Regensburg 2010 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 4: Magnetic Coupling Phenomena/ Exchange Bias

MA 4.7: Vortrag

Montag, 22. März 2010, 12:30–12:45, H22

Perpendicular FePt-based exchange-coupled composite media — •Denys Makarov¹, Jehyun Lee², Christoph Brombacher¹, Christian Schubert¹, Markus Fuger², Dieter Suess², Josef Fidler², and Manfred Albrecht¹ — ¹Institute of Physics, Chemnitz University of Technology, D-09107 Chemnitz, Germany — ²Institute of Solid State Physics, Vienna University of Technology, A-1040 Wien, Austria

To increase storage density in magnetic recording, FePt alloys in the L1₀ phase are under study as promising candidates for a recording layer [1]. However, due to the strong magnetic anisotropy, the magnetic field required to reverse the magnetization of the media may become higher than the field provided by a recording head. To solve this issue, the concept of exchange-coupled composite (ECC) media was suggested to reduce the switching field of a hard magnetic layer [2].

We fabricated ECC media which consisted of a hard FePtCu alloy film and a softer [Co/Pt]_N multilayer stack both revealing an out-of plane easy axis of magnetization. We demonstrated that the switching field could be efficiently reduced by increasing the thickness of the soft magnetic layer and by tuning the interlayer exchange coupling. These studies were supported by theoretical modeling revealing the relevant factors to reduce the switching field of the hard layer which are important for future media design.

[1] D. Makarov et al., J. Appl. Phys. 103 (2008) 053903.

[2] D. Suess et al., Appl. Phys. Lett. 87 (2005) 012054.