Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 31: Magnonics I
MA 31.6: Vortrag
Mittwoch, 14. März 2018, 16:30–16:45, H 0110
Magnonic crystals with spatial modulation of magnetic anisotropy — •Lukáš Flajšman1, Ondřej Wojewoda2, Viola Křižáková2, Jonas Gloss3, Igor Turčan1, Michael Schmid3, Michal Urbánek1,2, and Peter Varga1,3 — 1CEITEC BUT, Brno, Czech Republic — 2IPE, BUT, Brno, Czech Republic — 3TU Wien, Wien, Austria
Artificially patterned periodic magnetic structures - magnonic crystals - are prospective materials for controlling and manipulating spin waves. Most common types of magnonic crystals are based on periodic alternation of saturation magnetization or material thickness. We investigate the possibility of inducing the frequency band-gap by periodic modulation of direction of uniaxial anisotropy. In our approach in order to fabricate structures with periodic spatial modulation of uniaxial anisotropy we use a metastable paramagnetic fcc Fe thin films on Cu(100) substrate, which can be locally transformed by focused ion beam (FIB) to ferromagnetic bcc Fe phase [1]. The transformed areas have highly ordered crystallographic structure which can be to some extend controlled by proper selection of the FIB irradiation procedure. This permits the control of the magnetic anisotropy (type and direction) of the transformed areas. us to prepare magnonic crystals with modulation in direction of uniaxial anisotropy. We further investigate the band-structure of magnonic crystals with modulated uniaxial magnetic anisotropy by micromagnetic simulations.
[1] J. Gloss, S. Shah Zaman, J. Jonner, Z. Novotny, M. Schmid, P. Varga, M. Urbánek, Appl. Phys. Lett. 103 (2013) 262405