Ferromagnetism in TiO2 and ZnO oxides by hydrogen incorporation

ODIN VAZQUEZ ROBAINA; A. F. CABRERA; ARLES GIL REBAZA; RODRÍGUEZ TORRES, CLAUDIA E.

virtual

Conferencia; 30th RAU Annual users Meeting; 2020

CNPEM

In the last 20 years the number of non-magnetic solids showing magnetic order induced by some kinds of defects increases continuously. This phenomenon to trigger the magnetic properties by defects was investigated by experiment and theory in a huge amount of papers (see [1] for a short review). This effect was also intensively investigated for ZnO and TiO2 oxides.In this work we will present results in ZnO [2] and TiO2 systems that results magnetic due to hydrogen incorporation via hydrogenation (high H2 pressure in a closed chamber at 500 C) and/or via H+ implantation (at room temperature). The samples were characterized structurally and magnetically by different techniques and particularly by X ray absorption (XAS) and magnetic circular dichroism (XMCD) at Zn-L-edge, O K-edge and/or Ti L-edge. These results combined with ab-initio calculations and spectra simulations with FDMNES contribute to the understanding of the magnetism in these systems. [1] Esquinazi, W. Hergert, D. Spemann, A. Setzer,A. Ernst, Defect-induced magnetism insolids,IEEE Transactions on Magnetics, 49(8):4668–4674, 2013.[2] O Vázquez-Robaina, AF Cabrera, M Meyer, RM Romano, A Fundora Cruz, C. Rodríguez Torres, The Journal of Physical Chemistry C 123 (32), 19851-19861 (2019).