2023-11-12 07:00:14
A discovery on the magnetic properties of an exotic material could revolutionize tomorrow’s computing: manganese-doped germanium telluride (GeTe:Mn). This research, co-directed by EPFL, reveals that this multiferroic could reduce the energy necessary for tilting. , in the field of astronautics, is the progressive inclination of a vehicle…) from a computer bit to a millionth of current consumption.
Multiferroics, unique materials that combine magnetism (Magnetism is a physical phenomenon, through which forces are manifested…) and polarization (the polarization of electromagnetic waves; polarization due to moments…), are at the heart of this research (Scientific research refers primarily to all the actions undertaken with a view to…). Their properties open fascinating perspectives for advanced electronics and next-generation storage. GeTe:Mn, in particular, is the subject of studies for its potential to facilitate more efficient and economical technologies. .
GeTe:Mn stands out for its unique ferroelectric and magnetic properties. A novelty lies in its magnetic order, which differs from classic ferromagnets such as iron. In fact, GeTe:Mn acts as a ferrimagnet, where two magnets of different strengths are superimposed. This particularity provides greater control over the direction of magnetization, crucial for many technologies.
Scientists have developed a method to reverse the direction of magnetization with an efficiency six orders of magnitude greater than current technologies. Instead of a large pulsed current, a small alternating current is used, followed by a slight pulse at the appropriate moment, thus creating a stochastic resonance. This method causes a chain reaction in the material, similar to a solid-liquid, where a local modification leads to global changes.
According to Hugo Dil, this is because the system forms a correlated spin glass, where the local magnetic moments are in a glassy state. A change in a spin then propagates like a wave (A wave is the propagation of a disturbance producing a variation in its passage…) and influences the orientation (In the literal sense, the orientation designates or materializes the direction of the East (sunrise…) other magnetic moments.
This gain in switching efficiency is valuable for technological applications, considering ultra-power-efficient computers. However, the most exciting aspect for physicists remains the collective behavior of materials. Future experiments will seek to monitor and control the propagation of these excitations.
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