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Séminaire général de l’INSP

Stress on the atomic scale : From epitaxial misfit stress to magnetostriction of atomic layers - Dirk Sander - Jeudi 20 juin 2013 à 16 h 30

Dirk Sander, Max Plack Institute - Halle - Germany
Jeudi 20 juin 2013 à 16 h 30 – Salle 201 - couloir 22-32 - 2e étage

My talk focuses on the quantitative measurement of mechanical stress at surfaces and in ferromagnetic monolayers by a highly sensitive optical deflection technique. I present examples where the stress in Fe monolayers on Ir(001) is measured to reach -10.5 GPa. An astonishing high value, well beyond the elasticity limits of high strength materials. Its magnitude is quantitatively ascribed to the lattice misfit between bcc Fe and Ir of -4.9 %. I also discuss the three orders of magnitude smaller stress change in these monolayers upon an in-plane magnetization reorientation. Here, magnetoelastic stress of 9 MPa is observed in a 6 monolayer thin Fe film, which indicates a deviation of magnetostrictive properties in monolayers from the respective bulk value. The role of lattice strain for the modified magnetoelastic coupling in epitaxial monolayers is highlighted.