Experimental data of the intrinsic perpendicular magnetic anisotropy energy constantKuare presented for amorphous rare earth‐transition metal (RE‐TM) Tbx(FeCo)1−xand multilayered Co/Pt thin film samples. These data were independently measured using five techniques based on torque magnetometry, the extraordinary Hall effect, and the magneto‐optic Kerr effect. In the Hall effect measurement, the external field was applied to the sample in three different ways: fixed at 45° from the film normal; rotating around the sample; and fixed along the in‐plane direction. The results obtained with these techniques agree with each other for the Co/Pt samples. However, we do find systematic differences in the measuredKufor the Tbx(FeCo)1−xsamples. For example,Kugiven by the Hall effect and Kerr effect is always larger (by up to a factor of 3) than that given by torque technique. Another interesting fact is thatKugiven by the Hall effect technique drops asxapproaches the compensation pointxcin the TM‐dominant case, but increases asxapproachesxcin the RE‐dominant case. These experimental results are explained by taking into account the canting between RE and TM subnetworks.