Biaxial magnetic orientation degrees of REBa₂Cu₃O_y under an oscillation type of modulated rotating magnetic field

Abstract

We clarified the dependence of the biaxial orientation degrees on the oscillation angle (θ) for YBa₂Cu₃O_y (Y123) and ErBa₂Cu₃O_y (Er123) powder samples, which are aligned under an oscillation (OS) type of modulated rotating magnetic field (MRF). Y123 and Er123 exhibit an opposite relationship on the magnetization axes and large difference in magnetic anisotropy. It was found that the biaxial orientation degrees depended not only on magnetic field strength of the OS type MRF but also on θ. In details, both static field (SF) and rotating field (RF) components of the magnetic alignment energy require approximately ∼10⁺⁵k_BT or higher. A respective increase and decrease in the biaxial orientation degrees were observed with the increase and decrease in the RF components. The above experimental results were found to be theoretically explainable. The findings in the present study possibly lead to the production of biaxially aligned RE123 (RE: rare earth elements) ceramics and thick films by appropriate distribution of the SF and RF components of magnetic alignment energy with taking the type of RE and viscosity of the slurry into account.