Skip to Main content Skip to Navigation

Magnetism, structure and chemical order in 3d metals ad their alloys at extreme pressures

Abstract : This thesis concerns the study of the magnetic and structural transformations that occur in the 3d metals when they are compressed up to extreme pressures. The investigation has been carried out using polarized X-ray absorption (X-ray magnetic circular dichroism or XMCD) coupled to X-ray diffraction and DTF calculations and applied to the cases of cobalt, nickel and iron-cobalt (FeCo) alloys. In particular, in cobalt we present the first experimental evidence of pressure-induced suppression of ferromagnetism and we explore the interplay between structural and magnetic changes. The case of nickel, that is structurally stable over a wide range of pressures, allows to go deeper into the interpretation of the K-edge XMCD signal, so far still unsettled. Finally the investigation of the FeCo alloys is aimed at understanding the role played by the chemical order in tuning the high pressure structural and magnetic properties.
Complete list of metadatas

Cited literature [163 references]  Display  Hide  Download
Contributor : Abes Star :  Contact
Submitted on : Wednesday, May 16, 2012 - 1:07:44 PM
Last modification on : Wednesday, May 27, 2020 - 1:52:16 AM
Long-term archiving on: : Friday, August 17, 2012 - 2:30:42 AM


Version validated by the jury (STAR)


  • HAL Id : tel-00697878, version 1



Raffaella Torchio. Magnetism, structure and chemical order in 3d metals ad their alloys at extreme pressures. Other [cond-mat.other]. Université de Grenoble; Università degli studi Roma Tre, 2012. English. ⟨NNT : 2012GRENY004⟩. ⟨tel-00697878⟩



Record views


Files downloads