Multiscale modeling of ultrafast element-specific magnetization dynamics in FeNi ferromagnetic alloys
2015
Abstrakt
Excitation of magnetic materials by powerful femtosecond laser pulses leads to magnetization dynamics on the timescale of exchange interactions. The emerging dynamics can be probed using conventional magneto-optical methods when the ferromagnet is composed of only one magnetic element [1].
Many ferromagnets, such as permalloy (Py) or yttrium iron garnets (YIG), can exhibit rather complex magnetic structures and are composed of more than one element. For those cases, X-ray circular magnetic dichroism (XMCD) measurements allow to access the individual dynamics of the different elements in the alloy.