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MA: Fachverband Magnetismus
MA 30: Magnetic Materials II
MA 30.8: Vortrag
Mittwoch, 18. März 2015, 16:45–17:00, H 0112
Magnetic anisotropy manipulation in Ni nanostructures fabricated on VO2 (100) thin films imaged by time-resolved high resolution x-ray microscopy across the phase transition — •Simone Finizio1, Mehran V. Khanjani1, Andrea Fantini1,2, Michael Foerster3, Simone Altendorf2,4, Donata Passarello2, Lucia Aballe3, Stuart S.P. Parkin2, and Mathias Kläui1 — 1Institut für Physik, Universität Mainz, Mainz, Germany — 2IBM Almaden Research Center, San Jose, CA, USA — 3ALBA Synchrotron Light Source, Cerdanyola del Valles, Spain — 4Max Planck Institute for Microstructure Physics, Halle, Germany
Due to the possibility to generate strain variations on ultra-short timescales, the metal-insulator-transition (MIT) in VO2 is of particular interest for the study of the dynamics involved in the magnetostrictive coupling. In particular, strain can be manipulated in conventional piezoelectric materials only on slow timescales (<GHz), while here fast strain variations result from the MIT, which occurs on the ps timescale.
In this contribution, we will present x-ray magnetic microscopy imaging of Ni nanostructures fabricated on VO2 (100) thin films deposited by pulsed-laser-deposition on TiO2 (100) substrates upon crossing the MIT of the VO2. Due to strain change when crossing the MIT, strong changes in the magnetic anisotropy of the Ni nanostructures were observed, which changed from a low temperature uniaxial-anisotropy dominated state to a high temperature shape-anisotropy dominated state.