248 citations · 736 across the 18 of their papers we have counts for
18 papers
Thermoelastic Harvesting Outperforming Thermoelectric Generators Below 100 °C
Bruno Neumann, Andreas Henschke, Morik Nikolic +1
Low-grade waste heat below 100 degC is one of the largest untapped opportunities in solid-state energy conversion. Three ferroic routes are candidates for recovering this resource:…
Anomalous thermal and elastic properties of an epitaxial NiTi film exhibiting R-phase
Kristýna Repček, Tomáš Grabec, David Mareš +8
Shape memory alloys like NiTi are at the core of emerging thermal management applications, including elastocaloric refrigeration, thermoelastic harvesting, and latent heat storage.…
Formation of martensitic microstructure in epitaxial Ni-Mn-Ga films after fast cooling
Yuru Ge, Fabian Ganss, Klara Lünser +5
Shape memory alloys have a wide range of applications, including high stroke actuation, energy-efficient ferroic cooling, and energy harvesting. These applications are based on a r…
Multiferroic Microstructure Created from Invariant Line Constraint
Satyakam Kar, Yuki Ikeda, Kornelius Nielsch +3
Ferroic materials enable a multitude of emerging applications, and optimum functional properties are achieved when ferromagnetic and ferroelectric properties are coupled to a first…
What is the speed limit of martensitic transformations?
Stefan Schwabe, Klara Lünser, Daniel Schmidt +3
Structural martensitic transformations enable various applications, which range from high stroke actuation and sensing to energy efficient magnetocaloric refrigeration and thermoma…
Building hierarchical martensite
Stefan Schwabe, Robert Niemann, Anja Backen +7
Martensitic materials show a complex, hierarchical microstructure containing structural domains separated by various types of twin boundaries. Several concepts exist to describe th…
Reversible tuning of magnetocaloric Ni-Mn-Ga-Co films on ferroelectric PMN-PT substrates
Benjamin Schleicher, Robert Niemann, Stefan Schwabe +4
Tuning functional properties of thin caloric films by mechanical stress is currently of high interest. In particular, a controllable magnetisation or transition temperature is desi…
Modulations in martensitic Heusler alloys originate from nanotwin ordering
Markus E. Gruner, Robert Niemann, Peter Entel +4
Heusler alloys exhibiting magnetic and martensitic transitions enable applications like magnetocaloric refrigeration and actuation based on the magnetic shape memory effect. Their…
Nucleation and growth of hierarchical martensite in epitaxial shape memory films
Robert Niemann, Anja Backen, Sandra Kauffmann-Weiss +7
Shape memory alloys often show a complex hierarchical morphology in the martensitic state. To understand the formation of this twin-within-twins microstructure, we examine epitaxia…
Growth, microstructure and thermal transformation behaviour of epitaxial Ni-Ti films
Sandra Kauffmann-Weiss, Sandra Hahn, Carmen Weigelt +3
Epitaxial films have the potential to be used as model systems for fundamental investigations on the martensitic transformation in binary NiTi. In this paper, we discuss growth of…
Geometry of Adaptive Martensite in Ni-Mn-based Heusler alloys
Robert Niemann, Sebastian Fähler
Modulated martensites play an important role in magnetic shape memory alloys, because all functional properties are closely connected to the twin microstructure and the phase bound…
Enhanced and Tunable Spin-Orbit Coupling in Tetragonally Strained Fe-Co-B Films
Ruslan Salikhov, Ludwig Reichel, Benjamin Zingsem +8
We have synthesized 20 nm thick films of tetragonally strained interstitial Fe-Co-B alloys epitaxially grown on Au55Cu45 buffer layer. The strained axis is perpendicular to the fil…
First-principles calculation of the instability leading to giant inverse magnetocaloric efects
Denis Comtesse, Markus E. Gruner, Vladimir V. Sokolovskiy +10
The structural and magnetic properties of functional Ni-Mn-Z (Z = Ga, In, Sn) Heusler alloys are studied by first-principles and Monte Carlo methods. The \textit{ab initio} calcula…
Magnetic domain pattern in hierarchically twinned epitaxial Ni-Mn-Ga films
Anett Diestel, Volker Neu, Anja Backen +2
Magnetic shape memory alloys exhibit a hierarchically twinned microstructure, which has been well examined in epitaxial Ni-Mn-Ga films. Here we analyze consequences of this twin wi…
Magnetic domain structure of epitaxial Ni-Mn-Ga films
Anett Diestel, Anja Backen, Volker Neu +2
For the magnetic shape memory effect, knowledge about the interaction between martensitic and magnetic domain structure is essential. In the case of Ni-Mn-Ga bulk material and foil…
Magnetic nanostructures by adaptive twinning in strained epitaxial films
Sandra Kauffmann-Weiss, Markus E. Gruner, Anja Backen +3
We exploit the intrinsic structural instability of the Fe70Pd30 magnetic shape memory alloy to obtain functional epitaxial films exhibiting a self-organized nanostructure. We demon…
Tuning of crystal structure and magnetic properties by exceptionally large epitaxial strains
J. Buschbeck, I. Opahle, M. Richter +7
Huge deformations of the crystal lattice can be achieved in materials with inherent structural instability by epitaxial straining. By coherent growth on seven different substrates…
Adaptive modulations of martensites
S. Kaufmann, U. K. Roessler, O. Heczko +4
Modulated phases occur in numerous functional materials like giant ferroelectrics and magnetic shape memory alloys. To understand the origin of these phases, we review and generali…