Inverse spin Hall effect in AuxTa1−x alloy films

Abstract

Gold (Au) and tantalum (Ta) metals are two important spin Hall materials with diametrically different crystalline structure, resistivity, and spin Hall angle. By vapor quenching, Au x Ta 1-x alloys of different crystalline and amorphous structures, stable and metastable, have been formed over the entire composition range. We have studied the inverse spin Hall voltage induced by the longitudinal spin Seebeck effect in Au x Ta 1-x alloy films. We have found that the inverse spin Hall voltage ΔV ISHE , resistivity ρ , and the spin Hall angle θ SH vary smoothly with composition. Both the spin Hall angle and the spin Hall conductivity exhibit a quasi-linear dependence on composition in the concentrated alloy regime, despite drastic differences in other properties. As corroborated by first-principle calculation, we show the contribution to spin Hall effect in Au x Ta 1-x alloy is dominated by the number of valence electrons. We also show that the magnetoresistance correlates with the spin Hall angle.

Dirac Nodal Line Metal for Topological Antiferromagnetic Spintronics

“…The calculated spin Hall conductivities of MnPd2 for ⃗ ∥ [001] and ⃗ ∥ [010] are given in Table 1. Overall, we find that the predicted magnitude of the spin Hall conductivity in MnPd2 is comparable to that in Ta [36,37], a widely used spin current source in spin-orbit torque devices [38], but somewhat smaller than that predicted for Pt [39 ]. Here, we focus on as a representative component of the spin Hall conductivity.…”

High-Throughput Techniques for Measuring the Spin Hall Effect

“…Materials with large SHA can be tailored by alloying, 17,32,33 , which decreases the conductivity and tunes the Fermi level close to maxima of the SHC. Also, phase transitions in binary or ternary phase diagrams can be exploited, or amorphous metals with low conductivity may be created by enforced mixing of immiscible elements.…”

Anomalous Hall-like transverse magnetoresistance in Au thin films on Y3Fe5O12

“…In this case, = SH int × holds, where the intrinsic spin Hall conductivity SH int depends on the band structure and is thus constant for a given metal [21]. By taking reported data on Au [39][40][41][42][43][45][46][47] In addition, we assume identical interface spin mixing conductivities in our reference Pt system and the Au system YIG/Pt ≡ YIG/Au , owing to the identical fabrication conditions, similar chemical qualities of the metals and similar Fermi energies and Sharvin conductivities of the metals [12]. Given these values, we can estimate the SMR magnitudes ∆ L,Au = (0.7 −0.4 +2.0 ) pΩm and ∆ T,Au = (7 −5 +25 ) fΩm for our YIG/Au sample.…”