Berlin 2015 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 16: Focused Session on GHz Dielectrics: Materials for Mobile Communication I (DF with HL/MM)

DF 16.3: Talk

Thursday, March 19, 2015, 10:20–10:40, EB 407

Enhanced magnetooptic Kerr effect and magnetic properties of Ce:YIG thin films — •Andreas Kehlberger¹, Kornel Richter¹, Gerhard Jakob¹, Mehmet C. Onbasli², Gerald F. Dionne², Dong Hun Kim², Taichi Goto², Gerhard Götz³, Günter Reiss³, Timo Kuschel³, Caroline A. Ross², and Mathias Kläui¹ — ¹Universität Mainz, Mainz, Germany — ²Massachusetts Institute of Technology, Cambridge, USA — ³CSMD, Physics Department, Bielefeld University, Germany

Yttrium iron garnet (YIG) is a ferrimagnetic and electrically insulating garnet oxide that has low intrinsic magnetic damping. These properties make YIG a functional layer for spin-wave generation and filtering for telecommunication devices operating at microwave bands. The substitution of Y by Ce allows for an enhancement of the magnetooptic properties and to further influence the magnetic material properties. Our work presents an extensive study of high quality epitaxial Ce:YIG thin films and reveals that not only the magnetooptic properties but also the magnetic anisotropy can be tailored by the Ce substitution. For the first time we show that beside the Faraday rotation also the magnetooptic Kerr effect is enhanced compared to pure YIG, making a broader range of wavelength, including the fibreoptics band, accessible. We present growth methods for polycrystalline Ce:YIG films, which allow the development of integrated on-ship devices.[1,2] Our results show the suitability of Ce:YIG thin film for future magnetooptic and spintronic applications. [1] Lei Bi et al., Nature Photon. 5, 758-762 (2011) [2] Taichi Goto et al., J. Appl. Phys. 113, 17A939 (2013)