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MA: Fachverband Magnetismus
MA 15: Posters Magnetism IV
MA 15.23: Poster
Donnerstag, 30. September 2021, 13:30–16:30, P
Role of NiO in the nonlocal spin transport through thin NiO films on Y3Fe5O12 — Geert R. Hoogeboom1, Geert-Jan N. Sint Nicolaas1, Andreas Alexander2, Olga Kuschel2, Joachim Wollschläger2, Inga Ennen3, Bart J. van Wees1, and •Timo Kuschel3 — 1Zernike Institute for Advanced Materials, University of Groningen, The Netherlands — 2Osnabrück University, Germany — 3Bielefeld University, Germany
In spin-transport experiments with spin currents propagating through an antiferromagnetic (AFM) material, the AFM is mainly treated as a passive spin conductor not generating nor adding any spin current to the system. To study the role of AFMs in local and nonlocal spin-transport experiments, we have sent spin currents through NiO of various thicknesses placed on Y3Fe5O12. The spin currents are injected either electrically or by thermal gradients and measured at a wide range of temperatures and magnetic field strengths [1].
The transmissive role of NiO is reflected in the sign change of the local electrically injected spin transport and the reduction of all other signals by lowering the temperature. The thermally generated response, however, shows an additional upturn below 100 K that is unaffected by an increased NiO thickness. The temperature and magnetic field dependencies are similar to those for bulk NiO [2], indicating that NiO itself contributes to thermally induced spin currents.
[1] G. R. Hoogeboom et al., Phys. Rev. B 103, 144406 (2021)
[2] G. R. Hoogeboom et al., Phys. Rev. B 102, 214415 (2020)