Dresden 2011 – scientific programme

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DS: Fachverband Dünne Schichten

DS 32: Spins in Organic Materials III (Focused Session, jointly with MA -- Organisers: Salvan, Hess, Timm)

DS 32.4: Talk

Wednesday, March 16, 2011, 17:45–18:00, GER 37

Comparison of the magneto-optical response of different metal-phthalocyanines measured by MOKE — •Michael Fronk, Klaus Seidel, Dietrich R.T. Zahn, and Georgeta Salvan — Chemnitz University of Technology, Chemnitz, Germany

In recent years organic materials experience much attention because of their potential applications in spintronic devices predominantly due to their long spin life-times. This work focusses on the magneto-optical characterisation of paramagnetic phthalocyanines. While a part of this investigation (mainly on VOPc and CuPc) is already published [1] additional magneto-optical Kerr effect (MOKE) spectra of MnPc, FePc, and CoPc will be presented. The films in the typical thickness range between 30 nm and 100 nm were prepared by organic molecular beam deposition in high vacuum. The magneto-optical Voigt constant is obtained using optical model calculations. A fit of the Voigt data using an oscillator model was performed in order to gain more insight in the electronic origin of the features in the Voigt constant and subsequently in the MOKE spectra. For instance, the hybridisation of Co-3d states with the HOMO π-orbital of CoPc leads to additional features in the magneto-optical spectra compared to e.g. CuPc. This effect is much more pronounced in the magneto-optical spectra than in the dielectric function components that are commonly assessed by spectroscopic ellipsometry.

[1] M. Fronk et al., Phys. Rev. B 79 (2009) 235305