Controlling interface anisotropy in CoFeB/MgO/HfO2 using dusting layers and magneto-ionic gating
Creators
- 1. Centre de Nanosciences et de Nanotechnologies, CNRS, Université Paris-Saclay, 91120 Palaiseau, France
- 2. Forschungszentrum Jülich GmbH, Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute (PGI-5), 52425 Jülich, Germany
- 3. Laboratoire des Sciences des Procédés et des Matériaux, CNRS-UPR 3407, Université Sorbonne Paris Nord, 93430 Villetaneuse, France
- 4. CNR-IMM, Agrate Unit, Via C. Olivetti 2, 20864 Agrate Brianza (MB), Italy
- 5. Singulus Technologies AG, Hanauer Landstrasse 103, 63796 Kahl am Main, Germany
- 6. Unitée Mixte de Physique CNRS/Thales, Université Paris-Saclay, 91767 Palaiseau, France
- 7. Central Research Institute of Electric Power Industry, Yokosuka, Kanagawa 240-0196, Japan
- 8. Synchrotron SOLEIL, L'Orme des Merisiers, 91190 Saint-Aubin, France
- 9. Spin-Ion Technologies, C2N, 10 Boulevard Thomas Gobert, 91120 Palaiseau, France
- 10. SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
Description
n this work, we present the magneto-ionic response to ionic liquid gating in Ta/CoFeB/MgO/HfO2 stacks, where heavy metal dusting layers of Ta, W, and Pt are inserted at the Ta/CoFeB and CoFeB/MgO interfaces. Dusting layers of W inserted at the Ta/CoFeB interface increase perpendicular magnetic anisotropy (PMA) by more than 50%, while no significant changes are seen for Pt. In these samples, gating cannot break the PMA seeded at the CoFeB/MgO interface, only relatively small changes in the coercivity can be induced, about 20% for Ta and Pt and 6% for W. At the CoFeB/MgO interface, a significant quenching of the magnetization is seen when W and Ta dusting layers are inserted, which remains unchanged after gating, suggesting a critical deterioration of the CoFeB. In contrast, Pt dusting layers result in an in-plane anisotropy that can be reversibly converted to PMA through magneto-ionic gating while preserving the polycrystalline structure of the MgO layer. This shows that dusting layers can be effectively used not only to engineer magnetic properties in multilayers but also to strongly modify their magneto-ionic performance.
Files
APL 122.pdf
Files
(6.7 MB)
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