Magister en Física Médica

Facultad de Física

The (100) surface of magnetite: if the devil created the surface, his minions created the magnetite surface.

Dr. Juan de la Figuera
Departamento de sistemas de baja dimensionalidad, superficies y materia condensada.
Instituto de Química Física "Rocasolano".
Consejo Superior de Investigaciones Científicas. Madrid. España
(invitado por el profesor Javier Recio de nuestro Instituto)


In this talk we will describe our studies on the structure, magnetism and properties of the (100) magnetite surface. This surface is important for applications such as spin injectors and other roles of magnetite in spintronics. However, its properties have been debated as they differ strongly from those of bulk of magnetite. By means of low-energy electron microscopy and photoemission electron microscopy we have discovered a surface order-disorder transition [1] different from the bulk metal-insulator Verwey transition [2], determined the magnetic spin and orbital iron magnetic moment at this surface [3], and described the role of the surface in the incorporation of Co atoms to form cobalt ferrite [4].

[1] N. C. Bartelt et al, Phys. Rev. B 88 (2013) 235436
[2] J. de la Figuera et al., Phys. Rev. B 88 (2013) 161410
[2] L. Martín-Gacía et al, Phys. Rev. B 91 (2015) 020408
[3] R. Gargallo-Caballero et al, J. Chem. Phys. 144 (2016) 094704

Lugar: Auditorio Jorge Krause.

Habrá café y galletas desde las 15:45.