Abstract
Collective magnetic dipoles are written into sections of commercial magnetic recording tapes by application of high fields at angles θset with respect to the tape axis. The media is rotated 2000 times about the tape normal in a lower magnetic field Hm in the plane of the tape. The magnetization along the direction of Hm is measured in steps of Δθ=π/5. Harmonic analysis of the angular dependence of the magnetization is used to discover how the dipole term depends on cycle number n, Hm, the direction of rotation, and θset. The data are analyzed using μd(n)=μd(∞)+[μd(1)−μd(∞)]n−γ. This dipole disappears on rotation for an infinite number of cycles in fields Hm≳Hcrit. For Hm<Hcrit, μd(∞) depends on Hm much as Ms(T) depends on temperature. For Hm close to Hcrit, γ becomes as small as 0.1 for which 1010 cycles would be required to produce 90% of the change.
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