Dr. Robert Niemann

Department:Institute for Metallic Materials (IMW)
Position:Postdoctoral Researcher
Address:IFW Dresden
Helmholtzstraße 20
01069 Dresden
Telephone number:+49-351-4659-322
E-mail:r.niemann(at)ifw-dresden.de



Postdoctoral Researcher in Functional Magnetic Films Group

Research Interests

  • Magnetic Shape Memory Alloys
  • Magnetocaloric Materials
  • Acoustic Emission
  • Structural Phase Transitions
  • Magnetic Thin Films

Highlights

Optically observed freshly formed needles of Martensite coincide with localized acoustic events (red circles) in a Ni-Mn-Ga polycrystal.

R. Niemann et al., Phys. Rev. B (2014)

EBSD Mapping of the martensitic microstructure in an epitaxial Ni-Mn-Ga film shows the orientation of twin variants in the complex hierarchical microstructure. 

R. Niemann et al., APL Materials (2016)

 

A figure from the article was selected for the November image of the 2015 APS wall calendar. 

Curriculum Vitae

07/2016Guest at Texas A&M University
Nanoindentation on Shape Memory Films
04/2016Guest at University of Barcelona
Acoustic Emission of Magnetocaloric Materials
02/2016Guest at Institute of Physics, Academy of Science of the Czech Republic
Magnetic properties and microstructure of Magnetic Shape Memory Alloys
Since 09/2015

Postdoctoral Researcher in Functional Magnetic Films group

04/2011 -  09/2015IFW Dresden
PhD thesis in Physics on "Nucleation and Growth of Adaptive Martensite in Epitaxial Films of the Shape Memory Alloy Ni-Mn-Ga" Download (in German)
02/2012  - 04/2012Guest at University of Barcelona
Acoustic Emission of Magnetic Shape Memory Alloys
05/2011Guest at Institute of Physics, Academy of Science of the Czech Republic
Magnetocaloric Effect of Magnetic Shape Memory Alloys
10/2009  - 03/2010VON ARDENNE Anlagentechnik GmbH Dresden
Patent Research
11/2009  - 10/2010IFW Dresden
Diploma thesis in Physics on "Magnetostructural Transformation in Epitaxial Ni-Co-Mn-In Films" Download (in German)
10/2005  - 10/2010

Dresden University of Technology
Studies in Physics, Emphasis on Solid State Physics

Awards

2015IFW Junior Research Award
2013Best Poster Award of the European School of Magnetism

Publications

A list of my recent publications can also be accessed at Google Scholar.

Journal papers:15
Contributions to collected editions/proceedings:4
Invited talks:21

Journal papers

2016

R. Niemann, S. Hahn, A. Diestel, A. Backen, L. Schultz, K. Nielsch, M.F.-X. Wagner, S. Faehler: Reducing the nucleation barrier in magnetocaloric Heusler alloys by nanoindentation, APL Materials 4 (2016) Nr. 6, S. 64101/1-7 URL

2015

A. Diestel, R. Niemann, B. Schleicher, S. Schwabe, L. Schultz, S. Faehler: Field-temperature phase diagrams of freestanding and substrate-constrained epitaxial Ni-Mn-Ga-Co films for magnetocaloric applications, Journal of Applied Physics 118 (2015) Nr. 2, S. 23908/1-11 URL

B. Schleicher, R. Niemann, A. Diestel, R. Huehne, L. Schultz, S. Faehler: Epitaxial Ni-Mn-Ga-Co thin films on PMN-PT substrates for multicaloric applications, Journal of Applied Physics 118 (2015) Nr. 5, S. 53906/1-6 URL

2014

R. Niemann, J. Kopecek, O. Heczko, J. Romberg, L. Schultz, S. Faehler, E. Vives, L. Manosa, A. Planes: Localizing sources of acoustic emission during the martensitic transformation, Physical Review B 89 (2014) Nr. 21, S. 214118/1-11 URL

R. Niemann, O. Heczko, L. Schultz, S. Faehler: Inapplicability of the Maxwell relation for the quantification of caloric effects in anisotropic ferroic materials, International Journal of Refrigeration 37 (2014), S. 281-288 URL

