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D. Süss:
"Multilayer exchange spring media for magnetic recording";
Applied Physics Letters, 89 (2006), S. 113105-1 - 113105-3.

Multilayer exchange spring media for magnetic recording

D. Suess
Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, 1040 Vienna, Austria

The concept of exchange spring media is extended from two layers to N layers. The coercive field of the multilayer structure decreases with 1/N while the energy barrier is only determined by the magnetic properties of the hardest layer. A 25 nm thick trilayer has a 7.5 times smaller coercive field (1.4 T) as a single layer at the same thermal stability and for the same value of the magnetization. A continuous variation of the anisotropy in the recording media reduces the coercive field by a factor of 10 for a layer thickness of 25 nm.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC06588265

http://dx.doi.org/10.1063/1.2347894