Magnetic Properties of Erbium Gallium Gallate under High Magnetic Field

摘要

A theoretical investigation on the magnetic properties of rare-earth Er~(3+) in Er_3Ga_5O_(12) was reported. The average magnetic moments(M) for applied magnetic field H parallel to the [001], [100], [110], [111] direction was studied based on the quantum theory. Temperature dependence of the magnetic properties is analyzed for H applied parallel to the [100] and [111] crystallographic directions. The magnetization decreases with increasing temperature, showing good agreement with thermal effect. A strong anisotropy of the magnetization is found under high magnetic field, but when the magnetic field is small, M and H are proportional.