The spin Seebeck effect is able to convert a temperature gradient into a spin current. Many potential applications exist for the field of spintronics, which use these spin currents, instead of the conventional charge currents in normal electronics. These devices can be incredibly low power, but much work is required to understand the generation and propagation of spin currents through the materials. Yttrium iron garnet with thin platinum on top is a model system for investigating these issues, and recently it has been found that inserting a thin layer of antiferromagnetic nickel oxide in the middle of them results in strange behavior with temperature. This experiment aims to probe the magnetic effect of the nickel oxide layer.