Regensburg 2019 – scientific programme
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MA: Fachverband Magnetismus
MA 37: Focus Session: Insulator Spintronics
MA 37.6: Talk
Wednesday, April 3, 2019, 18:15–18:30, H38
Enhanced magnon spin transport in NiFe2O4 thin films on the lattice-matched substrate MgGa2O4 — Juan Shan1, Amit V. Singh2, Lei Liang1, Ludo C. Cornelissen1, Zbigniew Galazka3, Arunava Gupta2, Bart J. van Wees1, and •Timo Kuschel1,4 — 1Zernike Institute for Advanced Materials, University of Groningen, The Netherlands — 2MINT Center, University of Alabama, USA — 3Leibniz-Institut für Kristallzüchtung, Berlin, Germany — 4Center for Spinelectronic Materials and Devices, Bielefeld University, Germany
We report on enhanced magnon spin transport properties in epitaxial NiFe2O4 (NFO) films grown on MgGa2O4 substrates [1] compared to NFO films deposited on standard MgAl2O4 [2]. The reduction of the lattice mismatch from 3.2% to 0.8% decreases the number of antiphase boundary defects in the NFO films and, thus, improves structural and magnetic properties. Further, spin transport is strongly improved as we have studied by nonlocal magnon spin transport experiments with Pt injector and detector strips. While the magnon spin diffusion length in the NFO films of around 3 µm is not changed drastically, the nonlocal spin transport signal is enhanced by two orders of magnitude. This increase is detectable for both electrically and thermally excited magnons. In addition, we observe spin transport signals in NFO that point to magnetoelastic coupling identified as magnon polarons [1]. These findings make lattice-matched NFO being an important alternative to Y3Fe5O12 (YIG) in terms of spin transport properties.
[1] J. Shan et al., Appl. Phys. Lett. 113, 162403 (2018)
[2] J. Shan et al., Appl. Phys. Lett. 110, 132406 (2017)