Abstract
We report the tri-axial grain-orientation effects under a modulated rotation magnetic field for (Y1−xErx)2Ba4Cu7Oy [(Y,Er)247]. The magnetic easy axis at room temperature was drastically changed around x∼0.1; however, the Er-doping levels for the conversion of magnetic easy axes from the c-axis to the ab-direction and from the a- to b-axes were quite different. Tri-axial single-ion magnetic anisotropy of Er3+ was roughly 10 times greater than tri-axial magnetic anisotropy generated by both the superconducting CuO2 plane and the blocking Cu–O chain layer. An appropriate choice of rare-earth (RE) ions in RE-based cuprate superconductors enables the reduction of the required magnetic field for the production of bulks and thick films based on the magnetic orientation technique.
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