Combinatorial synthesis and high-throughput characterization of the thin film materials system Co-Mn-Ge: Composition, structure, and magnetic properties

Steffen Salomon, Sven Hamann, Peer Decker, Alan Savan, Louisa Meshi, Alfred Ludwig

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Co-Mn-Ge is a system of interest for magnetocaloric applications as a solid state magnetic refrigerant. A thin film materials library covering a large fraction of the Co-Mn-Ge ternary composition space was fabricated by sputter deposition. After deposition, it was annealed at 600°C for 3 h and quenched subsequently. An energy-dispersive X-ray spectroscopy and X-ray diffraction-based cluster analysis revealed the regions of existence for the CoMnGe and the Co2MnGe single phase areas. Furthermore, high intensity diffraction peaks revealed the presence of the hexagonal (Co, Mn)7Ge6 phase in a region that also featured the CoMnGe phase. In this region, a non-linear, symmetric, and hysteretic shift of the (200) diffraction peak of the (Co, Mn)7Ge6 phase was observed by temperature-dependent X-ray diffraction for Co23Mn33Ge44, indicating a structural phase transition taking place between 350 and 375 K upon heating and 325 and 300 K upon cooling. This coincides with a magnetic transition near 325 K from the ferromagnetic to the paramagnetic state. However, no magnetostructural coupling was identified in the temperature range from 330 to 300 K upon cooling. Magnetostriction and an undetected structural transition of the CoMnGe phase were ruled out as probable causes for the non-linear shifts.

Original languageEnglish
Pages (from-to)1969-1974
Number of pages6
JournalPhysica Status Solidi (A) Applications and Materials Science
Volume212
Issue number9
DOIs
StatePublished - 1 Sep 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Keywords

  • combinatorial methods
  • high-throughput
  • magnetocaloric
  • sputter deposition
  • thin films

Fingerprint

Dive into the research topics of 'Combinatorial synthesis and high-throughput characterization of the thin film materials system Co-Mn-Ge: Composition, structure, and magnetic properties'. Together they form a unique fingerprint.

Cite this