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Pure spin current transport has become the central point of the state-of-the-art spintronics. While most spin current phenomena have been extensively explored, aspects of the pure spin current injected into ferromagnetic metals are far from completely understood. The reports on a fundamental problem, i.e. the spin relaxation asymmetry with spin current polarization collinear or transverse to the magnetization of ferromagnetic metals, are quite controversial. By employing a Y 3 Fe 5 O 12  (YIG)/Cu/Ni 80 Fe 20  (Py)/Ir 25 Mn 75  (IrMn) spin valve heterostructure with the thermal inverse spin Hall effect (ISHE) of a Py well separated from other thermoelectric transport and thermal Hall effects, we find that the ISHE signal amplitude in 10 nm Py increases by 80% when changing the relative orientation of the YIG and Py magnetization from orthogonal (⊥) to collinear (||). Moreover, the spin-diffusion length  λ  sf  and effective spin Hall angle    $$\theta _{{\mathrm{SH}}}^{{\mathrm{eff}}}$$  θ SH eff of Py are also spin orientation dependent and vary from    $$\lambda _{{\mathrm{sf}}}^ \bot$$  λ sf ⊥  = 1.0 ± 0.1 nm to    $$\lambda _{{\mathrm{sf}}}^\parallel$$  λ sf ∥  = 2.8 ± 0.5 nm with    $$\theta _{{\mathrm{SH}}}^{{\mathrm{eff}}}\left( \bot \right)/\theta _{{\mathrm{SH}}}^{{\mathrm{eff}}}\left( \parallel \right)$$  θ SH eff ⊥ ∕ θ SH eff ∥  = 1.5, respectively. Our results demonstrate magnetization orientation-dependent spin relaxation and spin injection efficiency of a pure spin current, revealing that exchange interactions in ferromagnetic metals strongly affect the transport of the pure spin current.

Strong spin orientation-dependent spin current diffusion and inverse spin Hall effect in a ferromagnetic metal