Modulation of spin-orbit torque efficiency by thickness control of heavy metal layers in Co/Pt multilayers
We investigate and quantify spin-orbit torque (SOT) strength by current induced effective in-plane magnetic fields and spin Hall angle (SHA) using AC harmonic Hall voltage measurements techniques on Ta/Pt/Co/Pt/Co/Ta thin film structures. The proposed Co/Pt thin film double stack gives property enha...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2017
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| Online Access: | https://hdl.handle.net/10356/85991 http://hdl.handle.net/10220/43902 |
| _version_ | 1824456567616962560 |
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| author | Sethi, Pankaj Krishnia, Sachin Li, Sihua Lew, Wen Siang |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Sethi, Pankaj Krishnia, Sachin Li, Sihua Lew, Wen Siang |
| author_sort | Sethi, Pankaj |
| collection | NTU |
| description | We investigate and quantify spin-orbit torque (SOT) strength by current induced effective in-plane magnetic fields and spin Hall angle (SHA) using AC harmonic Hall voltage measurements techniques on Ta/Pt/Co/Pt/Co/Ta thin film structures. The proposed Co/Pt thin film double stack gives property enhancement on thermal stability and perpendicular magnetization anisotropy strength over the single stack Pt/Co/Ta. In the proposed Co/Pt double stack we observed that increasing the Ta capping thickness to three times enhances the SHA in similar order, consistent with larger spin injection efficiency. Doubling the Pt spacer layer thickness reduces the SHA by nearly 1.4 times, due to partial cancellation of SOT by bottom layer Pt, negating the increase from the top Co/Pt interface. The in-plane current threshold for magnetization switching is lower with the increase of the SHA. |
| first_indexed | 2025-02-19T03:56:09Z |
| format | Journal Article |
| id | ntu-10356/85991 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:56:09Z |
| publishDate | 2017 |
| record_format | dspace |
| spelling | ntu-10356/859912020-03-07T12:37:05Z Modulation of spin-orbit torque efficiency by thickness control of heavy metal layers in Co/Pt multilayers Sethi, Pankaj Krishnia, Sachin Li, Sihua Lew, Wen Siang School of Physical and Mathematical Sciences Spin Orbit Torque Spin Hall Angle We investigate and quantify spin-orbit torque (SOT) strength by current induced effective in-plane magnetic fields and spin Hall angle (SHA) using AC harmonic Hall voltage measurements techniques on Ta/Pt/Co/Pt/Co/Ta thin film structures. The proposed Co/Pt thin film double stack gives property enhancement on thermal stability and perpendicular magnetization anisotropy strength over the single stack Pt/Co/Ta. In the proposed Co/Pt double stack we observed that increasing the Ta capping thickness to three times enhances the SHA in similar order, consistent with larger spin injection efficiency. Doubling the Pt spacer layer thickness reduces the SHA by nearly 1.4 times, due to partial cancellation of SOT by bottom layer Pt, negating the increase from the top Co/Pt interface. The in-plane current threshold for magnetization switching is lower with the increase of the SHA. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) 2017-10-16T07:44:14Z 2019-12-06T16:13:57Z 2017-10-16T07:44:14Z 2019-12-06T16:13:57Z 2016 Journal Article Sethi, P., Krishnia, S., Li, S., & Lew, W. S. (2016). Modulation of spin-orbit torque efficiency by thickness control of heavy metal layers in Co/Pt multilayers. Journal of Magnetism and Magnetic Materials, 426, 497-503. 0304-8853 https://hdl.handle.net/10356/85991 http://hdl.handle.net/10220/43902 10.1016/j.jmmm.2016.11.130 en Journal of Magnetism and Magnetic Materials © 2016 Elsevier B.V. |
| spellingShingle | Spin Orbit Torque Spin Hall Angle Sethi, Pankaj Krishnia, Sachin Li, Sihua Lew, Wen Siang Modulation of spin-orbit torque efficiency by thickness control of heavy metal layers in Co/Pt multilayers |
| title | Modulation of spin-orbit torque efficiency by thickness control of heavy metal layers in Co/Pt multilayers |
| title_full | Modulation of spin-orbit torque efficiency by thickness control of heavy metal layers in Co/Pt multilayers |
| title_fullStr | Modulation of spin-orbit torque efficiency by thickness control of heavy metal layers in Co/Pt multilayers |
| title_full_unstemmed | Modulation of spin-orbit torque efficiency by thickness control of heavy metal layers in Co/Pt multilayers |
| title_short | Modulation of spin-orbit torque efficiency by thickness control of heavy metal layers in Co/Pt multilayers |
| title_sort | modulation of spin orbit torque efficiency by thickness control of heavy metal layers in co pt multilayers |
| topic | Spin Orbit Torque Spin Hall Angle |
| url | https://hdl.handle.net/10356/85991 http://hdl.handle.net/10220/43902 |
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