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Determination of damping and spin mixing conductance in highly Bi-doped Cu/YIG thin films

AuthorsRuiz-Gómez, Sandra; Muñoz Sánchez, Manuel ; Guerrero, Rubén; Amado, Mario; Robinson, J. W. A.; Mascaraque, Arantzazu ; Pérez, Lucas
Issue Date15-Jul-2018
Citation21st International Conference on Magnetism (2018)
AbstractMaterials that may exhibit a giant Spin Hall Effect (SHE) have recently received attention due to the possibility of converting an electric current into a spin current without the need of ferromagnets [1]. In addition to the small intrinsic SHE in pure metals, scattering on impurities with strong spinorbit coupling can contribute to an enhanced SHE. Recent theoretical papers have proposed that alloys of Bi diluted in a Cu matrix should show giant SHE [2,3]. However, in order to attain high SHE values relatively large Bi concentrations are mandatory[4,5]. In this work we incorporate up to 10% of Bi atoms into the Cu structure by co-evaporation of Bi and Cu atoms in a molecular beam epitaxy system at room temperature. We investigate the spin pumping effect in a series of yttrium-iron-garnet (YIG)–Cu(Bi) bilayers by the measurement of broadband ferromagnetic resonance. We determine the effective spin-mixing conductance as a function of Bi concentration from ferromagnetic resonance measurements on pure YIG layers as well as on Cu(Bi)/YIG bilayers in a frequency range from 2-10GHz. With a Cu(Bi) layer on top of the YIG the Hilbert damping is significantly enhanced (up to 40%) for samples with higher Bi concentrations, as can be seen in the figure. The effective spin-mixing conductance extracted from the ferromagnetic resonance experiments increase with the Bi concentrations up to a value of Geff = 7.3x1018 m-2, which is at least twice the value measured in similar Pt/YIG structures. This makes Cu(Bi) a promising material for spintronics applications
DescriptionTrabajo presentado en el 21st International Conference on Magnetism (ICM2018), celebrado en San Francisco (California, EE.UU.), del 15 al 20 de julio de 2018
Appears in Collections:(IMN-CNM) Comunicaciones congresos
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