Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 26: Thin films – coupling effects
MA 26.7: Vortrag
Mittwoch, 14. März 2018, 11:15–11:30, EB 301
TbCoFe/[Co/Ni/Pt] Exchange Coupled Heterostructure — •Michael Heigl, Ralph Wendler, Birgit Hebler, and Manfred Albrecht — Lehrstuhl für Experimentalphysik IV, Institut für Physik, Universität Augsburg, Germany
Heat-assisted magnetic recording (HAMR) is envisioned to increase the achievable storage density in future magnetic hard disk drives (HDD).
We present a candidate composite structure consisting of two exchange-coupled materials with different Curie temperatures. The heterostructure consists of an amorphous ferrimagnetic TbCoFe thin film as a storage layer coupled to a softer [Co/Ni/Pt] multilayer, acting as a write and read-out layer. TbCoFe is in comparison to classic HAMR materials like L10FePt [1] highly tunable by its composition, exhibits a smaller Curie temperature Tc, larger damping, and perpendicular magnetic anisotropy (PMA). Due to its small magnetization, the switching and read-out layer [Co/Ni/Pt] is required. [Co/Ni/Pt] multilayers were chosen because of their PMA, high Tc and large saturation magnetization.
We report on the magnetic properties of the separate layers as well as the coupled system for different compositions, thicknesses, and temperatures. Additionally, the structural stability of the amorphous TbCoFe films and the multilayers were investigated as function of annealing temperature.
References: [1] D. Weller et al., Phys. Status Solidi A210 (2013) 1245.