Science, Space and Technology News 2024
Researchers have developed a non-thermal method to alter magnetization using XUV radiation, utilizing the inverse Faraday effect in an iron-gadolinium alloy. This approach enables significant magnetization changes without the usual thermal effects, promising enhancements in ultrafast magnetism technologies. Credit: SciTechDaily.com
Scientists from the Max Born Institute , in collaboration with an international team of researchers, have now demonstrated an effective non-thermal approach of generating large magnetization changes. By exposing a ferrimagnetic iron-gadoliniumto circularly polarized pulses of extreme ultraviolet radiation, they could reveal a particularly strong magnetic response depending on the handedness of the incoming XUV light burst .
Figure 1: Magnetization dynamics induced by femtosecond XUV pulses tuned to the Fe M3,2 resonance of FeGd with variable polarization for two different excitation fluences. The helicity-dependent effect ΔM corresponds to the IFE-induced difference of the demagnetization amplitudes for σ±-excitation. Credit: MBI / M. HenneckeAn international team of researchers, led by scientists from MBI, has now studied an entirely different, non-thermal pathway of manipulating magnetism by light.
Figure 2: Comparison of the largest experimentally observed helicity-dependent effects ΔMexp to the calculated IFE response ΔIFE as a function of XUV photon energy. ΔMsim shows the expected influence of the XMCD on the magnetization dynamics, which is too small to explain the observed effects. Credit: MBI / M.
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