Enhanced magnon spin transport in NiFe${}_2$O${}_4$ thin films on a lattice-matched substrate

Abstract

We investigate magnon spin transport in epitaxial nickel ferrite (NiFe${}_2$O${}_4$, NFO) films grown on magnesium gallate spinel (MgGa${}_2$O${}_4$, MGO) substrates, which have a lattice mismatch with NFO as small as 0.78%, resulting in the reduction of antiphase boundary defects and thus in improved magnetic properties in the NFO films. In the nonlocal transport experiments, enhanced signals are observed for both electrically and thermally excited magnons, and the magnon relaxation length (${\lambda }_m$) of NFO is found to be around 2.5 $\mu$m at room temperature. Moreover, at both room and low temperatures, we present distinct features from the nonlocal spin Seebeck signals which arise from magnon polaron formation. Our results demonstrate excellent magnon transport properties (magnon spin conductivity, ${\lambda }_m$ and spin mixing conductance at the interface between Pt) of NFO films grown on a lattice-matched substrate that are comparable with those of yttrium iron garnet.

arXiv comment5 pages, 3 figures

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Cited by in corpus (13)

• Spin and spin current -- From fundamentals to recent progress
• Spin Seebeck Effect: Sensitive Probe for Elementary Excitation, Spin Correlation, Transport, Magnetic Order, and Domains in Solids
• Room temperature and low-field resonant enhancement of spin Seebeck effect in partially compensated magnets
• Magnon polarons in the spin Peltier effect
• Current direction anisotropy of the spin Hall magnetoresistance in nickel ferrite thin films with bulk-like magnetic properties
• All-electrical Magnon Transport Experiments in Magnetically Ordered Insulators
• Electric Field Switching of Magnon Spin Current in a Compensated Ferrimagnet
• Enhancement in Thermally Generated Spin Voltage at Pd/NiFe${}_2$O${}_4$ Interfaces by the Growth on Lattice-Matched Substrates
• Spin Seebeck effect in quantum magnet Pb2V3O9
• Magnetic field dependence of the nonlocal spin Seebeck effect in Pt/YIG/Pt systems at low temperatures
• Vectorial observation of the spin Seebeck effect in epitaxial NiFe${}_2$O${}_4$ thin films with various magnetic anisotropy contributions
• Composition-tunable magnon-polaron anomalies in spin Seebeck effects in epitaxial Bi${}_x$Y${}_{3-x}$Fe${}_5$O${}_{12}$ films
• Finite-frequency spin conductance of a ferro-/ferrimagnetic-insulator|normal-metal interface