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Switching field time dependence of thin film media

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3 Author(s)
Mallary, Michael L. ; Quantum Corp. Technol. & Eng., Shrewsbury, MA, USA ; Torabi, A.F. ; Beauregard, R.

The dependence of remanent coercivity of thin film media on pulse duration has been measured for time intervals from 1.4 ns to 270 hr. The apparatus combines the field from a microconductor with that of a DC magnet to switch the media. The data from 53 μs to 270 hr fits well to Sharrock's Law with an exponent of 0.716. The data for times less than 8 ns indicate weak gyro-magnetic enhancement of the switching field. Micromagnetic simulation shows that this can be explained by either magnetostatic or exchange coupling between the grains

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Magnetics, IEEE Transactions on  (Volume:36 ,  Issue: 5 )