[Inageneral] Seminarios Dpto. FMC próxima semana: martes 11 de febrero

[Raúl Mendoza]

*Título: *Indirect Chiral Magnetic Exchange through 
Dzyaloshinskii-Moriya–Enhanced RKKY Interactions

*Ponente: * Prof. Matthias Bode (University of Würzburg)

*Lugar: *Sala de Grados de la Facultad de Ciencias*

Fecha y hora: *martes 11 de febrero a las 12:30

*Resumen de la charla:* Localized electron spins can couple magnetically 
via the Ruderman-Kittel-Kasuya-Yosida interaction even if their wave 
functions lack direct overlap. Theory predicts that spin-orbit 
scattering leads to a Dzyaloshinskii-Moriya type enhancement of this 
indirect exchange interaction, giving rise to chiral exchange terms. 
Recently, we performed a spin-polarized scanning tunneling microscopy 
study of transition metal oxide chains on the (001) surfaces of Ir and 
Pt. Our STM results confirm that the deposition of Co, Fe, Mn, and Cr on 
the (2×1) oxygen-reconstructed Ir(001) surface leads to the formation of 
quasi-one-dimensional chains with a (3×1) unit cell. In contrast, 
preparation on Pt(001) required deposition onto the cold substrate with 
subsequent annealing in an oxygen atmosphere. In particular, for MnO_2 
chains we observed highly complex spin structures. Whereas we find an 
almost antiferromagnetic Mn–Mn coupling along the chains, the 
inter-chain coupling across the non-magnetic substrates turns out to be 
chiral.  These magnetic structures observed for MnO_2 can be viewed as 
highly anisotropic Skyrmions.



*Resumen CV: */Prof. Matthias Bode holds the Chair of Experimental 
Physics II department at the University of Würzburg since 2010. After 
getting his PhD in Physics, he led between 1997 and 2006 the 
‘Nanomagnetism’ research sub-group in the University of Hamburg, where 
he contributed decisively to the development of spin resolved imaging 
techniques with atomic resolution. His studies paved the way to 
understand exotic magnetic ground states in low dimensional systems. He 
has recieved the Philip-Morris Research Award and is Distinguished 
Lecturer of the IEEE Magnetic Society. His current research interests 
are topological, magnetic and transport properties of surfaces 
investigated by Scanning Tunnelling Microscopy. /

Departamento de Física de la Materia Condesada

Facultad de Ciencias, C/ Pedro Cerbuna 12, 50009 Zaragoza (SPAIN)

Web: https://fmc.unizar.es/

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