Abstract
I THANK Dr. Bonyhard for his comments and agree that the net total torque caused by stray fields due to the film can never be zero. I was originally led to this erroneous conclusion in the search for a general theory independent of the nature of the coupling and by thinking that the dictum “action and reaction are equal and opposite” applied to any pair of torques as well as any pair of forces. However, the analysis of the increase in effective anisotropy field still holds: it is merely necessary to introduce the limitation that cos θ ≃ cos θ0 = 1, already used to integrate equation (4), when equating equations (1) and (4). So long as changes in cos θ are small over the range of the stray fields the balance of torques can still be used.
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EDWARDS, J. Apparent Anisotropy Field of Continuous Magnetic Films subjected to Inhomogeneous Drive Fields. Nature 204, 1185 (1964). https://doi.org/10.1038/2041185b0
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DOI: https://doi.org/10.1038/2041185b0
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