Honolka, Jan, Dr.
 |
Office: 6 B 10 Phone: 1617 Lab: 6 B 15 Phone: 1654 Email: j.honolka@fkf.mpg.de Group: NanoMAG Current occupation: Group leader |
Research fields
-
Magnetism of nanostructured 3d/4d -metals on surfaces
Low-dimensional magnetic 3d/4d-metal structures like monoatomic chains, monoatomic layers and alloys are interesting not only from a fundamental research point of view but also because of their potential use as magnetic storage media. Effects like superparamagnetism and increased orbital moments of Fe in reduced dimensions are explored using X-ray magnetic circular dichroism (XMCD) and methods based on the magneto-optical Kerr-effect. Systems studied are single magnetic atoms on surfaces, monoatomic Fe/Pt(997) chains, 2D FePt surface alloys and long-range ordered 2D Fe/TPA molecular networks.
For further details: Magnetic nanostructures on surfaces -
Diluted Magnetic Semiconductors (DMS)
Correlations between carrier mobility and magnetism in GaMnAs can be investigated by systematic magneto-transport measurements at extremely low temperatures down to 20mK. Effects of carrier localisation in GaMnAs epilayers below 1K affect the magnetic properties of the system. Magnetic domain wall (DW) dynamics in various micropatterned geometries of thin film DW-channels are monitored via Giant Planar Hall Effect (GPHE) measurements both during constant ramping of the magnetic field and in static conditions. Pinning of DWs and demagnetizing fields play an important role in the dynamics.
For further details: Ferromagnetic semiconductors
-
Quantum transport in quasi-1-dimensional wires
Nanometer metal quantum wires made from gold are investigated in terms of quantum electrical transport at temperatures down to 20mK. Instead of using usual 4-probe measurement techniques, a novel low-noise detection scheme based on highly sensitive SQUIDs was implemented, which minimises the disturbance of the quantum system during the process of measurement. -
Acoustic and opto-electronic properties amorphous semiconductors
Surface acoustic waves (SAW) can be used to study the influence of so-called Tunneling Systems (TS) on the low-temperature acoustic properties of thin a-As2S3 films. By optical excitation of electronic defect states in the gap of the semiconductor the TSs could be influenced. Incorporating smallest amounts of Copper into the semiconductor matrix suppresses this effect, which gives valuable information on the up-to-date unknown nature of TSs.
Know-how
Optical/E-beam lithography
Bottom-up nanofabrication
Ultra-high vacuum techniques (STM, LEED, XPS, ...)
Electronics (for STM, SQUIDs, Surface acoustic wave devices)
Magnetic characterization techniques (XMCD, MOKE, Kerr-microscopy, and Magneto-transport)
Cryogenics
Relevant publications
30. C. Carbone, S. Gardonio, P. Moras, S. Lounis, M. Heide, G. Bihlmayer, N. Atodiresei, P. H. Dederichs, S. Blügel, S. Vlaic, A. Lehnert, S. Ouazi, S. Rusponi, H. Brune, J. Honolka, A. Enders, K. Kern, S. Stepanow, C. Krull, T. Balashov, A. Mugarza, and P. Gambardella
Self-assembled nanoscale magnetic networks on surfaces: fundamental interactions and functional properties
Advanced Functional Materials (2011)
29. L. Herrera Diez, M. Konuma, R. K. Kremer, J. Honolka, K. Kern, E. Placidi and F. Arciprete
Magnetoelectric properties of oxygenated (Ga,Mn)As
Phys. Rev. B 83, 094420 (2011)
28. L. Herrera Diez, M. Konuma, E. Placidi, F. Arciprete, A. W. Rushforth, R. P. Campion, B. L. Gallagher, J. Honolka, and K. Kern
Magnetism and carrier modulation in (Ga,Mn)As/organic-dye hybrid devices
Appl. Phys. Lett. 98, 022503 (2011)
