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 Karl Franzens University Graz

Graz University of Technology 

Antiferromagnetic oxide - ferromagnetic metal interfaces: structure, chemistry, magnetism
Marco Finazzi
Politecnico di Milano
17:00 - 18:00 Tuesday 23 November 2010 KFU Graz, Hoersaal 05.01

Low-dimensional ferromagnetic (FM) and antiferromagnetic (AFM) systems display magnetic properties considerably different from the ones observed in the bulk. Moreover, AFM-FM interfaces represent a world of its own thanks to their rich phenomenology related to interface exchange coupling. Finite-size effects in both FM and AFM materials reflect deviations from bulk properties associated with the reduction of the sample dimensions. Moreover, chemical or structural effects may arise due to phenomena such as surface segregation, relaxation, or reconstruction. Hybridization, strain, or chemical interdiffusion can also dramatically affect the interface properties. The high degree of correlation between magnetic, chemical, structural and morphologic features makes the preparation and characterization of high quality samples a crucial point in any study involving low dimensional systems. In this respect, AFM transition metal monoxides are regarded as a privileged reference. These oxides can in fact be grown as high quality thin films on appropriate substrates and are characterized by a high chemical and mechanical stability and a relatively high AFM ordering temperature.