ISSP - The institute for Solid State Physics

Seminar
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第51回極限コヒーレント光科学セミナー:Ultrafast manipulation of magnetic structures probed by x-rays
標題: 第51回極限コヒーレント光科学セミナー:Ultrafast manipulation of magnetic structures probed by x-rays
日時: 2017年4月27日(木)  午前10:30~午前11:30
場所: SPring-8会議室(TV会議 物性研究所第一会議室)
講師: Dr. Urs Staub
所属: Swiss Light Source, Paul Scherrer Institut
要旨: Being able to manipulate magnetic structures in non-trivial ways such as by the application of a magnetic field, is interesting from fundamental point of view as well as from that of applications. Manipulating them on ultrafast time scales is even more exciting and challenging. Here I like to address the ultrafast magnetization dynamics of antiferromagnets, for which a microscopic understanding of the spin dynamics can be obtained by x-ray (resonant) diffraction using ultra-short x-ray pulses, today obtainable on X-ray-Free-Electron-Laser (XFEL) sources, such as the LCLS and SACLA. I will give examples on ultra-fast demagnetization on simple elemental Ho [1], on CuO, [2,3] which are in strong contrast to the results obtained on TbMnO3. [4] At the end I hope I will show you the potential to obtain ultrafast all optical switching in oxides by switching the magnetic structure and the ferroelectric polarization in a multiferroic. [5]

[1] L. Rettig et al., submitted
[2] S. L. Johnson et al., Phys. Rev. Lett. 108, 037203 (2012).
[3] U. Staub et al., Phys. Rev. B 89, 220401(R) (2014).
[4] J. Johnson et al., Phys. Rev. B in press (arXiv:1507.06628)
[5] T. Kubaka et al., Science 343,1333 (2014).
世話人: 和達 大樹 (内線:63400)
e-mail: wadati :at: issp.u-tokyo.ac.jp