Spin pumping in magnetic trilayer structures with an MgO barrier
We present a study of the interaction mechanisms in magnetic trilayer structures with an MgO barrier grown by molecular beam epitaxy. The interlayer exchange coupling, Aex, is determined using SQUID magnetometry and ferromagnetic resonance (FMR), displaying an unexpected oscillatory behaviour as the...
| Main Authors: | , , , , , |
|---|---|
| Format: | Journal article |
| Published: |
Nature Publishing Group
2016
|
| _version_ | 1826264584588099584 |
|---|---|
| author | Baker, A Figueroa, A Pingstone, D Lazarov, V van der Laan, G Hesjedal, T |
| author_facet | Baker, A Figueroa, A Pingstone, D Lazarov, V van der Laan, G Hesjedal, T |
| author_sort | Baker, A |
| collection | OXFORD |
| description | We present a study of the interaction mechanisms in magnetic trilayer structures with an MgO barrier grown by molecular beam epitaxy. The interlayer exchange coupling, Aex, is determined using SQUID magnetometry and ferromagnetic resonance (FMR), displaying an unexpected oscillatory behaviour as the thickness, tMgO, is increased from 1 to 4 nm. Transmission electron microscopy confirms the continuity and quality of the tunnelling barrier, eliminating the prospect of exchange arising from direct contact between the two ferromagnetic layers. The Gilbert damping is found to be almost independent of the MgO thickness, suggesting the suppression of spin pumping. The element-specific technique of x-ray detected FMR reveals a small dynamic exchange interaction, acting in concert with the static interaction to induce coupled precession across the multilayer stack. These results highlight the potential of spin pumping and spin transfer torque for device applications in magnetic tunnel junctions relying on commonly used MgO barriers. |
| first_indexed | 2024-03-06T20:10:11Z |
| format | Journal article |
| id | oxford-uuid:2a49847f-930e-40b2-acaf-139ba6b48434 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T20:10:11Z |
| publishDate | 2016 |
| publisher | Nature Publishing Group |
| record_format | dspace |
| spelling | oxford-uuid:2a49847f-930e-40b2-acaf-139ba6b484342022-03-26T12:24:10ZSpin pumping in magnetic trilayer structures with an MgO barrierJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:2a49847f-930e-40b2-acaf-139ba6b48434Symplectic Elements at OxfordNature Publishing Group2016Baker, AFigueroa, APingstone, DLazarov, Vvan der Laan, GHesjedal, TWe present a study of the interaction mechanisms in magnetic trilayer structures with an MgO barrier grown by molecular beam epitaxy. The interlayer exchange coupling, Aex, is determined using SQUID magnetometry and ferromagnetic resonance (FMR), displaying an unexpected oscillatory behaviour as the thickness, tMgO, is increased from 1 to 4 nm. Transmission electron microscopy confirms the continuity and quality of the tunnelling barrier, eliminating the prospect of exchange arising from direct contact between the two ferromagnetic layers. The Gilbert damping is found to be almost independent of the MgO thickness, suggesting the suppression of spin pumping. The element-specific technique of x-ray detected FMR reveals a small dynamic exchange interaction, acting in concert with the static interaction to induce coupled precession across the multilayer stack. These results highlight the potential of spin pumping and spin transfer torque for device applications in magnetic tunnel junctions relying on commonly used MgO barriers. |
| spellingShingle | Baker, A Figueroa, A Pingstone, D Lazarov, V van der Laan, G Hesjedal, T Spin pumping in magnetic trilayer structures with an MgO barrier |
| title | Spin pumping in magnetic trilayer structures with an MgO barrier |
| title_full | Spin pumping in magnetic trilayer structures with an MgO barrier |
| title_fullStr | Spin pumping in magnetic trilayer structures with an MgO barrier |
| title_full_unstemmed | Spin pumping in magnetic trilayer structures with an MgO barrier |
| title_short | Spin pumping in magnetic trilayer structures with an MgO barrier |
| title_sort | spin pumping in magnetic trilayer structures with an mgo barrier |
| work_keys_str_mv | AT bakera spinpumpinginmagnetictrilayerstructureswithanmgobarrier AT figueroaa spinpumpinginmagnetictrilayerstructureswithanmgobarrier AT pingstoned spinpumpinginmagnetictrilayerstructureswithanmgobarrier AT lazarovv spinpumpinginmagnetictrilayerstructureswithanmgobarrier AT vanderlaang spinpumpinginmagnetictrilayerstructureswithanmgobarrier AT hesjedalt spinpumpinginmagnetictrilayerstructureswithanmgobarrier |