27. J. Hoppler, H. Fritzsche, V. K. Malik, J. Stahn, G. Cristiani, H.-U.
Habermeier, M. Rössle, J. Honolka, A. Enders, and C. Bernhard
Polarized neutron reflectometry study of the magnetization reversal process in YBa2Cu3O7/La2/3Ca1/3MnO3 superlattices grown on SrTiO3 substrates
Phys. Rev. B 82, 174439 (2010)
PDF
26. V. Sessi, K. Kuhnke, J. Zhang, C. Tieg, O. Sipr, J. Minar, H. Ebert, J. Honolka, and K. Kern
Intrinsic orbital and spin magnetism in Rh-clusters on inert Xenon matrices
Phys. Rev. B 82, 184413 (2010)
PDF
25. A. Enders, R. Skomski, and J. Honolka
Topical Review: Magnetic surface nanostructures
J. Phys.: Condens. Matter 22, 433001 (2010)
24. S. Stepanow, J. Honolka, P. Gambardella, L. Vitali, N. Abdurakhmanova, T.-C.Tseng, S. Rauschenbach, S. L. Tait, V. Sessi, S. Klyatskaya, S. Brink, M. Ruben, and K. Kern
Spin and Orbital Magnetic Moment Anisotropies of Monodispersed Bis(Phthalocyaninato)Terbium on a Copper Surface
J. Amer. Chem. Soc. 132, 11900 (2010)
23. V. Sessi, K. Kuhnke, J. Zhang, A. Enders, P. Bencok, S. Bornemann, J.
Minar, H. Ebert, J. Honolka, and K. Kern
Cobalt nano-clusters on metal supported Xe monolayers: influence of
the substrate on cluster formation kinetics and magnetism
Phys. Rev. B 81, 195403 (2010)
PDF
22. L. Herrera Diez, J. Honolka, K. Kern, H. Kronmüller, E. Placidi, F. Arciprete,
A. W. Rushforth, R. P. Campion, and B. L. Gallagher
Magnetic aftereffect in compressively strained GaMnAs studied using Kerr microscopy
Phys. Rev. B 81, 094412 (2010)
21. J. Honolka, V. Sessi, J. Zhang, S. Hertenberger, A. Enders, and K. Kern
Substrate dependence of buffer-layer assisted growth of nanoclusters
physica status solidi 247, 1063 (2010)
20. J. Honolka, L. Herrera Diez, R. K. Kremer, K. Kern, E. Placidi and F. Arciprete
Temperature dependent Neel wall dynamics in GaMnAs/GaAs
New Journal of Physics 12, 093022 (2010)
19. J. Honolka, T.-Y. Lee, K. Kuhnke, A. Enders, R. Skomski, S. Bornemann, S. Mankovsky, J. Minar, J. Staunton, H. Ebert, M. Hessler, K. Fauth, G. Schütz, A. Buchsbaum, M. Schmid, P. Varga, and K. Kern
Magnetism of FePt Surface Alloys
Phys. Rev. Lett. 102, 067207 (2009)
18. P. Gambardella, S. Stepanow, A. Dmitriev, J. Honolka, F. de Groot, M. Lingenfelder, S. S. Gupta, D.D. Sarma, P. Bencok, S. Stanescu, S. Clair, S. Pons, Nian Lin, A. P. Seitsonen, H. Seitsonen, J. V. Barth and K. Kern
Supramolecular control of the magnetic anisotropy in two-dimensional high-spin Fe arrays at a metal interface
Nature Materials 8, 189 (2009)
17. J. Honolka, T.Y. Lee, K. Kuhnke, D. Repetto, V. Sessi, P. Wahl, A. Buchsbaum, P. Varga, S. Gardonio, C. Carbone, S. R. Krishnakumar, P. Gambardella, M. Komelj, R. Singer, M. Fähnle, K. Fauth, G. Schütz, A. Enders, and K. Kern
Complex magnetic phase in submonolayer Fe stripes on Pt(997)
Phys. Rev. B 79, 104430 (2009)
16. R. Skomski, J. Honolka, S. Bornemann, H. Ebert, and A. Enders
Dzyaloshinski-Moriya Micromagnetis of Magnetic Surface Alloys
J. of Appl. Phys. 105, 07D533 (2009)
15. L. Herrera Diez, R.K. Kremer, A. Enders, M. Rössle, E. Arac, E. Placidi, and F. Arciprete, J. Honolka, K. Kern
Complex domain wall dynamics in compressively strained Ga1-xMnxAs epilayers
Phys. Rev. B 78, 155310 (2008)
