Effect of rare earth metal on the spin-orbit torque in magnetic heterostructures
We report the effect of the rare earth metal Gd on current-induced spin-orbit torques (SOTs) in perpendicularly magnetized Pt/Co/Gd heterostructures, characterized using harmonic measurements and spin-torque ferromagnetic resonance (ST-FMR). By varying the Gd metal layer thickness from 0 nm to 8 nm,...
| Main Authors: | , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Published: |
American Institute of Physics (AIP)
2017
|
| Online Access: | http://hdl.handle.net/1721.1/111661 https://orcid.org/0000-0003-4288-8573 https://orcid.org/0000-0002-6858-8424 https://orcid.org/0000-0002-8719-2652 |
| _version_ | 1811087713840922624 |
|---|---|
| author | Ueda, Kohei Pai, Chi-Feng Tan, Aik Jun Mann, Maxwell Beach, Geoffrey Stephen |
| author2 | Massachusetts Institute of Technology. Department of Materials Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Materials Science and Engineering Ueda, Kohei Pai, Chi-Feng Tan, Aik Jun Mann, Maxwell Beach, Geoffrey Stephen |
| author_sort | Ueda, Kohei |
| collection | MIT |
| description | We report the effect of the rare earth metal Gd on current-induced spin-orbit torques (SOTs) in perpendicularly magnetized Pt/Co/Gd heterostructures, characterized using harmonic measurements and spin-torque ferromagnetic resonance (ST-FMR). By varying the Gd metal layer thickness from 0 nm to 8 nm, harmonic measurements reveal a significant enhancement of the effective fields generated from the Slonczewski-like and field-like torques. ST-FMR measurements confirm an enhanced effective spin Hall angle and show a corresponding increase in the magnetic damping constant with increasing Gd thickness. These results suggest that Gd plays an active role in generating SOTs in these heterostructures. Our finding may lead to spin-orbitronics device application such as non-volatile magnetic random access memory, based on rare earth metals. |
| first_indexed | 2024-09-23T13:50:50Z |
| format | Article |
| id | mit-1721.1/111661 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T13:50:50Z |
| publishDate | 2017 |
| publisher | American Institute of Physics (AIP) |
| record_format | dspace |
| spelling | mit-1721.1/1116612022-09-28T16:35:46Z Effect of rare earth metal on the spin-orbit torque in magnetic heterostructures Ueda, Kohei Pai, Chi-Feng Tan, Aik Jun Mann, Maxwell Beach, Geoffrey Stephen Massachusetts Institute of Technology. Department of Materials Science and Engineering Ueda, Kohei Pai, Chi-Feng Tan, Aik Jun Mann, Maxwell Beach, Geoffrey Stephen We report the effect of the rare earth metal Gd on current-induced spin-orbit torques (SOTs) in perpendicularly magnetized Pt/Co/Gd heterostructures, characterized using harmonic measurements and spin-torque ferromagnetic resonance (ST-FMR). By varying the Gd metal layer thickness from 0 nm to 8 nm, harmonic measurements reveal a significant enhancement of the effective fields generated from the Slonczewski-like and field-like torques. ST-FMR measurements confirm an enhanced effective spin Hall angle and show a corresponding increase in the magnetic damping constant with increasing Gd thickness. These results suggest that Gd plays an active role in generating SOTs in these heterostructures. Our finding may lead to spin-orbitronics device application such as non-volatile magnetic random access memory, based on rare earth metals. National Science Foundation (U.S.) (NSF-ECCS-1408172) 2017-09-29T19:10:02Z 2017-09-29T19:10:02Z 2016-06 2016-03 2017-09-29T14:04:05Z Article http://purl.org/eprint/type/JournalArticle 0003-6951 1077-3118 http://hdl.handle.net/1721.1/111661 Ueda, Kohei et al. “Effect of Rare Earth Metal on the Spin-Orbit Torque in Magnetic Heterostructures.” Applied Physics Letters 108, 23 (June 2016): 232405 © 2016 Author(s) https://orcid.org/0000-0003-4288-8573 https://orcid.org/0000-0002-6858-8424 https://orcid.org/0000-0002-8719-2652 http://dx.doi.org/10.1063/1.4953348 Applied Physics Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Institute of Physics (AIP) MIT Web Domain |
| spellingShingle | Ueda, Kohei Pai, Chi-Feng Tan, Aik Jun Mann, Maxwell Beach, Geoffrey Stephen Effect of rare earth metal on the spin-orbit torque in magnetic heterostructures |
| title | Effect of rare earth metal on the spin-orbit torque in magnetic heterostructures |
| title_full | Effect of rare earth metal on the spin-orbit torque in magnetic heterostructures |
| title_fullStr | Effect of rare earth metal on the spin-orbit torque in magnetic heterostructures |
| title_full_unstemmed | Effect of rare earth metal on the spin-orbit torque in magnetic heterostructures |
| title_short | Effect of rare earth metal on the spin-orbit torque in magnetic heterostructures |
| title_sort | effect of rare earth metal on the spin orbit torque in magnetic heterostructures |
| url | http://hdl.handle.net/1721.1/111661 https://orcid.org/0000-0003-4288-8573 https://orcid.org/0000-0002-6858-8424 https://orcid.org/0000-0002-8719-2652 |
| work_keys_str_mv | AT uedakohei effectofrareearthmetalonthespinorbittorqueinmagneticheterostructures AT paichifeng effectofrareearthmetalonthespinorbittorqueinmagneticheterostructures AT tanaikjun effectofrareearthmetalonthespinorbittorqueinmagneticheterostructures AT mannmaxwell effectofrareearthmetalonthespinorbittorqueinmagneticheterostructures AT beachgeoffreystephen effectofrareearthmetalonthespinorbittorqueinmagneticheterostructures |