Reducing Thermal Hysteresis in Epitaxial Ni–Mn–Ga–Co Films by Transformation Cycling

Diestel A, Chekhonin P, Niemann R, Skrotzki W, Nielsch K, Faehler S (2018)

Publication Type: Journal article

Publication year: 2018

Journal

physica status solidi (b) Wiley

Book Volume: 255

Article Number: 1700330

Journal Issue: 2

DOI: 10.1002/pssb.201700330

Abstract

Films are of particular interest for magnetocaloric refrigeration as they allow for a fast heat exchange. Here we report on metamagnetic epitaxial Ni–Mn–Ga–Co films, where a reduction of thermal hysteresis to 50% during several tens of temperature cycles is observed. This reduction occurs by an increase of the martensitic start temperature and thus can be attributed to a facilitated nucleation of martensite. Two mechanisms for reduction of hysteresis are identified: 1) delamination, which reduces constraints from the rigid substrate and 2) the formation of defects, which reduces the nucleation barrier. The detailed analysis and interpretation of microstructure before and after cycling gives a detailed understanding of the nucleation and delamination process.

Involved external institutions

Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden DE Germany (DE) Technische Universität Dresden DE Germany (DE)

How to cite

APA:

Diestel, A., Chekhonin, P., Niemann, R., Skrotzki, W., Nielsch, K., & Faehler, S. (2018). Reducing Thermal Hysteresis in Epitaxial Ni–Mn–Ga–Co Films by Transformation Cycling. physica status solidi (b), 255(2). https://doi.org/10.1002/pssb.201700330

MLA:

Diestel, Anett, et al. "Reducing Thermal Hysteresis in Epitaxial Ni–Mn–Ga–Co Films by Transformation Cycling." physica status solidi (b) 255.2 (2018).

BibTeX: Download