Graduate Thesis Or Dissertation
 

Characterizing spin-orbit torques in β-W/Ta/CoFeB/MgO devices

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/3r075343v

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  • Materials with a strong spin Hall effect and Rashba-Edelstein effect have the potential to improve the efficiency of solid-state magnetic memory technologies and other magnetic logic devices. Heavy metals have been identified as having these properties, including the beta crystal phase of tungsten. In this work, we determine the strength of the current-induced spin-orbit torques in a β−W/Ta/CoFeB/MgO materials stack using the second harmonic Hall measurement technique. The measured spin-orbit torques are found to be comparable to values reported in literature for similar stacks including tungsten. The inclusion of a thin insert layer of tantalum enhances the perpendicular magnetic anisotropy in the CoFeB layer without significantly reducing the spin-orbit torques. Enhanced perpendicular anisotropy is beneficial for the stability of magnetic memory devices. The choice of tantalum for the insert layer is of particular advantage as the material is already frequently used in integrated circuit fabrication processes.
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