Profile

Career

Summary of expertise

• Nanophysics
• Quantitative Transmission Electron Microscopy
• Defects and Interfaces
• Biomineralization

Research

Overview

Publications

Full publications list

2011

Yi-Yeoun Kim, Nicola B.J. Hetherington, Elizabeth Noel, Roland Kröger, John M. Charnock, Hugo K. Christenson, Fiona C. Meldrum,
Capillarity Creates Single-Crystal Calcite Nanowires from Amorphous Calcium Carbonate, Angew.
Chem. 123, 1 – 7 (2011).

Yi-Yeoun Kim, Kathirvel Ganesan, Pengcheng Yang, Alexander N. Kulak, Shirly Borukhin, Sasha Pechook, Luis Ribeiro, Roland Kröger, Stephen J. Eichhorn, Steven P. Armes, Boaz Pokroy & Fiona C. Meldrum
An artificial biomineral formed by incorporation of copolymer micelles in calcite crystals
Nature Materials 10 (2011)

2010

E. Brown, R. Kröger, T. Rixen,
Acicular building blocks in the corallites of Porites lutea,
J. Phys.: Conference Series, 241 012026 (2010).

A. Pratt, C. Woffinden, R. Kröger, S.P. Tear, and C. Binns,
Surface Spin Polarization of Fe Nanoclusters,
IEEE Trans Magn. 46, 1660, (2010).

N. P. Aley, M. Bowes, R.  Kröger, K.  O’Grady,
Texture and magnetic properties of exchange bias systems,
J. Appl. Phys. 107, 09D722 (2010).

2009

N. P. Aley, R. Kroeger, B. Lafferty, J. Agnew, Y. Lu, and K. O’Grady
Tuning of Anisotropy in IrMn/CoFe Exchange Bias Systems
IEEE Trans. Magn. 45, 3869-3872 (2009)

Katharina Gries, Roland Kröger, Christian Kübel, Monika Fritz, Andreas Rosenauer
Investigations of voids in the aragonite platelets of nacre
Acta Biomaterialia 5, 3038-3044 (2009)

K GRIES, R KRÖGER, C KÜBEL, M SCHOWALTER, M FRITZ and A ROSENAUER
Correlation of the orientation of stacked aragonite platelets in nacre and their connection via mineral bridges
Ultramicroscopy 109, 230-236 (2009)

2008

D Fenske, H Borchert, J Kehres, R Kröger, J Parisi, and J Kolny-Olesiak
Colloidal Synthesis of Pt Nanoparticles: On the Formation and Stability of Nanowires
Langmuir, 2008, 24 (16), 9011-9016

R Kröger
Defects and Interfacial Structure of a-plane GaN on r-plane Sapphire
Book contribution in: Nitrides with Nonpolar Surfaces (Ed. T Paskova), Wiley VCH Verlag (2008)

A PRETORIUS, T YAMAGUCHI, C KÜBEL, R KRÖGER , D HOMMEL, A ROSENAUER
Structural investigation of growth and dissolution of InxGa1-xN nano-islands grown by molecular beam epitaxy
Journal of Crystal Growth, 310, 748-56 (2008)

2007

F TUOMISTO, T PASKOVA, R KRÖGER, S FIGGE, D HOMMEL, B MONEMAR, R KERSTING
Defect distribution in a-plane GaN on Al2O3
Applied Physics Letters 90 121915 (2007)

R KRÖGER, T PASKOVA, S FIGGE, D HOMMEL, A ROSENAUER, B MONEMAR
Interfacial structure of a-plane GaN grown on r-plane sapphire
Applied Physics Letters 90 081918 (2007)

2006

TH SCHMIDT, M SIEBERT, JI FLEGE, S GANGOPADHYAY, A PRETORIUS, R KRÖGER, S FIGGE, L GREGORATTI, A BARINOV, D HOMMEL, J FALTA,
Surface segregation of Si and Mg dopants in MOVPE GaN films revealed by X-ray photoemission spectro-microscopy.
Phys. Stat. Sol. C 6, 1725-8 (2006)

L SCHAFER, M HOFER, R KRÖGER
The versatility of hot-filament activated chemical vapor deposition
Thin Solid Films 515 1017-1024 (2006)

S AGRAWAL, MS RAGHUVEER, R KRÖGER, G RAMANATH
Electrical current-induced structural changes and chemical functionalization of carbon nanotubes
Journal of Applied Physics 100 094314 (2006)

QY YAN, A PURKAYASTHA, T KIM, R KRÖGER, A BOSE, G RAMANATH
Synthesis and assembly of monodisperse high-coercivity silica-capped FePt nanomagnets of tunable size, composition, and thermal stability from microemulsions
Advanced Materials 18 2569 (2006)

T PASKOVA, R KRÖGER, S FIGGE, D HOMMEL, V DARAKCHIEVA, B MONEMAR, E PREBLE, A HANSER, NM WILLIAMS, M TUTOR
High-quality bulk a-plane GaN sliced from boules in comparison to heteroepitaxially grown thick films on r-plane sapphire
Applied Physics Letters 89 051914 (2006)

R KRÖGER, C KRUSE, C RODER, D HOMMEL, A ROSENAUER
Relaxation in crack-free AlN/CraN superlattices
Physica Status Solidi B 243 1533-1536 (2006)

H LOHMEYER, K SEBALD, C KRUSE, R KRÖGER, J GUTOWSKI, D HOMMEL, J WIERSIG, F JAHNKE
Crack free monolithic nitride vertical-cavity surface-emitting laser structures and pillar microcavities
Physica Status Solidi A 203 1749-1753 (2006)

T SCHMIDT, R KRÖGER, JI FLEGE, T CLAUSEN, J FALTA, A JANZEN, P ZAHL, P KURY, M KAMMLER, M HORN-VON HOEGEN
Less strain energy despite fewer misfit dislocations: The impact of ordering
Physical Review Letters 96 066101 (2006)

H LOHMEYER, K SEBALD, C KRUSE, R KRÖGER, J GUTOWSKI, D HOMMEL, J WIERSIG, N BAER, F JAHNKE
Confined optical modes in monolithic II-VI pillar microcavities
Applied Physics Letters 88 051101 (2006)

2005

H LOHMEYER, K SEBALD, J GUTOWSKI, R KRÖGER, C KRUSE, D HOMMEL, J WIERSIG, F JAHNKE
Resonant modes in monolithic nitride pillar microcavities
European Physical Journal B 48 291-294 (2005)

S FIGGE, T BOTTCHER, J DENNEMARCK, R KRÖGER, T PASKOVA, B MONEMAR, D HOMMEL
Optoelectronic devices on bulk GaN
Journal of Crystal Growth 281 101-106 (2005)

E ROVENTA, G ALEXE, R KRÖGER, D HOMMEL, A ROSENAUER
Structural investigations of spatial correlation of CdSe/ZnSe quantum dot stacks grown by molecular beam epitaxy
Journal of Crystal Growth 278 316-319 (2005)

R KRÖGER, S EINFELDT, R CHIERCHIA, D HOMMEL, ZJ REITMEIER, RF DAVIS, QKK LIU
On the microstructure of AlxGa1-xN layers grown on 6H-SiC(0001) substrates
Journal of Applied Physics 97 083501 (2005)

T SCHMIDT, R KRÖGER, T CLAUSEN, J FALTA, A JANZEN, M KAMMLER, P KURY, P ZAHL, M HORN-VON HOEGEN
Surfactant-mediated epitaxy of Ge on Si(111): Beyond the surface
Applied Physics Letters 86 111910 (2005)