Giant magnetoresistance and exchange-bias in oxide-based metallic multilayers

GRANADA M, ROJAS SANCHEZ C, STEREN L.B.

Buenos Aires

Congreso; At the frontiers of Condensed Matter IV; 2008

<!-- /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> In the last years, there has been much research in the area of materials for spintronics applications. Due to the wide variety of oxides available with different electric and magnetic properties, one approach to the problem is to develop heterostructures fully composed of oxides .These materials can be combined to form multilayers, with good quality interfaces, allowing the fabrication of multifunctional systems. Our group has been recently involved in the fabrication and study of LaSrMnO/LaNiO multilayers, being LaSrMnO a ferromagnetic manganite and LaNiO a Pauli paramagnet, both materials presenting a metallic behaviour below room temperature. In this talk, an overview of the magnetic and electric properties of the films, trilayers and superlattices composed of these materials will be presented. Besides from a giant magnetoresistance effect, we have observed an unexpected exchange-bias like behaviour.