The magnetocrystalline anisotropy energy has been determined for single crystal Y1.8 Er0.2Fe14B in the (001) and (100) planes between 5 K and 300 K using torque magnetometry techniques. The results are compared with a model based on crystal field theory. Excellent agreement was obtained between the model and experiment. Both experiment and model showed a first order spin reorientation between the  and an angle 70 degrees from the  in the (100) plane.
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Williams, C.M., Koon, N.C. & Das, B.N. High Field Torque Magnetometry Measurements on Y1.8Er0.2Fe14B. MRS Online Proceedings Library 96, 111 (1987). https://doi.org/10.1557/PROC-96-111