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Thermally Assisted All-Optical Helicity Dependent Magnetic Switching in Amorphous Fe100–xTbx Alloy Films



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All-optical switching (AOS) in ferrimagnetic Fe100-xTbx alloys is presented. AOS is witnessed below, above, and in samples without a magnetic compensation point. It is found that AOS is associated with laser heating up to the Curie temperature and intimately linked to a low remanent sample magnetization. Above a threshold magnetization of 220 emu/cc helicity dependent AOS is replaced by pure thermal demagnetization.