Itinerant and Localized Magnetization Dynamics in Antiferromagnetic Ho

作者：Rettig L; Dornes C; Thielemann Kuehn N; Pontius N; Zabel H; Schlagel D L; Lograsso T A; Chollet M; Robert A; Sikorski M; Song S; Glownia J M; Schuessler Langeheine C; Johnson S L; Staub U

来源：Physical Review Letters, 2016, 116(25): 257202.

DOI：10.1103/PhysRevLett.116.257202

Using femtosecond time-resolved resonant magnetic x-ray diffraction at the Ho L-3 absorption edge, we investigate the demagnetization dynamics in antiferromagnetically ordered metallic Ho after femtosecond optical excitation. Tuning the x-ray energy to the electric dipole (E1, 2p -> 5d) or quadrupole (E2, 2p -> 4f) transition allows us to selectively and independently study the spin dynamics of the itinerant 5d and localized 4f electronic subsystems via the suppression of the magnetic (2 1 3-tau) satellite peak. We find demagnetization time scales very similar to ferromagnetic 4f systems, suggesting that the loss of magnetic order occurs via a similar spin-flip process in both cases. The simultaneous demagnetization of both subsystems demonstrates strong intra-atomic 4f-5d exchange coupling. In addition, an ultrafast lattice contraction due to the release of magneto-striction leads to a transient shift of the magnetic satellite peak.

• 出版日期2016-6-21