5d iridium oxide as a material for spin-current detection

Abstract

Devices based on pure spin currents have been attracting increasing attention as key ingredients for low-dissipation electronics. To integrate such spintronics devices into chargebased technologies, electric detection of spin currents is essential. The inverse spin Hall effect converts a spin current into an electric voltage through spin-orbit coupling. Noble metals such as Pt and Pd, and also Cu-based alloys, have been regarded as potential materials for a spincurrent injector, owing to the large direct spin Hall effect. Their spin Hall resistivity r SH , representing the performance as a detector, is not large enough, however, due mainly because of their low charge resistivity. Here we report that a binary 5d transition metal oxide, iridium oxide, overcomes the limitations encountered in noble metals and Cu-based alloys and shows a very large r SH B38 mO cm at room temperature.

Crossover between spin swapping and Hall effect in disordered systems

“…; see Refs. [30][31][32][33][34][35]), as well as in 3d transition metals [36]. Alternatively, it has been recently suggested that large spin Hall angle α H could be achieved by exploiting skew scattering on the resonant states of 5d or 4f impurities embedded in a light metal matrix, such as Cu or Al [37][38][39][40].…”

Observation of inverse spin Hall effect in bismuth selenide

“…Since Bi 2 Se 3 is a semiconductor, its resistivity is at least an order of magnitude higher than the heavy metals like Pt and hence the spin pumping induced ISHE voltage can be expected to be higher than that in the Pt [50]. Therefore, Bi 2 Se 3 can be a viable material for spin detection devices.…”

Universal scaling for the spin-electricity conversion on surface states of topological insulators

“…In spin pumping experiments, bilayers comprising ferromagnetic Ni 81 Fe 19 (permalloy, Py) and nonmagnetic Pt have been studied as a typical system [2][3][4][5][6]. Though Pt has been widely used for spin detection owing to its strong spin-orbit interaction, search of more efficient spin detectors is one of the urgent issues in the spintronics field [7,8].…”

“…In spin pumping experiments, bilayers comprising ferromagnetic Ni 81 Fe 19 (permalloy, Py) and nonmagnetic Pt have been studied as a typical system [2-6]. Though Pt has been widely used for spin detection owing to its strong spin-orbit interaction, search of more efficient spin detectors is one of the urgent issues in the spintronics field [7,8].A topological insulator (TI) is a promising material for spintronics application because of its potential for highly efficient spin-electricity conversion [9,10]. Topological insulators are a state of quantum matter [11][12][13], in which the surface is metallic, while the interior is insulating.…”