Coming Visitors and Research Stays:

Research area: Theoretical Studies of Quantum Magnets

Academic Affiliation: Virginia Tech, USA

Period of Stay: June 20 – July 20, 2018

Research area: Applying and developing SPM tools for challenging questions of fundamental research in this field investigating e.g. metalsemiconductor interfaces, transport in graphene, charge dynamics of single dopants in GaAs, Kondo effect and material classes like pnictides, hexaborides and iridates.

Academic Affiliation: Universität Göttingen

Period of Stay: October 1 – December 31, 2018

Affiliation: Freie Universität Berlin

Period of Stay: August 12 ~ September 19

Research Field: Scanning Tunneling Microscopy of magnetic adatoms on superconductors, Molecules on surfaces

– Seminar 1: August 14, 13:00-14:00 – “Tuning the exchange and potential scattering strength of individual magnetic adsorbates on superconductors”
– Seminar 2: August 21, 11:00-12:00 – “Transport properties through Shiba states”

Affiliation: Centro de Física de Materiales (CSIC-UPV/EHU)

Period of Stay: September 1 ~ September 30

Research Field: Nanomagnetism combined with superconductivity

Affiliation: ALBA Synchrotron Light Source, Barcelona, Spain

Research Field: Electronic and magnetic ground state of spin-orbit active transition metal compounds using x-ray spectroscopy (XAS, XMCD, RIXS)

Academic Affiliation: The Ohio State University

Research Area: Low-Temperature Scanning Tunneling Microscopy

Period of Stay: December 9 – 21, 2019

During the stay Mr. Repicky will give a talk in our center:

Date and Location: December 18th, 2019 / Saturn Seminar Room

Magnetic Textures in Chiral Magnet MnGe Observed with SP-STM

Materials with non-centrosymmetric crystal structures can host chiral spin states including magnetic skyrmions. Bulk MnGe hosts a short period magnetic state (3 nm), whose structure depends strongly on atomic lattice strain, and shows a large emergent transport signature associated with the skyrmion phase. Here, we use low-temperature (5 K) spin-polarized scanning tunneling microscopy (SP-STM) to image the magnetic textures in MnGe thin films grown via molecular beam epitaxy and study the influence of the surface on those textures. Most microscopic locations show a spin spiral phase with a 6-8 nm period and a propagation direction that is influenced by step edges, surface termination, and strain. We also report the presence of isolated target skyrmions that likely form due to local modulations in the atomic structure. The skyrmions have a triangular shape which appears to be set by the in-plane lattice vectors, and a core size of approximately 15 nm. We observe the target state is significantly more sensitive to magnetic fields than the spiral phase, and that local voltage and current pulses with the STM tip imply the texture can be ‘switched’ between states with different topological charge. To fully understand the magnetic textures in MnGe we will expand this study by investigating films of different thicknesses to vary the magnetic anisotropy.

Academic Affiliation: C2N, Department of Nanoelectronics, CNRS, France

Research Area: STM spectroscopy, Superconductivity, Topological Insulators

Research stay period: February 2020 – July 2020

Academic Affiliation: Research Center Jülich, Germany

Research Area: Understing fundamental properties on the nanoscale with the focus on magnetic excitations and correlated systems.

Research stay period: February 09 – 22, 2020

During the visit Prof. Ternes will give three talks in our Center.

Academic Affiliation: Centro De Fisica De Materiales, Spain

Research Area: Nanomagnetism combined with superconductivity

Research stay period: May 1 – September 30, 2020

Academic Affiliation: CSIC and DIPC, Spain

Research Area: Theory of Electronic Properties at the Nanoscale

Research stay period: July 15 – August 31, 2020

Academic Affiliation: Research associate, Institute for Solid State Physics, University of Tokyo

Fields of Specialisation: Heavy fermion compounds, Fe-based superconductors, Magnetism at interfaces and surfaces, Magnetic resonance

Research stay period: September 2020 – December 2020

Academic Affiliation: Research associate, Institute for Solid State Physics, University of Tokyo

Fields of Specialisation: Heavy fermion compounds, Fe-based superconductors, Magnetism at interfaces and surfaces, Magnetic resonance

Research stay period: March 2021 – September 2021

Academic Affiliation: School of Physics and Astronomy, the University of Birmingham, Birmingham, UK

Fields of Specialisation: Quantum and frustrated magnetism; Quantum criticality; Nuclear Magnetic Resonance (NMR); Low temperature/high magnetic field experiments.

Research stay period: April 19, 2021 – May 21, 2021