Magneto-ionic effect in CoFeB thin films with in-plane and perpendicular-to-plane magnetic anisotropy
The magneto-ionic effect is a promising method to control the magnetic properties electrically. Charged mobile oxygen ions can easily be driven by an electric field to modify the magnetic anisotropy of a ferromagnetic layer in contact with an ionic conductor in a solid-state device. In this paper, w...
| Main Authors: | , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Published: |
American Institute of Physics (AIP)
2018
|
| Online Access: | http://hdl.handle.net/1721.1/113220 https://orcid.org/0000-0002-6858-8424 https://orcid.org/0000-0002-8719-2652 |
| _version_ | 1811079328799129600 |
|---|---|
| author | Bertacco, R. Baldrati, Lorenzo 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 Bertacco, R. Baldrati, Lorenzo Tan, Aik Jun Mann, Maxwell Beach, Geoffrey Stephen |
| author_sort | Bertacco, R. |
| collection | MIT |
| description | The magneto-ionic effect is a promising method to control the magnetic properties electrically. Charged mobile oxygen ions can easily be driven by an electric field to modify the magnetic anisotropy of a ferromagnetic layer in contact with an ionic conductor in a solid-state device. In this paper, we report on the room temperature magneto-ionic modulation of the magnetic anisotropy of ultrathin CoFeB films in contact with a GdO[subscript x] layer, as probed by polar micro-Magneto Optical Kerr Effect during the application of a voltage across patterned capacitors. Both Pt/CoFeB/GdO[subscript x] films with perpendicular magnetic anisotropy and Ta/CoFeB/GdO[subscript x] films with uniaxial in-plane magnetic anisotropy in the as-grown state exhibit a sizable dependence of the magnetic anisotropy on the voltage (amplitude, polarity, and time) applied across the oxide. In Pt/CoFeB/GdO[subscript x] multilayers, it is possible to reorient the magnetic anisotropy from perpendicular-to-plane to in-plane, with a variation of the magnetic anisotropy energy greater than 0.2 mJ m[subscript -2]. As for Ta/CoFeB/GdO[subscript x] multilayers, magneto-ionic effects still lead to a sizable variation of the in-plane magnetic anisotropy, but the anisotropy axis remains in-plane. |
| first_indexed | 2024-09-23T11:13:28Z |
| format | Article |
| id | mit-1721.1/113220 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T11:13:28Z |
| publishDate | 2018 |
| publisher | American Institute of Physics (AIP) |
| record_format | dspace |
| spelling | mit-1721.1/1132202022-09-27T17:59:25Z Magneto-ionic effect in CoFeB thin films with in-plane and perpendicular-to-plane magnetic anisotropy Bertacco, R. Baldrati, Lorenzo Tan, Aik Jun Mann, Maxwell Beach, Geoffrey Stephen Massachusetts Institute of Technology. Department of Materials Science and Engineering Baldrati, Lorenzo Tan, Aik Jun Mann, Maxwell Beach, Geoffrey Stephen The magneto-ionic effect is a promising method to control the magnetic properties electrically. Charged mobile oxygen ions can easily be driven by an electric field to modify the magnetic anisotropy of a ferromagnetic layer in contact with an ionic conductor in a solid-state device. In this paper, we report on the room temperature magneto-ionic modulation of the magnetic anisotropy of ultrathin CoFeB films in contact with a GdO[subscript x] layer, as probed by polar micro-Magneto Optical Kerr Effect during the application of a voltage across patterned capacitors. Both Pt/CoFeB/GdO[subscript x] films with perpendicular magnetic anisotropy and Ta/CoFeB/GdO[subscript x] films with uniaxial in-plane magnetic anisotropy in the as-grown state exhibit a sizable dependence of the magnetic anisotropy on the voltage (amplitude, polarity, and time) applied across the oxide. In Pt/CoFeB/GdO[subscript x] multilayers, it is possible to reorient the magnetic anisotropy from perpendicular-to-plane to in-plane, with a variation of the magnetic anisotropy energy greater than 0.2 mJ m[subscript -2]. As for Ta/CoFeB/GdO[subscript x] multilayers, magneto-ionic effects still lead to a sizable variation of the in-plane magnetic anisotropy, but the anisotropy axis remains in-plane. 2018-01-18T14:22:18Z 2018-01-18T14:22:18Z 2017-01 2016-08 2018-01-16T18:36:58Z Article http://purl.org/eprint/type/JournalArticle 0003-6951 1077-3118 http://hdl.handle.net/1721.1/113220 Baldrati, L. et al. “Magneto-Ionic Effect in CoFeB Thin Films with in-Plane and Perpendicular-to-Plane Magnetic Anisotropy.” Applied Physics Letters 110, 1 (January 2017): 012404 © 2017 Author(s) https://orcid.org/0000-0002-6858-8424 https://orcid.org/0000-0002-8719-2652 http://dx.doi.org/10.1063/1.4973475 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 | Bertacco, R. Baldrati, Lorenzo Tan, Aik Jun Mann, Maxwell Beach, Geoffrey Stephen Magneto-ionic effect in CoFeB thin films with in-plane and perpendicular-to-plane magnetic anisotropy |
| title | Magneto-ionic effect in CoFeB thin films with in-plane and perpendicular-to-plane magnetic anisotropy |
| title_full | Magneto-ionic effect in CoFeB thin films with in-plane and perpendicular-to-plane magnetic anisotropy |
| title_fullStr | Magneto-ionic effect in CoFeB thin films with in-plane and perpendicular-to-plane magnetic anisotropy |
| title_full_unstemmed | Magneto-ionic effect in CoFeB thin films with in-plane and perpendicular-to-plane magnetic anisotropy |
| title_short | Magneto-ionic effect in CoFeB thin films with in-plane and perpendicular-to-plane magnetic anisotropy |
| title_sort | magneto ionic effect in cofeb thin films with in plane and perpendicular to plane magnetic anisotropy |
| url | http://hdl.handle.net/1721.1/113220 https://orcid.org/0000-0002-6858-8424 https://orcid.org/0000-0002-8719-2652 |
| work_keys_str_mv | AT bertaccor magnetoioniceffectincofebthinfilmswithinplaneandperpendiculartoplanemagneticanisotropy AT baldratilorenzo magnetoioniceffectincofebthinfilmswithinplaneandperpendiculartoplanemagneticanisotropy AT tanaikjun magnetoioniceffectincofebthinfilmswithinplaneandperpendiculartoplanemagneticanisotropy AT mannmaxwell magnetoioniceffectincofebthinfilmswithinplaneandperpendiculartoplanemagneticanisotropy AT beachgeoffreystephen magnetoioniceffectincofebthinfilmswithinplaneandperpendiculartoplanemagneticanisotropy |