Event 

Title:
Seminars at the Accelerator - Defect induced magnetism: a general phenomenon in solid state physics
When:
01.10.2015 - 01.10.2015
Where:
CMAM - Madrid
Category:
Informal seminars at the Accelerator

Description

Speaker: Pablo Esquinazi, Leipzip, Germany

Title: Defect induced magnetism: A general phenomenon in solid state physics

Abstract

The influence of defects, like vacancies and non-magnetic ions in a concentration of roughly 5%, can trigger magnetic order above room temperature in nominally non-magnetic materials. This phenomenon has been observed in very different materials, like graphite-based materials, SiC and a large list of oxides without magnetic ions. After a general introduction showing examples of graphite and recent experiments in carbon nanotubes, the talk will describe recent advances on triggering magnetic order by the systematic creation of a minimum amount of cationic vacancies, stable at room temperature in ZnO. I will discuss new experimental results obtained from magnetization, magnetoresistance, magneto-photoconductivity and x-ray magnetic circular dichroism measurements on oxides microstructures. Defects like oxygen vacancies also play a mayor role in triggering magnetic order at high temperatures in Fe-based oxides like Zn-Ferrites.

Venue

CMAM
Venue:
CMAM   -   Website
Street:
Faraday 3, Campus de Cantoblanco
ZIP:
28049
City:
Madrid
Country:
Country: es

Description

The seminar takes place at the meeting room of the CMAM