Ferromagnetic resonance

Ferromagnetic resonance is like a game of catch. Imagine you have a magnet (the ferromagnetic material) and you move it around quickly, like throwing a baseball back and forth to someone. When you throw the magnet, it gives off signals of energy called electromagnetic waves. As the magnet moves, these waves bounce off of anything nearby, like walls or other magnets. When the waves collide with another magnet in the same spot, they bounce off, like when you throw a ball and it bounces off another person. This bouncing off of waves is called ferromagnetic resonance, and it can be used to measure the properties of different materials, like the strength of the magnet or how dense the material is.