HFI/NQI 2010

Advances in a Bulk and Surface properties Studies by using Mossbauer spectroscopy

Not scheduled

1m

500/1-001 - Main Auditorium (CERN)

POSTER Magnetism and Magnetic materials - Bulk and thin layers

Speaker

Prof. Alexander Kamzin (Ioffe PhysicalTechnical Institute TAS, St-Petersburg, 194021 Russia)

Description

Advances in a Bulk and Surface properties Studies by using Mossbauer spectroscopy FA.S.Kamzin Ioffe PhysicalTechnical Institute TAS, St-Petersburg, 194021 Russia e-mail: Kamzin@ioffe.mail.ru At present time is very important to study the surface magnetic properties, as well as to understand those relations with bulk properties of crystals. The best way for this was to use experimental methods which provide a possibility to compare surface and bulk properties directly. In 1988 [1,2] we have combined different type of Mossbauer Spectroscopy (MS): Transmission gamma-rays MS (TMS), Conversion Electrons MS (CEMS) and Conversion X-rays MS (XMS) in one method. So, we find possibilities to extract information simultaneously from the bulk and from the surface layers of crystal by combining Mossbauer Effect measurements on radiation with a different track-length in material. Later this method was named by U. Gonser "Simultaneous Triple Radiation Mossbauer Spectroscopy" (STRMS) [3]. With the help of this method and equipment we have investigated a processes on the surface at the phase transition (spin reorientation phase transition? At Neel or Curie points) in the bulk of crystal. In the given report is observed the results of the studding the surface properties of bulk crystals. as well as the processes on the surface at the phase transiotion (at Curie or Neel point, at spin-reorientation) in the bulk. There has been shown by theoretical analysis that the experimental results obtained by STRMS are of crucial importance for understanding of fundamental magnetic properties Author expresses gratitude to the Russian Fund for Fundamental Research (grant 09-02-90447) for supporting this work References [1] A.S.Kamzin et al., International Conference "Physics of Transition Metals". USSR-1988. Proceed. pt.II, p.271 [2] A.S.Kamzin et al., Sov.Tech.Phys.Lett. 16, 616 (1990) [3] U.Gonser et al., Hyperfine Interactions 66, 95 (1991)