Energy coupled to matter for magnetic alignment of rare earth–doped alumina

ABSTRACT

Energy coupled to matter (ECM) concepts such as magnetic field–assisted processing were used to align rare earth–doped alumina ceramics in the presence of applied fields. The addition of gadolinium and ytterbium dopants to alumina increased the magnetic susceptibility anisotropies, and induced magnetic torques that led to significant alignment of ceramic particles under the application of magnetic fields as low as 1.8 T. In comparison, undoped alumina materials showed minimal alignment under applied field strengths as high as 9 T. Density function theory modeling indicated that the specific dopant type dictated changes in the magnetic properties of different rare earth–doped alumina systems by directly affecting the magnetic moment localization and magnetocrystalline anisotropy.

KEYWORDS:

• Alignment
• alumina
• coupled
• density
• dopants
• energy
• field
• magnetic
• matter
• processing
• susceptibility
• texturing