Journal
APPLIED PHYSICS LETTERS
Volume 89, Issue 11, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2347894
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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. (c) 2006 American Institute of Physics.
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