Table 1.

Atomic magnetic moment, demagnetization time and Curie temperatures for Ni, Fe, Fe${}_{20}$Ni${}_{80}$ and Fe${}_{50}$Ni${}_{50}$.

	${\mu }_{\mathit{Ni}}$ (${\mu }_B$)	${\mu }_{\mathit{Fe}}$ (${\mu }_B$)	${\tau }_{\mathit{Ni}}$ (fs)	${\tau }_{\mathit{Fe}}$ (fs)	$T_C$ (K)
Ni	0.62	–	130 ± 40	–	629
Fe${}_{20}$Ni${}_{80}$	0.98 ± 0.04	2.31 ± 0.09	180 ± 40	300 ± 50	907
Fe${}_{50}$Ni${}_{50}$	1.18 ± 0.08	2.09 ± 0.08	80 ± 30	280 ± 50	804
Fe	–	2.2	–	222 ± 50	1044

Atomic magnetic moments are deduced from XMCD measurements at room temperature¹⁶. All demagnetization times, deduced from time resolved XMCD measurements at room temperature, are adapted from¹⁴. The Curie temperature for the pure elements are adapted from²⁰ and from¹⁴ for the alloys.