Berlin 2012 – scientific programme

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MA: Fachverband Magnetismus

MA 47: Micro- and Nanostructured Magnetic Materials II

MA 47.4: Talk

Thursday, March 29, 2012, 18:00–18:15, EB 202

Magnetization reversal processes in Fe_1−xTb_x nanodot arrays — •C. Schubert¹, P. K. Arekapudi¹, B. Hebler¹, H. Schletter¹, A. Liebig¹, F. Radu², and M. Albrecht¹ — ¹Institute of Physics, Chemnitz University of Technology, 09126 Chemnitz, Germany — ²Department Magnetization Dynamics, Helmholtz Zentrum Berlin, 12489 Berlin, Germany

For spintronic and storage applications rare earth-transition metal alloy films like amorphous ferrimagnetic Fe_1−xTb_x are suitable materials owing to their high perpendicular magnetic anisotropy (7 - 10 Merg/cm³) and low net magnetization (<300 emu/cm³) [1]. In particular, arrays of Fe-Tb nanodots can exhibit manifold magnetic properties interesting for future sensor applications.

We present an investigation of the structural properties and the magnetization reversal process of amorphous Fe_1−xTb_x nanodots with a diameter of 30 nm, a height of 20 nm, and a period of 60 nm in the composition range from x = 0.19 to 0.23. All depositions were realized by magnetron (co-)sputtering on pre-patterned SiO₂/Si(100) substrates, which were fabricated by nano imprint lithography. The magnetization reversal of the nanodots occurs largely via coherent rotation as observed from angular dependent MOKE measurements in a polar geometry and by MFM imaging which shows single domain states.

[1] Y. Mimura et al., J. Appl. Phys. 49, 3 (1978)