Campus Units

Materials Science and Engineering, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

6-24-2016

Journal or Book Title

Physical Review Letters

Volume

116

Issue

25

First Page

257202

DOI

10.1103/PhysRevLett.116.257202

Abstract

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 ( E 1 , 2 p → 5 d ) or quadrupole ( E 2 , 2 p → 4 f ) transition allows us to selectively and independently study the spin dynamics of the itinerant 5 d and localized 4 f electronic subsystems via the suppression of the magnetic (2 1 3 − τ ) satellite peak. We find demagnetization time scales very similar to ferromagnetic 4 f 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 4 f − 5 d 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.

Comments

This article is published as Rettig, Laurenz, Christian Dornes, N. Thielemann-Kühn, N. Pontius, Hartmut Zabel, D. L. Schlagel, T. A. Lograsso et al. "Itinerant and localized magnetization dynamics in antiferromagnetic Ho." Physical Review Letters 116, no. 25 (2016): 257202. DOI: 10.1103/PhysRevLett.116.257202. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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