Altermagnetic platform for ultrafast coherent magnonics

Traditionally, magnetic solids are divided into two major classes – ferro and antiferromagnets. Recently, it was realized that this division is incomplete and needs to be complemented with the third class called altermagnets. Owing to their unique properties, combining antiferromagnetic order with phenomena typical for ferromagnets, altermagnets are believed to hold a great potential for spintronics and magnonics. Here we demonstrate a new functionality of altermagnets for magnonics operating at THz clock-rates.