Contact

Porträt Dr. Hlawacek, Gregor; FWIZ-N

Dr. Gregor Hlawacek

Head Ion Induced Nanostructures
Ion Microscopy
g.hlawacekAthzdr.de
Phone: +49 351 260 3409
+49 351 260 2411

Ion Induced Nanostructures

We study processes during the interaction of low energy (10 eV – 60 keV) ions with different charge states with materials, especially for the controlled modification and nano-patterning of their surfaces. Such modifications can be material removal through sputtering of surface atoms but also near surface ion beam mixing, ion beam induced defect engineering, or implantation of guest atoms (see figure below). Bottom up as well as top down surface structuring can be achieved through the use of either broad beam irradiation or focused ion beam irradiation.

The first one allows to roughen, smoothen, or clean technical surfaces. Furthermore, the energy deposited by the continuous ion impact drives the surface out of equilibrium inducing many processes on the surface and the sub-surface region.

  

Ioneninduzierte Oberflächenprozesse

Alternatively, focused ion beams allow the top down structuring of surfaces or surface near regions with a high spatial resolution compatible with modern nanostructure fabrication requirements. In our group we employ a wide range of focused ion beams from very light nobel gas ions to small heavy ion clusters to understand the behaviour of materials and create state-of-the-art nanostructures.

Main research topics:

Foto: liquid metal ion source ©Copyright: Dr. Lothar Bischoff

Focused Ion Beams

Information about the development and application of focused ion beams using liquid metal alloy ion sources

Helium Ion Microscopy

Information about Helium Ion Microscopy with special emphasis on the Orion NanoFab installed at the HZDR.
Foto: A silicon surface after 500 eV Ar+ sputtering under 67° ©Copyright: Dr. Stefan Facsko

Pattern formation by self-organization

Information about surface modification by low-energy ion irradiation and surface analytics by scanning probe techniques
Foto: COB model ©Copyright: Dr. Richard Arthur Wilhelm

Highly Charged Ions

Foto: ArBlade - FWIZ-N Instrument ©Copyright: Dr. Nico Klingner

Setups - FWIZ-N

List of our setups for pre­paration, material modifications, analytical methods, and imaging.

Group information:

Group Members - Ion Induced Nanostructures

Current and former group members

Recent publications

Older publications can be found in the database (longer loading time)

2026

Defect Analysis of the Beta- to Gamma-Ga2O3 phase transition

U. Bektas, M. O. Liedke, H. Liu, F. Ganss, M. Butterling, N. Klingner, R. Hübner, I. Makkonen, A. Wagner, G. Hlawacek

Involved research facilities

Related publications

Permalink: https://www.hzdr.de/publications/Publ-41946

2025

High-temperature He + Irradiation of Low-iron-bearing Olivine: Laboratory Simulations of Space Weathering on Mercury

S. Snata Rout, U. Kentsch, R. Dohmen, F. Traeger, S. Prava Das, H.-W. Becker, S. Facsko, M. Ritter

Involved research facilities

Related publications

Permalink: https://www.hzdr.de/publications/Publ-42290

Design of novel SnIX (X=Br/Cl) Janus layers: Electronic, optical, photocatalytic properties, as well as defect and strain engineering

A. E. Sudheer, G. Tejaswini, M. Posselt, M. Devaraj

Downloads

Permalink: https://www.hzdr.de/publications/Publ-41853

Confinement driven spin-texture evolution in directly written nanomagnets

M. S. Anwar, I. Zelenina, P. Sobieszczyk, G. Hlawacek, K. Tveitstøl, K. Potzger, J. Faßbender, O. Hellwig, J. Lindner, M. Krupiński, M. Nord, R. Bali

Involved research facilities

Related publications

Permalink: https://www.hzdr.de/publications/Publ-41714

Characterizing Interlayer Excitons by Spectral Signature in Scattering Visible Near-Field Microscopy

O. Garrity, I. Niehues, A. Bergmann-Iwe, A. Wróblewska, L. Pirker, A. Bukhari, G. Hlawacek, T. Korn, O. Frank, P. Kusch

Involved research facilities

Related publications

Permalink: https://www.hzdr.de/publications/Publ-41685

Hydrogen adsorption energy trends in Mo/WXY (X, Y = S, Se, Te) regular and Janus TMD monolayers: A first-principles and machine learning study

G. Tejaswini, A. E. Sudheer, A. Kumar, P. K. Perepu, M. Vallinayagam, C. Kamal, S. M. Prakash, M. Posselt, M. Zschornak, M. Devaraj

Permalink: https://www.hzdr.de/publications/Publ-41385

Theoretical insights into PtSSe–SnSSe heterostructures for renewable energy applications

C. Karthikeyan, A. Tejaswini, A. E. Sudheer, M. Vallinayagam, M. Posselt, M. Zschornak, M. Devaraj

Permalink: https://www.hzdr.de/publications/Publ-41384

Tuning the morphology of self-assembled nanopatterns on MgO(001) surfaces by sequential broad-beam ion irradiation

D. Erb, S. Facsko

Involved research facilities

Related publications

Permalink: https://www.hzdr.de/publications/Publ-41308

Silicon spin vacuum: isotopically enriched 28silicon-on-insulator and 28silicon from ultra-high fluence ion implantation

S. Q. Lim, B. C. Johnson, S. Rubanov, N. Klingner, B. Gong, A. M. Jakob, D. Holmes, D. N. Jamieson, J. S. Williams, J. C. McCallum

Involved research facilities

Related publications

Permalink: https://www.hzdr.de/publications/Publ-40815

High-Resolution Correlative Microscopy Approach for Nanobio Interface Studies of Nanoparticle-Induced Lung Epithelial Cell Damage

R. Podlipec, L. Pirker, A. Krišelj, G. Hlawacek, A. Gianoncelli, P. Pelicon

Involved research facilities

Related publications

Permalink: https://www.hzdr.de/publications/Publ-39945

Programmable activation of quantum emitters in high-purity silicon with focused carbon ion beams

M. Hollenbach, N. Klingner, P. Mazarov, W. Pilz, A. Nadzeyka, F. Mayer, N. V. Abrosimov, L. Bischoff, G. Hlawacek, M. Helm, G. Astakhov

Involved research facilities

Related publications

Permalink: https://www.hzdr.de/publications/Publ-39025