Dynamic coercivity measurements of antiferromagnetically coupled magnetic media layers

Lohau, J.; Moser, A.; Margulies, D. T.; Fullerton, E. E.; Schabes, M. E.
April 2001
Applied Physics Letters;4/30/2001, Vol. 78 Issue 18, p2748
Academic Journal
We have performed dynamic coercivity measurements on a series of antiferromagnetically coupled (AFC) magnetic recording media utilizing a static write/read tester. The samples consist of two magnetic layers, which are antiferromagnetically coupled by a nonmagnetic layer. The investigated samples have a fixed top layer thickness and variable bottom layer thickness, such that the composite remanent magnetization thickness product (M[sub R]t[sub AFC]) varies over a large range, 0.17-0.30 memu/cm2. We find that the ratio between anisotropy energy and thermal energy (≡ stability ratio, C[sup -1]), and the intrinsic switching field H[sub 0] are, within the experimental error, constant for the series. This suggests that the top magnetic layer to first order determines the stability ratio of the AFC media and that M[sub R]t[sub AFC] can be varied over a large range without decreasing the stability or increasing the write field requirements. © 2001 American Institute of Physics.


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