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Anti-ferromagnetic coupling effects on energy barrier and reversal properties of recording media

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4 Author(s)
J. P. Wang ; Dept. of Media & Mater., Nat. Univ. of Singapore, Singapore ; Z. S. Shan ; S. N. Piramanayagam ; T. C. Chong

Analytical solutions for coercivity HCM1, HCM2 , effective (Mrt)eff, energy-barrier and effective thermal stability factor as a function of coupling constant J and other film parameters have been derived for two coupled ferromagnetic layers (FM-FM layer) with different magnetic properties for the first time. The condition for reduced effective (Mrt)eff is analyzed. These results are valuable for laminated antiferromagnetically coupled media design. This may open up a channel to raise thermal stability significantly while maintaining lower noise for longitudinal recording media

Published in:

IEEE Transactions on Magnetics  (Volume:37 ,  Issue: 4 )