Berlin 2018 – scientific programme

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.105: Poster

Tuesday, March 13, 2018, 09:30–13:00, Poster A

Spin pumping through Fe₃O₄ nano–oxide at the Fe/Pt interface — •Laura Mihalceanu, Sascha Keller, Andrés Conca, Burkard Hillebrands, and Evangelos Th. Papaioannou — TU Kaiserslautern, Erwin-Schrödinger Str. 56, 67663 Kaiserslautern

The spin current generation via spin pumping is a prominent method for the establishment of potential spin-current-generating devices. An indirect detection of this effect is provided by measuring the inverse spin Hall effect (ISHE) voltage. Various experiments have been performed in order to probe the interface properties of such bilayer systems by inserting different insulating interlayers at the FM–NM interface. Some examples are Py/MgO/Pt, Y₅Fe₅O₁₂/insulating barrier (Sr₂GaTaO₆,SrTiO₃, Sr₂CrNbO₆)/Pt structures and Fe/MgO/Pt. In our previous work on Fe/MgO/Pt we have shown the impact of an MgO tunneling barrier on the spin-pumping effect: spin currents are still inducing an ISHE voltage for very thin MgO tunneling barriers. Here, we reveal the impact of nanosized Fe₃O₄ particles at the interface of thin epitaxial Fe(12 nm)/Pt(10 nm) layers.

We show that Fe₃O₄ nanoparticles at the Fe/Pt interface significantly increase the fourfold anisotropy compared to a pure Fe/Al reference. In FMR and spin-pumping experiments a very broad linewidth of the FMR peak is revealed. The voltage generated by spin pumping is steadily detectable over a wide external magnetic field range ΔH.

In collaboration with T. Kehagias, Department of Physics, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece