Regensburg 2010 – wissenschaftliches Programm

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KR: Fachverband Kristallographie

KR 10: Poster: Multiferroics (with MA, DF, KR, DS)

KR 10.76: Poster

Dienstag, 23. März 2010, 10:45–13:45, Poster A

Magnetic anisotropy of Zn-substituted magnetite studied by ferromagnetic resonance — •Themistoklis Sidiropoulos, Deepak Venkateshvaran, Andreas Brandlmaier, Matthias Althammer, Matthias Opel, Rudolf Gross, and Sebastian T.B. Goennenwein — Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany

Ferromagnetic resonance (FMR) is a powerful technique for the investigation of the magnetic anisotropy in ferromagnetic thin films. Here, we use FMR to study the magnetic anisotropy of Zn_xFe_3−xO₄, a derivative of Fe₃O₄. We have grown coherently strained, epitaxial Zn_xFe_3−xO₄ thin films on MgO (001) substrates using pulsed laser deposition, monitored by an in situ RHEED system. Two sets of Zn_xFe_3−xO₄ films (with x = 0, 0.1, 0.33, 0.5 and 0.9) were deposited, one in pure Ar, the other in an Ar/O₂ (99:1) mixture. X-ray diffraction measurements indicate high crystallinity, as evident from a FWHM of 0.04^∘ in the rocking curves for the Zn_xFe_3−xO₄ (004) reflection. Previously, we demonstrated that Zn_xFe_3−xO₄ shows an appreciable tunability in both its magnetic and transport properties, depending on the Zn concentration and the growth atmosphere [1]. In this study, we discuss the evolution of the magnetic anisotropy with Zn concentration, growth atmosphere and temperature.

This work is supported by the DFG within SPP 1285, GO 944/3, and by the cluster of excellence Nanosystems Initiative Munich (NIM).

[1] D. Venkateshvaran et al., Phys. Rev. B 79, 134405 (2009).