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La diffusion inélastique de neutrons polarisés sur l'instrument IN20 a permis, pour la première fois, de mettre directement en évidence des magnons de chiralités opposées dans un matériau dit "altermagnétique" ("altermagnet" en Anglais) et de démontrer que leur chiralité peut être inversée de manière réversible.

Though continuous down-scaling in microelectronics has enabled the industry to achieve phenomenal success, the trend is now approaching fundamental limits. Promising alternative technologies for next generation devices exploit not only the charge of the electron – as used in conventional microelectronics – but also the electron spin (spintronics) or spin waves (magnonics) in order to transmit, st…

Understanding, manipulating and exploiting the intriguing magnetic behaviour of a synthetic crystalline material called yttrium iron garnet (YIG) could open the door to the next, advanced generation of communication and information-processing devices. Experiments at the Institute Laue-Langevin (ILL) neutron beam facility in Grenoble, France have for the first time fully exposed the complex magnetic behaviour of YIG.