Magnonics is a kind of science that studies magnetism and electricity, two kinds of energy. Magnonics looks at how magnets can affect electricity and how electricity can affect magnets. Scientists learn how magnets, electricity and particles interact with each other. They also learn how to control these interactions to create new kinds of things.
For example, magnonics scientists have used magnets and electricity to create tiny machines called nanomagnets. Nanomagnets can be used to make computer memory that is much faster and more efficient than traditional memory. Magnonics also helps scientists find better ways to make and use electrical energy, like with solar panels or batteries.
So, magnonics involves understanding how magnets and electricity work together, and then using that knowledge to create new things or make existing things better.