14. J. Zhang, V. Sessi, C. H. Michaelis, I. Brihuega, J. Honolka, K. Kern, R. Skomski, X. Chen, G. Rojas, and A. Enders
Ordered Layers of Co Clusters On Boron-Nitride Template Layers
Phys. Rev. B 78, 165430 (2008)
13. I. Brihuega, Ch. Michaelis, J. Zhang, S. Bose, V. Sessi, J. Honolka, M. A. Schneider, A. Enders, and K. Kern
Electronic decoupling and templating of Co nanoclusters arrays on the boron nitride nanomesh
Surface Science Letters 602, L95 (2008)
12. R. Skomski, J. Zhang, V. Sessi, J. Honolka, K. Kern, and A. Enders, K. Kern
Substrate-Controlled Growth and Magnetism of Nanosize Fe Clusters on Pt
J. Appl. Phys. 103, 07D519 (2008)
11. J. Honolka, K. Kuhnke, L. Vitali, A. Enders, S. Gardonio, C Carbone, S.R. Krishnakumar, K. Kern, P. Bencok, S. Stepanow, and P. Gambardella
Absence of local magnetic moments in Ru and Rh impurities and clusters on Ag(100) and Pt(997)
Phys. Rev. B 76, 144412 (2007)
10. S. Bornemann, J.
Minár, J.B. Staunton, J. Honolka, A. Enders, K. Kern, and H.
Ebert
Magnetic anisotropy of deposited transition metal clusters
Europ. Phys. J. D, 45, 529 (2007)
PDF
9. J. Honolka, S. Masmanidis, H.X. Tang, D.D. Awschalom, and M.L.
Roukes
Magneto-transport properties of (Ga, Mn)As close to the metal-insulator
transition: Description using Aronov-Altshuler 3D scaling theory
Phys. Rev. B 75, 245310 (2007)
PDF
8. J. Zhang, D. Repetto, V. Sessi, J. Honolka, A. Enders, and K.
Kern
Magnetism
of Fe clusters formed by buffer-layer assisted growth on Pt(997)
Europ. Phys. J. D, 45, 515 (2007)
PDF
7. D. Repetto, T.Y. Lee, S. Rusponi, J. Honolka, K. Kuhnke,
V. Sessi, U. Starke, H. Brune, P. Gambardella, C. Carbone, A. Enders,
and K. Kern
Structure and magnetism of atomically thin Fe layers on flat and
vicinal
Pt surfaces
Phys. Rev. B 74, 054408 (2006)
PDF
6. D. Repetto, J. Honolka, S. Rusponi, H. Brune, A.
Enders, and K.
Kern
Magnetism of Fe clusters and islands on Pt surfaces
Appl. Phys. A 82, 109-112 (2006)
5. K. Kuhnke, T.Y. Lee, , J. Honolka, A. Enders, M. Heßler, K. Fauth, G. Schütz, K. Kern
Stripes are stars! Pt helps Fe to stay magnetised
BESSY Highlights 2005, 18 (2005)
4. J. Honolka, S. Masmanidis, H.X. Tang, M.L. Roukes, D.D. Awschalom
Domain wall dynamics at micropatterend constrictions in (Ga, Mn)As epilayers
J. Appl. Phys 97, 63903 (2005)
3. J. Honolka, G. Kasper, S. Hunklinger,
Correlation of low-energy excitations with photodarkening in a-As2S3
Europhys. Lett. 57, 382 (2002)
2. J. Honolka, G. Kasper, S. Hunklinger,
Light-induced changes of tunneling systems in a-As2S3
Proceedings of the NATO Advanced Study Institute on Properties and Applications of amorphous materials,
Eds. M.F. Thorpe and L. Tichy, Kluwer Academic Publishers (2001)
1. G. Kasper, R. Gebhardt, J. Honolka, S. Hunklinger,
Light-induced changes of tunneling systems in a-As2S3
J. Non-Cryst. Sol. 235-237, 275 (1998)
Invited talks
Tuning Magnetic Properties through Coordination: From 2D Metal-organic Networks to Metal Nanostructures
Workshop, "Linking Structure and Magnetism in Novel Materials: Future Opportunities at an Upgraded APS"
Advanced Photon Source (APS), Argonne, USA (5.5.2010)
Tuning magnetic properties through coordination: from 2D metal-organic networks to metal nanostructures
