Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 62: Magnetic Imaging (Experimental Techniques)

MA 62.8: Vortrag

Freitag, 24. März 2017, 11:30–11:45, HSZ 403

Giant enhancement of magneto-optical anisotropy in Co-films by ultrathin nonmagnetic overcoats — •Patricia Riego, Lorenzo Fallarino, Jon Ander Arregi, and Andreas Berger — CIC nanoGUNE, San Sebastian (Spain)

We explore the effect of ultrathin nonmagnetic (Pt) overcoat layers onto the magneto-optical (MO) properties of hcp Co by means of generalized magneto-optical ellipsometry (GME). It has been previously shown that hcp Co displays MO anisotropy, i.e., distinct MO coupling factors when the magnetization is aligned with different crystallographic axes of the material. In this work, we show that an ultrathin Pt overcoat enhances this MO anisotropy of Co up to 400%, as well as its Kerr rotation up to 250%, and that these effects depend very strongly on the exact overcoat thickness. The effect saturates when the Pt overcoat is 1.5 nm thick, indicating that the observed effect is interfacial in nature. Our modelling work demonstrates that such enhancements can be consistently explained by a strong and anisotropic modification of the MO response in the Co/Pt interface region.