Spintronic devices in which pure spin currents propagate without dissipation are viewed as the future of low power computing. Mechanisms such as spin-polarized current injection, the spin Hall effect, and precessional spin pumping have been used to generate spin currents, while spin current may be detected by the inverse spin Hall effect or via the spin transfer torque exerted upon a ferromagnet.
We have demonstrated that X-ray detected ferromagnetic resonance (XFMR) provides unique capabilities to probe the generation and propagation of spin currents in multilayered spintronics structures directly. Taking advantage of magnetic contrast and element specificity of x-ray spectroscopy we showed that in a Ni81Fe19/Cu/Cu75Mn25/Cu/Co multilayer, spin current excited in the Ni81Fe19 layer propagates across the Cu spacer layer and excites a precession in the Co layer. Utilizing the sensitivity of X ray magnetic linear dichroism (XMLD) to antiferromagnetic order, will allows expanding the capabilities of X-ray detected magnetic resonance to antiferromagnetic systems. We will discuss our recent efforts to probe the propagation of spin currents in ferrimagnetic materials as well as ferromagnetic/antiferromagnetic multilayer structures.
Speaker: Elke Arenholz, Lawrence Berkeley National Labs
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