| Author(s): |
Thomas J. Silva; Justin M. Shaw; Hans T. Nembach; Chan La-O-Vorakiat; Henry C. Kapteyn; Margaret M. Murnane; Mark Siemens; Stefan Mathias; Roman Adam; Patrik Grychtol; Martin Aeschlimann; Claus M. Schneider; |
| Title: |
Ultrafast Demagnetization Dynamics at the M-edges of Magnetic Elements Observed Using a Tabletop High-Harmonic Soft X-Ray Source |
| Published: |
December 15, 2009 |
| Abstract: |
We demonstrate that few-femtosecond soft x-ray pulses from high-order harmonic generation can probe femtosecond demagnetization dynamics. Using an experimental geometry where coherent high-harmonics are reflected from a magnetized Permalloy (Ni80Fe20) grating, large changes in the reflected intensity of up to 6 % at the M absorption edges of Fe and Ni are observed when the static magnetization is reversed. Ultrafast demagnetization by a femtosecond pump pulse can also be observed. The use of high harmonics for probing magnetic materials promises to combine nanometer spatial resolution, elemental specificity, and femtosecond-to-attosecond time resolution for the study of magnetism at fundamental limits. |
| Citation: |
IEEE Transactions on Magnetics |
| Volume: |
103 |
| Pages: |
4 pp. |
| Keywords: |
High-harmonic generation;magneto-optical Kerr effect;demagnetization;femtosecond magnetism |
| Research Areas: |
Physics, Condensed Matter Physics, Optical Physics |
| PDF version: |
 Click here to retrieve PDF version of paper (1MB) |
