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MA: Fachverband Magnetismus

MA 15: Magnetism Poster A

MA 15.80: Poster

Dienstag, 2. April 2019, 10:00–13:00, Poster E

Strain-induced perpendicular magnetic anisotropy and Gilbert damping in Tm3Fe5O12 thin films — •Oana Ciubotariu¹, Anna Semisalova², Killian Lenz², and Manfred Albrecht¹ — ¹Institute of Physics, University of Augsburg, Universitätsstraße 1, 86135 Augsburg, Germany — ²Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, BautznerLandstr. 400, 01328 Dresden, Germany

In the attempt of implementing iron garnets with perpendicular magnetic anisotropy (PMA) in spintronics, the attention turned towards strain-grown iron garnets. One candidate is Tm3Fe5O12 (TmIG) which shows strain-induced PMA when grown under tensile strain [1]. Possible substrate choices are GGG(111) and substituted-GGG(111) substrates, where the latter generated a higher in-plane tensile strain for the growth of TmIG. TmIG films with thicknesses between 20 and 300 nm were grown by PLD on sGGG(111) substrates. XRD measurements showed that films thinner than 200 nm exhibit in-plane tensile strain, thus, they meet the requirement for PMA. As expected, these films show PMA due to strain-induced magneto-elastic anisotropy. However, with increasing film thickness a relaxation of the unit cell towards its bulk structure is observed resulting in a rotation of the magnetic easy axis from out of the sample plane towards the sample plane. The Gilbert damping parameter extracted from FMR measurements is in the range of 0.03 independent of the film thickness.

[1] Kubota, M. et al. App. Phys. Exp. 5, 103002 (2012)