Abstract
In $\mathrm{Co}∕\mathrm{Co}\mathrm{O}$ bilayers separation of the unidirectional anisotropy energy from crystalline anisotropy is accomplished with the temperature variation of the ac susceptibility from room temperature to $4.2\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. Measurements above the blocking temperature of the CoO layer give a clear measure of crystalline anisotropy in the Co. At $4.2\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ 85% of the total anisotropy is from ${K}_{\mathit{ud}}$ while the anisotropy of the Co layer only contributes about 15%. The small crystalline anisotropy energy does not account for the large difference between the exchange anisotropy determined by ac susceptibility and hysteresis loops.
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