A magnon is a quasiparticle, a collective excitation of the electrons’ spin structure in a crystal lattice. In the equivalent wave picture of quantum mechanics, a magnon can be viewed as a quantized spin wave. Magnons carry a fixed amount of energy and lattice momentum, and are spin-1, indicating they obey boson behavior.
参考资料：
https://en.wikipedia.org/wiki/Magnon
https://zh.wikipedia.org/wiki/磁振子
https://baike.baidu.com/item/磁振子/5947667