Extrinsic Spin Hall Effect Induced by Iridium Impurities in Copper

Abstract

We study the extrinsic spin Hall effect induced by Ir impurities in Cu by injecting a pure spin current into a CuIr wire from a lateral spin valve structure. While no spin Hall effect is observed without Ir impurity, the spin Hall resistivity of CuIr increases linearly with the impurity concentration. The spin Hall angle of CuIr, (2.1±0.6)% throughout the concentration range between 1% and 12%, is practically independent of temperature. These results represent a clear example of predominant skew scattering extrinsic contribution to the spin Hall effect in a nonmagnetic alloy.

Inverse spin Hall effect in a closed loop circuit

“…Therefore, as shown in Table I, we have referred to λ 1D M reported in our previous works [7,13] to obtain α 1D H ; α 1D H = −0.11 for Cu 99.5 Bi 0.5 and α 1D H = 0.014 for Pt. These results are consistent with our previous works [7,11,12,14].…”

“…In the present work, we prepared two types of samples, is the saturation field of magnetization of the Py wire, as already shown in our previous reports [7,11,12,14]. What is interesting to note is the amplitude of R ISHE , i.e., ∆R ISHE .…”

Spin-Swapping Transport and Torques in Ultrathin Magnetic Bilayers

“…A system that gathers these features is a magnetic bilayer involving a light metal doped with heavy elements, such as Cu(Bi), Cu(Ir), or Ag(Au). These materials display large extrinsic spin-orbit coupled scattering [36], and hence extrinsic spin swapping, together with ensuring the absence of interfacial spin-orbit coupling. Upon varying the thickness of the metallic layer from below to above the mean free path, a substantial modulation of the fieldlike torque is expected.…”

Low operational current spin Hall nano-oscillators based on NiFe/W bilayers

“…Many other heavy metals, such as W, 10,11 IrCu, 24,25 and CuBi, 26 have however been investigated, revealing that the so-called spin Hall angle (h SH ), which describes the charge current to spin current conversion efficiency, can exceed that of Pt. W is particularly interesting, as it has two different structural phases, called a and b, with an order of magnitude difference in resistivity (q a < q b ), and a much larger h SH in the b phase.…”