Hydrogen-driven switching of the magnetic surface anisotropy at the Co/Pd interface
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Date
2019-03-05
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Publisher
American Physical Society
Abstract
Heterostructures exhibiting perpendicular magnetic anisotropy (PMA) have proven to be indispensable within the magnetic recording industry. By exploiting the hydrogen-induced modifications to PMA which occur exclusively at the ferromagnetic/Pd interface, an opportunity exists to expand the potential applications of PMA-based heterostructures into the realm of hydrogen sensing using ferromagnetic resonance (FMR) - an electron-spin based technology. Here, we present an interface-resolved in-operando study of a Co/Pd film which features tailorable PMA in the presence of hydrogen gas. We combine polarized neutron reflectometry with in-situ FMR to explore the nanoscopic interactions of hydrogen at the Co/Pd interface which affects the spin-resonance condition during hydrogen cycling. Key experimental data and theoretical modelling reveal that the interfacial PMA of the Co/Pd film suppresses non-reversibly upon primary exposure to hydrogen gas – highlighting a potential avenue for spintronics-based hydrogen sensing.
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Keywords
Hydrogen, Magnetic surfaces, Anisotropy, Interfaces, Ferromagnetic materials, Electron spin resonance, Neutron reflectors
Citation
Causer, G., Kostylev, M., Cortie, D., Wang, X., & Klose, F. (2019). Hydrogen-driven switching of the magnetic surface anisotropy at the Co/Pd interface. Presentation to the APS March Meeting 2019, Boston, Massachusetts, USA, 4-8 March 2019. In Bulletin of the American Physical Society, 64, (2), F39.00011. Retrieved from: https://meetings.aps.org/Meeting/MAR19/Session/F39.11