Scientists have for the first time observed new three-dimensional magnetic structures, using femtosecond laser light pulses. These ultrashort pulses, lasting only a few billionths of a second, have made it possible to manipulate magnetism at the nanoscale, inducing three-dimensional states that had not been detected until now. This breakthrough opens the door to a deeper understanding of magnetic phenomena in materials and their potential application in future technologies.

The ability to control magnetism with light at such small scales represents a significant milestone. Traditionally, the manipulation of magnetic states has been achieved using external magnetic fields or electrical currents. However, the use of laser light offers a contactless tool with unprecedented temporal and spatial precision, allowing for the exploration of ultrafast magnetic dynamics and complex spatial configurations.

The method employed is based on using light as a "remote control" to induce and observe these three-dimensional magnetic states. The interaction of femtosecond laser pulses with the material causes ultrafast changes in its electronic configuration and, consequently, in its magnetic properties. This technique not only allows for the creation of these structures but also their in situ study, providing valuable information about their formation and stability. This discovery has implications for the development of denser and faster data storage devices, as well as for spintronics and quantum computing, where precise control of magnetic states is fundamental.