Ferromagnetic Resonance of Y3Fe5O12 Nanowires

Abstract

In this letter, yttrium-iron-garnet (YIG) nanowires are synthesized in a porous silicon template via a sol-gel method; ferromagnetic resonance (FMR) and vibrating sample magnetometer (VSM) techniques are then utilized to investigate the magnetic properties of the YIG nanowires. Moreover, the effects of the annealing temperature on the saturation magnetization ${\text{4}\pi}M_{S}$ and the crystal phase of the ceramic wires are assessed. For annealing temperatures above the crystallization temperature (∼710 °C), ${\text{4}\pi}M_{S}$ is dramatically increased. Therefore, the ceramic wires are then routinely annealed at 800 °C for 2 hours. Based on the VSM measurements, the net saturation magnetization and the loading factor of the nanowires are found to be 85 G and 35% respectively. Using the FMR technique, a DC magnetic field is applied either perpendicular or parallel to the wire axis to obtain the anisotropy field from the FMR resonance conditions. It is confirmed that the anisotropy field is uniaxial and is equal to 398 Oe.