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Lecture Diego Rubi

Rooster

WanneerWaar
03 juli 2006 FWN-Building 5114.0004, Nijenborgh 4, 9747 AG, Groningen
Speaker: Diego Rubi
Affiliation: Institut de Ciencia de Materials de Barcelona
Title: Tailoring the ferromagnetic interaction of functional materials for spintronics: double perovskites and ZnO-based diluted magnetic semiconductors
Date: Mon Jul 3, 2006
Start: 14.00
Location: FWN-Building 5114.0004
Host: B. Noheda
Telephone: +31 50 363 4565

Abstract

The functionality of spintronics devices requires the development and engineering of spin-polarized sources, triggering the search of ferromagnetic materials with magnetic order above room temperature and large spin polarization. Among these materials, the double perovskite Sr2FeMoO6 has raised a lot of interest due to its high Curie temperature ( approx. 400 K) and room temperature magnetoresistance. Here we present recent advances on the understanding and tailoring of the magnetic interaction of Fe-Mo based double perovskites. We have successfully explored two different approaches to increase the Curie temperature of these compounds: the substitution of the A-site with a trivalent lanthanide, and the introduction of Fe-excess in the Fe-Mo sub-lattice. In particular, we will describe the properties of the electron doped (LA)2FeMoO6 (L=La,Nd; A=Sr,Ca) and the Fe-rich AFe1+xMo1-xO6 (x>0) series.

The second part of the talk will be focused on very recent progresses on the study of ZnO-based diluted magnetic semiconductors (DMS). We will show that the ferromagnetism of both Co and Mn-doped ZnO can be switched on and off by consecutive annealings at low temperatures under suitable atmospheres. These results convincingly support the defect-mediated character of the ferromagnetic interaction of this interesting DMS system.

 

Laatst gewijzigd:22 oktober 2012 14:30