Rapid Fabrication of MOD-YIG Films by using Microwave Kiln

Yttrium iron garnet (YIG) is a well-known material extensively utilized in magnonics, spintronics, and spin caloritronics. The development of YIG for practical applications has been the subject of considerable research. In this study, we present the fabrication of YIG films through the thermalization of chemically synthesized YIG using a microwave kiln. The YIG solution was prepared from yttrium and iron precursors in a stoichiometric ratio and subsequently coated onto silicon (Si) substrates. After annealing the coated YIG film with a specific microwave exposure duration, a crystallized YIG film was obtained, confirmed by grazing incidence X-ray diffraction (GI-XRD) analysis. The static magnetic properties were characterized using a vibration sample magnetometer (VSM), revealing comparable parameters, such as coercivity (HSUBC/SUB) = 33.9 ± 0.5 Oe and saturation magnetization (MSUBS/SUB) = 135.9 ± 1.1 emu/㎤ to those of YIG films annealed using conventional methods, including graphited-based and halogen lamp-based furnaces. Additionally, by using Pt as a spin detection layer, the spin thermoelectric efficiency was investigated via spin Seebeck effect measurements, indicating that YIG films annealed in a microwave kiln exhibit potential as a fabrication technique for YIG applications in spin caloritronics.