Reversible magneto ionics in crystallized W Co20Fe60B20 MgO HfO2 ultra-thin films with perpendicular magnetic anisotropy
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866909593199706112 |
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| author | Chen, Song Monteblanco, Elmer Borie, Benjamin Ono, Shimpei Ravelosona, Dafine |
| author_facet | Chen, Song Monteblanco, Elmer Borie, Benjamin Ono, Shimpei Ravelosona, Dafine |
| contents | We have investigated electric field (E-field) induced modulation of perpendicular magnetic anisotropy (PMA) in both amorphous and crystalline W/CoFeB/MgO/HfO2 ultra-thin films. We find that in the amorphous state, the E-field effect is volatile and reversible, which is consistent with the conventional electrostatic effect through charge accumulation and depletion. In the crystallized system annealed at 370°C, we find that two effects are at play, a non-volatile and reversible voltage-induced effect on PMA and an electrostatic response. We discuss these results in terms of higher oxygen mobility at the crystallized CoFeB-MgO interface, which induces a non-volatile magnetoionic response. Modulating PMA in crystallized CoFeB-MgO materials through ionic migration opens the path to integrating magneto-ionics in full magnetic tunnel junctions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_18248 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Reversible magneto ionics in crystallized W Co20Fe60B20 MgO HfO2 ultra-thin films with perpendicular magnetic anisotropy Chen, Song Monteblanco, Elmer Borie, Benjamin Ono, Shimpei Ravelosona, Dafine Materials Science Mesoscale and Nanoscale Physics Applied Physics We have investigated electric field (E-field) induced modulation of perpendicular magnetic anisotropy (PMA) in both amorphous and crystalline W/CoFeB/MgO/HfO2 ultra-thin films. We find that in the amorphous state, the E-field effect is volatile and reversible, which is consistent with the conventional electrostatic effect through charge accumulation and depletion. In the crystallized system annealed at 370°C, we find that two effects are at play, a non-volatile and reversible voltage-induced effect on PMA and an electrostatic response. We discuss these results in terms of higher oxygen mobility at the crystallized CoFeB-MgO interface, which induces a non-volatile magnetoionic response. Modulating PMA in crystallized CoFeB-MgO materials through ionic migration opens the path to integrating magneto-ionics in full magnetic tunnel junctions. |
| title | Reversible magneto ionics in crystallized W Co20Fe60B20 MgO HfO2 ultra-thin films with perpendicular magnetic anisotropy |
| topic | Materials Science Mesoscale and Nanoscale Physics Applied Physics |
| url | https://arxiv.org/abs/2502.18248 |