Magnetic and electronic properties of nanocrystalline Gd3Fe5O12 garnet

The Gd3Fe5O12 nanocrystalline Gadolinium Iron Garnet (GdIG) obtained from a sintered block was milled in a high energy ball mill. We measured the magnetization at 5 K under applied fields up to 12 T. We report here our study of approach to saturation magnetization. The results have been interpreted within the framework of random anisotropy model. From an analysis of the approach to saturation magnetization some fundamental parameters have been extracted. We have determined the anisotropy field Hr and the local magnetic anisotropy constant KL. In addition, first-principles spin-density functional calculations, using the Full potential Linear Augmented Plane Waves (FLAPW) method are performed to investigate electronic and magnetic structures. All computed parameters are discussed and compared to available experimental data.

Random anisotropy fields, random anisotropy constant, substantial interstitial magnetism as well as magnetic quadrupolar feature on oxygen are determined from magnetization, theoretical random magnetic anisotropy model and FLAPW calculations in nanocrystalline Gadolinium Iron Garnet (GdIG).Figure optionsDownload as PowerPoint slideHighlights
► Nanocrystalline Gadolinium Iron Garnet (GdIG) prepared by a high energy ball mill.
► Random magnetic anisotropy model developed for amorphous is used for Nanocrystalline GdIG.
► Random anisotropy fields and random anisotropy constant are determined.
► FLAPW calculations performed to investigate both magnetic and electronic structures.
► Substantial interstitial magnetism and magnetic quadrupolar feature on oxygen are revealed.