Spin-current mediated exchange coupling in MgO-based magnetic tunnel junctions
Heterostructures composed of ferromagnetic layers that are mutually interacting through a nonmagnetic spacer are at the core of magnetic sensor and memory devices. In the present study, layer-resolved ferromagnetic resonance was used to investigate the coupling between the magnetic layers of a Co/Mg...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
American Physical Society
2021
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| _version_ | 1826275102943084544 |
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| author | Gladczuk, L Gladczuk, L Dluzewski, P Lasek, K Aleshkevych, P Burn, DB van der Laan, G Hesjedal, T |
| author_facet | Gladczuk, L Gladczuk, L Dluzewski, P Lasek, K Aleshkevych, P Burn, DB van der Laan, G Hesjedal, T |
| author_sort | Gladczuk, L |
| collection | OXFORD |
| description | Heterostructures composed of ferromagnetic layers that are mutually interacting through a nonmagnetic spacer are at the core of magnetic sensor and memory devices. In the present study, layer-resolved ferromagnetic resonance was used to investigate the coupling between the magnetic layers of a Co/MgO/Permalloy magnetic tunnel junction. Two magnetic resonance peaks were observed for both magnetic layers, as probed at the Co and Ni L3 x-ray absorption edges, showing a strong interlayer interaction through the insulating MgO barrier. A theoretical model based on the Landau-Lifshitz-Gilbert-Slonczewski equation was developed, including exchange coupling and spin pumping between the magnetic layers. Fits to the experimental data were carried out, both with and without a spin pumping term, and the goodness of the fit was compared using a likelihood ratio test. This rigorous statistical approach provides an unambiguous proof of the existence of interlayer coupling mediated by spin pumping. |
| first_indexed | 2024-03-06T22:53:36Z |
| format | Journal article |
| id | oxford-uuid:5f9f51d0-1f6a-4e92-a5da-3f9f921ada75 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T22:53:36Z |
| publishDate | 2021 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:5f9f51d0-1f6a-4e92-a5da-3f9f921ada752022-03-26T17:48:09ZSpin-current mediated exchange coupling in MgO-based magnetic tunnel junctionsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:5f9f51d0-1f6a-4e92-a5da-3f9f921ada75EnglishSymplectic ElementsAmerican Physical Society2021Gladczuk, LGladczuk, LDluzewski, PLasek, KAleshkevych, PBurn, DBvan der Laan, GHesjedal, THeterostructures composed of ferromagnetic layers that are mutually interacting through a nonmagnetic spacer are at the core of magnetic sensor and memory devices. In the present study, layer-resolved ferromagnetic resonance was used to investigate the coupling between the magnetic layers of a Co/MgO/Permalloy magnetic tunnel junction. Two magnetic resonance peaks were observed for both magnetic layers, as probed at the Co and Ni L3 x-ray absorption edges, showing a strong interlayer interaction through the insulating MgO barrier. A theoretical model based on the Landau-Lifshitz-Gilbert-Slonczewski equation was developed, including exchange coupling and spin pumping between the magnetic layers. Fits to the experimental data were carried out, both with and without a spin pumping term, and the goodness of the fit was compared using a likelihood ratio test. This rigorous statistical approach provides an unambiguous proof of the existence of interlayer coupling mediated by spin pumping. |
| spellingShingle | Gladczuk, L Gladczuk, L Dluzewski, P Lasek, K Aleshkevych, P Burn, DB van der Laan, G Hesjedal, T Spin-current mediated exchange coupling in MgO-based magnetic tunnel junctions |
| title | Spin-current mediated exchange coupling in MgO-based magnetic tunnel junctions |
| title_full | Spin-current mediated exchange coupling in MgO-based magnetic tunnel junctions |
| title_fullStr | Spin-current mediated exchange coupling in MgO-based magnetic tunnel junctions |
| title_full_unstemmed | Spin-current mediated exchange coupling in MgO-based magnetic tunnel junctions |
| title_short | Spin-current mediated exchange coupling in MgO-based magnetic tunnel junctions |
| title_sort | spin current mediated exchange coupling in mgo based magnetic tunnel junctions |
| work_keys_str_mv | AT gladczukl spincurrentmediatedexchangecouplinginmgobasedmagnetictunneljunctions AT gladczukl spincurrentmediatedexchangecouplinginmgobasedmagnetictunneljunctions AT dluzewskip spincurrentmediatedexchangecouplinginmgobasedmagnetictunneljunctions AT lasekk spincurrentmediatedexchangecouplinginmgobasedmagnetictunneljunctions AT aleshkevychp spincurrentmediatedexchangecouplinginmgobasedmagnetictunneljunctions AT burndb spincurrentmediatedexchangecouplinginmgobasedmagnetictunneljunctions AT vanderlaang spincurrentmediatedexchangecouplinginmgobasedmagnetictunneljunctions AT hesjedalt spincurrentmediatedexchangecouplinginmgobasedmagnetictunneljunctions |