У оквиру семинара Центра за физику чврстог стања и нове материјале, у петак 2. новембра 2018. године у 14 часова, у читаоници Института за физику „Др Драган Поповић“, др Алберто Помар, Институт за науку о материјалима у Барселони, одржаће предавање:
„Strain tuned magnetic behavior in oxide thin films“
Transition metal oxides are known by their remarkable functional properties spanning a wide range of phenomena such as ferroelectricity and magnetism, as well as colossal magnetoresistance (CMR) and high temperature superconductivity. The mechanisms behind such extraordinary properties lie on the subtle balance between competing energies in the system. In particular, the extreme sensitivity of these properties to structural distortions and crystal chemistry offers many routes for controlling and engineering new functionalities. Interestingly, epitaxial growth of thin films introduces a new degree of freedom in the equation due to the elastic energy involved to fir the different lattice parameter and structure of film and substrate. In this way, it has been demonstrated that a fine tuning of strain relaxation mechanisms may lead to unexpected properties.
In this talk, I will review some of the results of our grupo on the growth and properties of several perovskite manganese thin films. First, i will show that both, antiferromagnetic or ferromagnetic behavior may be achieved in LaMnO3 thin films by careful tuning the strain state of the film. The possible origin of this magnetic ordering will be discussed as well as its implications in the electronic properties. Furthermore, results on the magnetic anisotropy of oxide films will also be presented and their potential applications in electronic devices will be shown.
ФОТО: Институт за науку о материјалима у Барселони