Berlin 2012 – scientific programme
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MA: Fachverband Magnetismus
MA 1: Joint Symposium "Tailoring Magnetism in L10-ordered Nanostructures: Perspectives for Magnetic Recording beyond 1 Tb/in2" (SYTM)
MA 1.5: Invited Talk
Monday, March 26, 2012, 11:30–12:00, H 0105
Optimization of FePt films for recording applications by micromagnetic modeling — •Josef Fidler1, Jehyun Lee1,2, Barbara Dymerska1, and Dieter Suess1 — 1TU Wien, Inst. für Festkörperphysik, Austria, — 2Seoul National University, Rep Korea.
The ordered FePt/L10 phase with high magnetocrystalline anisotropy is a candidate for achieving an areal magnetic storage density beyond 1 Tbit/inch2. The switching field of individual grains and bits has to be reduced due to the limitations of the write head. Exchange coupled composite and graded media have been suggested to reduce the nucleation/coercive field and keeping the high thermal stability[1]. The present study will discuss the combination of the ordered fct FePt/L10 phase and the disordered fcc FePt/A1 phase[2]. TEM investigations revealed a complex transformation from the disordered to the ordered phase and a rough interphase including spikes/tips depending on the deposition temperature and cooling rate. Numerical FE micromagnetic simulations of such phase graded media show that the roughness strongly influences the domain wall propagation during the magnetic reversal process from the soft to the hard phase. As a result, the Hc of the phase graded media was reduced to 13 kOe which is 16% of FePt L10 single phase (79 kOe)[3].
This work was supported by the EU FP7 project TERAMAGSTOR under Project No. FP7-ITC-2007-2-224001.
[1] D. Suess et al., Appl Phys Lett 87 (1), 012504 (2005). [2] V. Alexandrakis et al., J Appl Phys 109, 07B729 (2011). [3] J. Lee et al., Appl Phys Lett 98 (22), 222501 (2011).