Physics Letters © 2022 Author(s). All rights reserved. This paper was published by AIP Publishing in Applied Physics Letters and is made available with permission of Author(s). application/pdf |
| spellingShingle | Science::Physics Spin-Orbit Torque Lithography Poh, Han Yin Ang, Calvin Ching Ian Jin, Tianli Tan, Funan Lim, Gerard Joseph Wu, Shuo Poh, Francis Lew, Wen Siang Continuous film spin-orbit torque characterization via four probe measurement |
| title | Continuous film spin-orbit torque characterization via four probe measurement |
| title_full | Continuous film spin-orbit torque characterization via four probe measurement |
| title_fullStr | Continuous film spin-orbit torque characterization via four probe measurement |
| title_full_unstemmed | Continuous film spin-orbit torque characterization via four probe measurement |
| title_short | Continuous film spin-orbit torque characterization via four probe measurement |
| title_sort | continuous film spin orbit torque characterization via four probe measurement |
| topic | Science::Physics Spin-Orbit Torque Lithography |
| url | https://hdl.handle.net/10356/161223 |
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