Kolloquium, "SFB 668 - Magnetism from the single atom to the nanostructure"
University of Hamburg, Germany (9.2.2010)
Complex magnetic phases in Fe nanostructures on Pt surfaces
11th International Conference on Advanced Materials (ICAM)
Rio de Janeiro, Brasil (20.9.-25.9. 2009)
Surface supported magnetic nanostructures: insights using XMCD
Workshop "KKR and Spectroscopy -- Hands-on Course 2009
",
Ludwig-Maximilians-Universität, München, Germany (24.6.-26.6. 2009)
Domain wall dynamics and magneto-transport in (Ga, Mn)As epilayers
Seminar on Current Topics in Low temperature Solid State Physics,
Walther-Meißner Institut, München, Germany (28.11.2008)
Ferromagnetic Semiconductors
International Max-Planck Research School (IMPRS) Winterschool:"Magnetism in Nanostructures and Novel Materials",
Max-Planck-Institute for Solid State Research, Stuttgart, Germany (7.1.-9.1. 2008)
Magnetic nanostructures on surfaces studied by XMCD
Workshop "Surfaces, nano-objets et rayonnement synchrotron",
Synchrotron SOLEIL, Orme des Merisiers, Saint AUBIN, France (16.1.2007)
Shape evolution by moving matter on surfaces
International Max-Planck Research School for Advanced Materials, Part I: "Dynamics - Moving Matter on Different Time Scales",
Max-Planck-Institute for Solid State Research, Stuttgart, Germany (24.-26.4. 2006)
Domain wall dynamics in (Ga,Mn)As epilayers
Seminar, Prof. K.H. Ploog,
Paul-Drude-Institute, Berlin, Germany (18.6.2004)
Domain wall dynamics and magnetotransport in (Ga,Mn)As at low temperatures
Seminar, Prof. R. Wiesendanger,
Institute of Applied Physics, University of Hamburg, Germany (19.1.2004)
On the nature of tunneling systems in a-As2S3
Int. Workshop on "Collective Phenomena in the Low-Temperature Physics in Glasses",
Max-Planck-Institute for the Physics of Complex Systems, Dresden, Germany (2000)
Education and training
- 14/2/2001
Ph.D. in Physics,
Ruprecht-Karls-University, Heidelberg, Germany
Dissertation: On the nature of low-energy excitations in amorphous arsenic sulfide
Dissertation Advisor: Prof. S. Hunklinger Honor: Excellent ("Magna cum laude") - 4/12/1997
Physics Diploma,
Ruprecht-Karls-University, Heidelberg, Germany
Honor: Excellent ("sehr gut") - 1/4/1993
Bachelor's degree in Physics (German "Vordiplom")
Ludwig-Maximilians-University, Munich, Germany
Positions and honors
- 1/6/2003 to present
Senior Postdoc
Nanoscale Science Department, Prof. Kern
Max-Planck Institute for Solid State Research, Stuttgart, Germany - 1/8/2001- 1/6/2003
Postdoctoral Associate
Prof. Roukes' research group
California Institute of Technology, Pasadena, USA - 1/9/2001
Awarded a one year Deutsche Forschungsgemeinschaft (DFG)
scholarship for post-doctoral research. - 14/2/2001-1/8/2001
Postdoctoral Associate
Kirchhoff-Institute for Physics, Heidelberg, Germany - 9/1/1998-14/2/2001
Ph.D. Position
Research group of Prof. S. Hunklinger
Kirchhoff-Institute for Physics, Heidelberg, Germany - 1/12/1996-4/12/1997
Undergraduate Assistant
Research group of Prof. S. Hunklinger
Ruprecht-Karls-University, Heidelberg, Germany - 1/1/1995-1/1/1996
Undergraduate Assistant Prof. B. Sakmann's research group
Max-Planck-Institute for Medical Research, Heidelberg, Germany
