Structure and magnetism of novel high-entropy rare-earth iron garnet ceramics

Abstract

A new type of high-entropy rare-earth iron garnet ceramic structure (Gd0.2Dy0.2Er0.2Y0.2RE0.2)3Fe5O12 (RE = Sm, Eu, Tm, Yb) powders were synthesised using a solid-phase method. In addition, the microstructure and magnetic properties of the (Gd0.2Dy0.2Er0.2Y0.2RE0.2)3Fe5O12 (RE = Sm, Eu, Tm, Yb) powders were evaluated. The (Gd0.2Dy0.2Er0.2Y0.2RE0.2)3Fe5O12 (RE = Sm, Eu, Tm, Yb) ceramics presented garnet crystal structure (Ia-3d), and their lattice parameters ranged between 12.3921 and 12.3644 Å. Moreover, the saturation magnetisation (Ms) and coercivity (Hc) of the ceramics ranged between 12.29 and 13.27 emu/g and between 18.46 and 19.87 Oe, respectively. The Ms and Hc values of the samples were comparable, indicating that magnetism of high-entropy rare-earth iron garnet ceramic can be fine-tuned by customising their composition. The magnetic properties of high-entropy rare-earth iron garnet ceramics have not yet been elucidated; however, previous studies have demonstrated that high-entropy rare-earth iron garnet ceramics present unique magnetism.