2013

S. Kauffmann-Weiss, A. Kauffmann, R. Niemann, J. Freudenberger, L. Schultz, S. Faehler: Twinning phenomena along and beyond the bain path, metals 4 (2013), S. 319-336 URL

P. Klaer, H.C. Herper, P. Entel, R. Niemann, L. Schultz, S. Faehler, H.J. Elmers: Electronic structure of the austenitic and martensitic state of magnetocaloric Ni-Mn-In Heusler alloy films, Physical Review B 88 (2013) Nr. 17, S. 174414/1-8 URL

2012

B. Erkartal, V. Duppel, R. Niemann, L. Schultz, S. Faehler, U. Schuermann, L. Kienle: Structure and composition of magnetocaloric Ni-Mn-In-Co thin films on the nanoscale - A TEM Study, Advanced Engineering Materials 14 (2012) Nr. 8, S. 710-715 URL

R. Niemann, U.K. Roessler, M.E. Gruner, O. Heczko, L. Schultz, S. Faehler: The role of adaptive martensite in magnetic shape memory alloys, Advanced Engineering Materials 14 (2012) Nr. 8, S. 562-581 URL

R. Niemann, J. Baro, O. Heczko, L. Schultz, S. Faehler, E. Vives, L. Manosa, A. Planes: Tuning avalanche criticality: Acoustic emission during the martensitic transformation of a compressed Ni-Mn-Ga single crystal, Physical Review B 86 (2012) Nr. 21, S. 214101/1-6 URL

R. Niemann, L. Schultz, S. Faehler: Growth of sputter-deposited metamagnetic epitaxial Ni-Co-Mn-In films, Journal of Applied Physics 111 (2012) Nr. 9, S. 93909/1-7 URL

2011

S. Kaufmann, R. Niemann, T. Thersleff, U.K. Roessler, O. Heczko, J. Buschbeck, B. Holzapfel, L. Schultz, S. Faehler: Modulated martensite: why it forms and why it deforms easily, New Journal of Physics 13 (2011) Nr. 5, S. 53029/1-24 URL

2010

R. Niemann, O. Heczko, L. Schultz, S. Faehler: Metamagnetic transitions and magnetocaloric effect in epitaxial Ni-Co-Mn-In films, Applied Physics Letters 97 (2010) Nr. 22, S. 222507/1-3 URL

2009

J. Buschbeck, R. Niemann, O. Heczko, M. Thomas, L. Schultz, S. Faehler: In situ studies of the martensitic transformation in epitaxial Ni–Mn–Ga films, Acta Materialia 57 (2009) Nr. 8, S. 2516-2526 URL

O. Heczko, M. Thomas, R. Niemann, L. Schultz, S. Faehler: Magnetically induced martensite transition in freestanding epitaxial Ni–Mn–Ga films, Applied Physics Letters 94 (2009) Nr. 15, S. 152513/1-3 URL

Contributions to collected editions/proceedings

2014

R. Niemann, A. Diestel, A. Backen, U.K. Roessler, C. Behler, S. Hahn, M.F.-X. Wagner, L. Schultz, S. Faehler: Controlling reversibility of the magneto-structural transition in first-order materials on the micro scale, 6th International Conference on Magnetic Refrigeration at Room Temperature (Thermag VI), Victoria/ Canada, 7.-10.9.14, in: Proceedings, 1623/1-2 (2014)

2012

R. Niemann, O. Heczko, L. Schultz, S. Faehler: Failure of the Maxwell relation for the quantification of caloric effects in ferroic materials, 5th International Conference on Magnetic Refrigeration at Room Temperature (Thermag V), Grenoble/ France, 17.-20.9.2012, in: Proceedings, 219-226 (2012)

2009

A. Backen, R. Niemann, S. Kaufmann, J. Buschbeck, L. Schultz, S. Faehler: The effect of post annealing on structure, microstructure and magnetic properties of thin Ni-Mn-Ga films, ESOMAT 2009 - 8th European Symposium on Martensitic Transformations, in: Proceedings, 4002/1-7 (2009) URL

