Magnesium (Mg) is a lightweight and low-cost metal that has good thermal conductivity and electrical conductivity, making it a potential candidate for use as a single crystal substrate in various applications. However, Mg is highly reactive and has a tendency to corrode easily, which limits its use as a substrate material in many applications. To overcome this issue, surface treatments such as anodization and coating with protective films can be applied to enhance its corrosion resistance. Despite these challenges, Mg single crystal substrates are used in certain applications due to their good thermal conductivity, light weight, and low cost compared to other substrate materials.