Abstract
Spin current possesses the capability to manipulate magnetization, as well as electric transport in metals and insulators, which brings potential to develop the multifunctional spintronic devices. Spin pumping is a widely used method to produce pure spin current, in which a processing ferromagnet (FM) pumps out a spin current into adjacent non-magnetic (NM) conductors. The injected spin current is subsequently converted into a transverse charge current, when large spin-orbit coupling exists in this conductor. The conversion efficiency is governed by spin mixing conductance and diffusion length of spin current in NM, in which spin mixing conductance is a characteristic of FM/NM interface and generally reflected from the enhanced Gilbert damping. Here, we have systematically studied the MgO and Al capping layers effect on damping in NiFe/Pt bilayers, by using coplanar waveguide ferromagnetic resonance and inverse spin Hall effect. The NiFe/Pt bilayers with Al capping layer show clearly magnetic proximity effect, meanwhile a significantly interfacial enhancement of damping, and then spin mixing conductance, has been found in the samples capped by MgO layers with potentially major consequences for applications.
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