Nonlocal magnon spin transport in NiFe${}_2$O${}_4$ thin films

Abstract

We report magnon spin transport in nickel ferrite (NiFe${}_2$O${}_4$, NFO)/ platinum (Pt) bilayer systems at room temperature. A nonlocal geometry is employed, where the magnons are excited by the spin Hall effect or by the Joule heating induced spin Seebeck effect at the Pt injector, and detected at a certain distance away by the inverse spin Hall effect at the Pt detector. The dependence of the nonlocal magnon spin signals as a function of the magnetic field is closely related to the NFO magnetization behavior. In contrast, we observe that the magnetoresistance measured locally at the Pt injector does not show a clear relation with the average NFO magnetization. We estimate the magnon spin relaxation length to be 3.1 $\pm$ 0.2 $\mu$m in the investigated NFO samples.

6 pages, 4 figures

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• Criteria for accurate determination of the magnon relaxation length from the nonlocal spin Seebeck effect
• Enhanced magnon spin transport in NiFe${}_2$O${}_4$ thin films on a lattice-matched substrate
• Antiferromagnetic magnon pseudospin: Dynamics and diffusive transport
• Electrical transport and optical band gap of NiFe${}_{\text{2}}$O${}_{\text{x}}$ thin films
• Differences in the magnon diffusion length for electrically and thermally driven magnon currents in Y${}_3$Fe${}_5$O${}_{12}$
• All-electrical Magnon Transport Experiments in Magnetically Ordered Insulators
• Exploiting Coherence in Nonlinear Spin-Superfluid Transport
• Enhancement in Thermally Generated Spin Voltage at Pd/NiFe${}_2$O${}_4$ Interfaces by the Growth on Lattice-Matched Substrates
• Vectorial observation of the spin Seebeck effect in epitaxial NiFe${}_2$O${}_4$ thin films with various magnetic anisotropy contributions
• Role of NiO in the nonlocal spin transport through thin NiO films on Y${}_3$Fe${}_5$O${}_{12}$
• Nonlocal magnon spin transport in yttrium iron garnet with tantalum and platinum spin injection/detection electrodes
• Microwave control of thermal magnon spin transport
• Absence of evidence of spin transport through amorphous Y${}_3$Fe${}_5$O${}_{12}$
• A puzzling insensitivity of magnon spin diffusion to the presence of 180${}^{\circ }$ domain walls in a ferrimagnetic insulator
• Magnon currents excited by the spin Seebeck effect in ferromagnetic EuS thin films
• Magnonic spin Joule heating and rectification effects
• Electrical manipulation of spin pumping signal through nonlocal thermal magnon transport
• Anisotropic Magnon Spin Transport in Ultra-thin Spinel Ferrite Thin Films -- Evidence for Anisotropy in Exchange Stiffness
• Influence of low-energy magnons on magnon Hanle experiments in easy-plane antiferromagnets