The Importance of Secondary Effects when Measuring Thin Film Anisotropy Fields (Hk)

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Abstract
It is shown that the measurement of Hk can he considerably disturbed if there are stray magnetic fields present, or if the film has dispersion of either Hk or easy axis. It is not practicable to correct measurements taken in stray magnetic fields, but the effects of dispersion can be largely overcome Before attempting to measure Hk the following requirements should be satisfied : (i) there must be no stray magnetic fields presen (ii) the output display system must include some form of integrator having a time constant longer than the rotation time of the thin film magnetization, and (iii) the pulsed magnetic field, Hp, should be large—preferably at least equal to the expcteed Hk.

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