2008

S. Faehler, O. Heczko, M. Thomas, R. Niemann, J. Buschbeck, L. Schultz: Recent progress towards active epitaxial Ni-Mn-Ga magnetic shape memory films, Actuator 2008, 11th International Conference on New Actuators, Bremen, 9.-11.6.08, in: Proceedings, 754-757 (2008)

Invited talks

2016

R. Niemann, S. Hahn, A. Diestel, A. Backen, L. Schultz, K. Nielsch, M.F.-X. Wagner, S. Faehler: Nucleation barrier of martensite in magnetic shape memory films, Seminar of the Department of Functional Materials, ASCR Prague, Prague/ Czech Republic, 18.2.16 (2016)

R. Niemann, A. Diestel, A. Backen, S. Hahn, M.F.-X. Wagner, L. Schultz, S. Faehler: Nucleation barrier of martensite in magnetocaloric Heusler films, 80. Jahrestagung der DPG und DPG-Frühjahrstagung, Regensburg/ Germany, 6.-11.3.16 (2016)

R. Niemann, A. Diestel, B. Schleicher, A. Backen, H. Seiner, O. Heczko, S. Hahn, M.F.-X. Wagner, L. Schultz, K. Nielsch, S. Faehler: Nucleation of martensite in epitaxial Heusler films, The Fifth International Conference on Ferromagnetic Shape Memory Alloys, Miyagi/ Japan, 5.-9.9.16 (2016)

R. Niemann, A. Diestel, A. Backen, S. Hahn, M.F.-X. Wagner, L. Schultz, S. Faehler: Nucleation barrier and transformation path of martensite in epitaxial shape memory films, Group Seminar of the Departament d'Estructura i Constituents de la Matèria, Universitat de Barcelona, Barcelona/ Spain, 7.4.16 (2016)

R. Niemann, A. Diestel, S. Hahn, M.F.-X. Wagner, L. Schultz, S. Faehler: Nucleation barrier and transformation path of martensite in epitaxial shape memory films, Group Seminar, Materials Science and Engineering Department, College Station, Texas/ USA, 28.7.16 (2016)

2015

S. Faehler, R. Niemann, C. Behler, A. Diestel, M.E. Gruner, H. Seiner, O. Heczko, L. Schultz: Formation of a hierarchical martensitic microstructure, From Grain Boundaries to Stochastic Homogenization: PIRE Workshop, Leipzig/ Germany, 20.-23.7.15 (2015)

S. Faehler, M.E. Gruner, H. Seiner, R. Niemann, L. Schultz: Origin of hysteresis in multicaloric materials, ICM, Barcelona/ Spain, 5.-10.7.15 (2015)

S. Faehler, R. Niemann, C. Behler, A. Diestel, M.E. Gruner, H. Seiner, O. Heczko, L. Schultz: Formation of a hierarchical martensitic microstructure in epitaxial Ni-Mn-Ga films, European Symposium on Martensitic Transformations (ESOMAT), Antwerpen/ Belgium, 14.-18.9.15 (2015)

R. Niemann, A. Backen, C. Behler, A. Diestel, J. Romberg, L. Schultz, S. Faehler, J. Kopeczek, O. Heczko, J. Baro, E. Vives, L. Manosa, A. Planes: Two dimensional localization of acoustic emission during the martensitic transformation, Seminar im Dipartimento di Matematica, Politecnico di Milano, Milano/ Italy, 26.3.15 (2015)

R. Niemann, A. Diestel, B. Schleicher, S. Kauffmann-Weiss, C. Behler, A. Backen, U.K. Roessler, H. Seiner, O. Heczko, S. Hahn, M.F.-X. Wagner, L. Schultz, S. Faehler: Epitaxial magnetic shape memory films for magnetocaloric applications, Donostia International Workshop on Energy, Materials and Nanotechnology, San Sebastian/ Spain, 1.-4.9.15 (2015)

