Investigation of the surfaces of metallic glasses by Mössbauer spectrometry

Abstract

The aim of this project is to continue with the investigation of F. J. Garcia Melero with the title of “Impact of ion bombardment upon structure and hyperfine parameters of Vitroperm alloys”, but in another point of view. The surfaces of NANOPERM alloys will be studied. NANOPERM alloys are interesting because of their high magnetic permeability and high remanence, and they are interesting for many applications, mainly transformers. In addition, some metallic glasses are considered as candidates for magnetic cores of accelerator radiofrequency cavities. Nevertheless, these properties mentioned before can be affected somehow. In order to study these changing properties, the surfaces of these materials will be investigated using the well-known technique of Mössbauer spectrometry, using ribbons of 57Fe75Mo8Cu1B16. In order to achieve this objective, some ribbons will be bombarded with 130keV N+ ions, and the Mössbauer technique, which does not modify the structure of the material, will be applied. Having previously applied Mössbauer spectrometry to a virgin ribbon, both types of materials, i.e. before and after ion implantation will be studied and compared. It will be seen how a NANOPERM alloy behaves after an irradiation with light ions. The methods of CEMS (Conversion Electron Mössbauer Spectrometry) and CXMS (Conversion X-ray Mössbauer Spectrometry) will be used, because they provide information from subsurface regions located at ~ 200 nm and at ~ 10 μm, respectively, and that is exactly what we need.