Abstract
We investigated spin Hall magnetoresistance in FeMn/Pt bilayers, which was found to be one order of magnitude larger than that of heavy metal and insulating ferromagnet or antiferromagnet bilayer systems, and comparable to that of NiFe/Pt bilayers. The spin Hall magnetoresistance shows a non-monotonic dependence on the thicknesses of both FeMn and Pt. The former can be accounted for by the thickness dependence of net magnetization in FeMn thin films, whereas the latter is mainly due to spin accumulation and diffusion in Pt. Through analysis of the Pt thickness dependence, the spin Hall angle, spin diffusion length of Pt and the real part of spin mixing conductance were determined to be 0.2, 1.1 nm, and 5.5 × 1014 Ω−1m−2, respectively. The results corroborate the spin orbit torque effect observed in this system recently.
Highlights
We investigated spin Hall magnetoresistance in FeMn/Pt bilayers, which was found to be one order of magnitude larger than that of heavy metal and insulating ferromagnet or antiferromagnet bilayer systems, and comparable to that of NiFe/Pt bilayers
The spin current is partially reflected back to the heavy metal (HM) layer when it reaches the FM/HM tion of spin cinutrerrefnatce(⇀−σ, w) iathndthme aregfnleectitzioatniocnoedfifrieccietinotndeotferthmeinFeMd b(⇀y−mt)h. eTahnegrleefbleecttwedeesnptihnecpuorrleanritzianturn generates an additional charge current through the inverse spin Hall effect (ISHE), leading to the appearance of spin Hall magnetoresistance (SMR): Rxx = R0 − ∆R(⇀−m ·⇀−σ)[2], where Rxx is the longitudinal resistance, R0 the isotropic longitudinal resistance, and ∆R the change in resistance induced by the SMR effect
In view of the above, we investigated both the Pt and FeMn thickness dependences of SMR in
Summary
We investigated spin Hall magnetoresistance in FeMn/Pt bilayers, which was found to be one order of magnitude larger than that of heavy metal and insulating ferromagnet or antiferromagnet bilayer systems, and comparable to that of NiFe/Pt bilayers. Thickness dependence of spin Hall magnetoresistance in FeMn/Pt bilayers
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