R. Niemann, S. Kauffmann-Weiss, C. Behler, A. Diestel, A. Backen, U.K. Roessler, H. Seiner, O. Heczko, S. Hahn, M.F.-X. Wagner, L. Schultz, S. Faehler: Phase nucleation in ferroic thin films for cooling applications, Edgar Luescher Seminar 2015, Klosters-Serneus/ Schweiz, 7.-13.2.15 (2015)

R. Niemann, J. Romberg, L. Schultz, S. Faehler, J. Kopeczek, O. Heczko, J. Baro, L. Manosa, A. Planes: Microstructural origin of martensitic avalanches, Seminar "Magnetische Nanostrukturen" der AG Farle, Universitaet Duisburg-Essen, Duisburg-Essen, 4.5.15 (2015)

2014

R. Niemann, J. Baro, J. Kopecek, O. Heczko, J. Romberg, L. Schultz, S. Faehler, E. Vives, L. Manosa, A. Planes: Microstructural origin of avalanches during the martensitic transformation, Avalanches in Functional Materials and Geophysics Workshop, Magdalene College, Cambridge/ UK, 4.-8.12.14 (2014)

R. Niemann, S. Kauffmann-Weiss, C. Behler, A. Diestel, A. Backen, U.K. Roessler, H. Seiner, O. Heczko, S. Hahn, M.F.-X. Wagner, L. Schultz, S. Faehler: Martensitic transformation in epitaxial magnetic shape memory films, Seminar of Device Materials Group, Department of Materials Science and Metallurgy, University of Cambridge, Cambridge/ UK, 8.12.14 (2014)

B. Schleicher, A. Diestel, R. Niemann, R. Huehne, L. Schultz, S. Faehler: Towards magnetocaloric effect in epitaxial Ni-Mn-Ga-Co films on piezoelectric substrates, Seminar of the Department of Functional Materials, Institute of Physics ASCR/ Czech Republic 2014, Prague/Czech Republic, 25.11.14 (2014)

2013

A. Backen, S.R. Yeduru, S. Kauffmann-Weiss, R. Niemann, A. Diestel, C. Behler, L. Schultz, M. Kohl, S. Faehler: Thin Ni-Mn-Ga films for microsystem applications: From epitaxial growth to training of freestanding films, Energy Materials Nanotechnology (EMN) Spring Meeting 2013, Orlando, Florida/ USA, 8.-11.4.13 (2013)

S. Faehler, M.E. Gruner, R. Niemann, U. Roessler: Ergodicity by ordering nanotwins, International Symposium on Non-ergodic behavior in Martensites, Duisburg, 19.1.13 (2013)

R. Niemann, A. Backen, H. Seiner, S. Kauffmann-Weiss, C. Behler, U. Roessler, L. Schultz, S. Faehler: Nucleation and microstructure of martensite in epitaxial Ni-Mn-Ga films, Seminar of the Department of Functional Materials, Institute of Physics ASCR/ Czech Republic, 26.-27.11.13 (2013)

R. Niemann, H. Seiner, C. Behler, A. Backen, S. Kauffmann-Weiss, U. Roessler, O. Heczko, L. Schultz, S. Faehler: Nucleation and microstructure of martensite in magnetic shape memory alloys, Donostia International Conference on Nanoscaled Magnetism and Applications, San Sebastian/ Spain, 9.-13.9.13 (2013)

2012

R. Niemann, U. Roessler, M. Gruner, O. Heczko, L. Schultz, S. Faehler: The importance of adaptive martensite for magnetic shape memory alloys with outstanding properties, Group Seminar of the Departament d'Estructura i Constituents de la Materia, Universitat de Barcelona, Barcelona/ Spain, 12.4.12 (2012)

2009

R. Niemann, J. Buschbeck, S. Kaufmann, A. Backen, O. Heczko, S. Faehler, L. Schultz: Preparation and characterization of epitaxial magnetic shape memory alloy films, Seminar der Academy of Sciences of the Czech Republic, Institute of Physics, Ostre/ Tschechische Republik, 24.-25.11.09 (2009)