Journal
NATURE NANOTECHNOLOGY
Volume 11, Issue 7, Pages 621-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NNANO.2016.29
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Funding
- R&D Project for ICT Key Technology to Realize Future Society of MEXT
- R&D Subsidiary Program for the Promotion of Academia-Industry Cooperation of METI
- ImPACT Program of CSTI
- JSPS KAKENHI [15K13964, 15J04691]
- Grants-in-Aid for Scientific Research [15K13964, 15J04691] Funding Source: KAKEN
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Spin-orbit torque, a torque brought about by in-plane current via the spin-orbit interactions in heavy-metal/ferromagnet nanostructures, provides a new pathway to switch the magnetization direction. Although there are many recent studies, they all build on one of two structures that have the easy axis of a nanomagnet lying orthogonal to the current, that is, along the z or y axes. Here, we present a new structure with the third geometry, that is, with the easy axis collinear with the current (along the x axis). We fabricate a three-terminal device with a Ta/CoFeB/MgO-based stack and demonstrate the switching operation driven by the spin-orbit torque due to Ta with a negative spin Hall angle. Comparisons with different geometries highlight the previously unknown mechanisms of spin-orbit torque switching. Our work offers a new avenue for exploring the physics of spin-orbit torque switching and its application to spintronics devices.
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