Regensburg 2013 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 22: Poster II
DF 22.29: Poster
Freitag, 15. März 2013, 10:30–13:30, Poster D
Magnetization reversal of percolated ferrimagnetic Fe-Tb nanodot arrays — •Christian Schubert1, Phani Arekapudi1, Birgit Hebler1, Florin Radu2, Marcus Daniel1, and Manfred Albrecht1 — 1Institute of Physics, Chemnitz University of Technology, D-09107 Chemnitz, Germany — 2Department for Magnetization Dynamics, Helmholtz Zentrum Berlin, Germany
Amorphous ferrimagnetic rare earth-transition metal alloys with high perpendicular magnetic anisotropy are suitable in hard disk drives to overcome the superparamagnetic limit. In particular for thermally assisted bit patterned recording media [1] amorphous Fe-Tb is a promising functional layer providing good adjustability of anisotropy, Curie temperature, and saturation magnetization [2].
We present an investigation of structural and magnetic properties of percolated amorphous Fe-Tb nanodots produced by co-deposition on pre-patterned substrates with pillar diameters of 30 nm and a period of 60 nm. The magnetic films follow closely the morphology of the pre-pattern forming exchange coupled nanodots and trench material. Despite the exchange interaction the nanodots reveal a single domain magnetization state and reverse via a more coherent rotation process as deduced from in-field MFM and angular MOKE measurements. Contrary to this the reversal of the continuous trench material is dominated by domain wall motion and the coercive field is enhanced due to pinning effects caused by the nanodot array.
[1] Akagi et al., J. Magn. Magn. Mater. 324, 309 (2012)
[2] Mimura et al., IEEE Trans. Magn. 12, 779 (1976)