Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: Poster 1
MA 19.17: Poster
Dienstag, 6. September 2022, 17:30–20:00, P2
Systematic variation of NiFe2O4 thin film lattice parameters by post-annealing in oxygen atmosphere — •Julian Straßburger, Jan Biedinger, Oliver Ritter, Tobias Peters, Luca Marnitz, Karsten Rott, and Timo Kuschel — Center for Spineletronic Materials and Devices, Bielefeld University, Germany
Nickel ferrite (NFO) is a ferrimagnetic insulator and a promising material for spin caloric applications [1,2,3]. In this study, twin samples of NFO thin films (45nm thick) were prepared on MgAl2O4 substrates by reactive DC magnetron sputter deposition. The samples were in-situ post-annealed in oxygen atmosphere at different temperatures. After cooling down to room temperature, one sample of each pair was capped by 3nm of Pt for future spin Seebeck effect studies. It was shown by x-ray diffraction analysis that the in-plane and out-of-plane lattice constants change systematically by varying the post-annealing temperature. A possible change of oxygen content in the samples was investigated by determining the unit cell volume and Possion’s ratio from the lattice parameters as well as the optical band gap energy from optical spectroscopy data [4,5]. In a next step, the influence of systematically modified lattice parameters on thermally induced spin transport will be investigated.
[1] D. Meier et al., Phys. Rev. B 87, 054421 (2013)
[2] C. Klewe et al., J. Appl. Phys. 115, 123903 (2014)
[3] D. Meier et al., Nat. Commun. 6, 8211 (2015)
[4] P. Bougiatioti et al., Phys. Rev. Lett. 119, 227205 (2017)
[5] P. Bougiatioti et al., J. Appl. Phys. 122, 225101 (2017)