| Literature DB >> 22400779 |
S L Johnson1, R A de Souza, U Staub, P Beaud, E Möhr-Vorobeva, G Ingold, A Caviezel, V Scagnoli, W F Schlotter, J J Turner, O Krupin, W-S Lee, Y-D Chuang, L Patthey, R G Moore, D Lu, M Yi, P S Kirchmann, M Trigo, P Denes, D Doering, Z Hussain, Z-X Shen, D Prabhakaran, A T Boothroyd.
Abstract
We report on the ultrafast dynamics of magnetic order in a single crystal of CuO at a temperature of 207 K in response to strong optical excitation using femtosecond resonant x-ray diffraction. In the experiment, a femtosecond laser pulse induces a sudden, nonequilibrium increase in magnetic disorder. After a short delay ranging from 400 fs to 2 ps, we observe changes in the relative intensity of the magnetic ordering diffraction peaks that indicate a shift from a collinear commensurate phase to a spiral incommensurate phase. These results indicate that the ultimate speed for this antiferromagnetic reorientation transition in CuO is limited by the long-wavelength magnetic excitation connecting the two phases.Year: 2012 PMID： 22400779 DOI： 10.1103/PhysRevLett.108.037203
Source DB: PubMed Journal: Phys Rev Lett ISSN： 0031-9007 Impact factor: 9.161