Reduced Hysteresis and Enhanced Giant Magnetocaloric Effect in B-Doped all- d -Metal Ni - Co - Mn - Ti -Based Heusler Materials

Journal Article (2022)
Author(s)

Fengqi Zhang (TU Delft - RST/Fundamental Aspects of Materials and Energy)

I. Batashev (TU Delft - RST/Fundamental Aspects of Materials and Energy)

Niels van Dijk (TU Delft - RST/Fundamental Aspects of Materials and Energy)

EH Brück (TU Delft - RST/Fundamental Aspects of Materials and Energy)

Research Group
RST/Fundamental Aspects of Materials and Energy
Copyright
© 2022 F. Zhang, I. Batashev, N.H. van Dijk, E.H. Brück
DOI related publication
https://doi.org/10.1103/PhysRevApplied.17.054032
More Info
expand_more
Publication Year
2022
Language
English
Copyright
© 2022 F. Zhang, I. Batashev, N.H. van Dijk, E.H. Brück
Research Group
RST/Fundamental Aspects of Materials and Energy
Issue number
5
Volume number
17
Pages (from-to)
11
Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Abstract

The all-d-metal Ni-(Co)-Mn-Ti-based Heusler alloys are found to show a giant magnetocaloric effect near room temperature and are thereby potential materials for solid-state refrigeration. However, the relative large thermal hysteresis and the moderate ferromagnetic magnetization provides limitations for real applications. In the present study, we demonstrate that introducing interstitial B atoms within Ni36.5Co13.5Mn35Ti15 alloys can effectively decrease the thermal hysteresis ΔThys (down to 4.4 K), and simultaneously improve the saturation magnetization (maximum 40% enhancement) for low concentrations of B doping (up to 0.4 at. %). In comparison to the undoped reference material, the maximum magnetic entropy change (ΔSm) for the Ni36.5Co13.5Mn35Ti15B0.4 alloy shows a remarkable improvement from 9.7 to 24.3 J kg-1K-1 for an applied magnetic field change (Δμ0H) of 5 T (30.2 J kg-1K-1 for Δμ0H = 7 T). Additionally, due to the obtained low thermal hysteresis ΔThys, the maximum reversible ΔSmrev amounts to 18.9 J kg-1K-1 at 283 K for Δμ0H = 5 T (22.0 J kg-1K-1 at 281 K for Δμ0H = 7 T), which is competitive to the traditional Ni-Mn-X-based Heusler alloys (X = Ga, In, Sn, Sb). The enhancement of the magnetic moments by B doping is also observed in first-principles calculations. These calculations clarify the atomic occupancy of B and the changes in the electronic configuration. Our current study indicates that interstitial doping with a light element (boron) is an effective method to improve the magnetocaloric effect in these all-d-metal Ni-Co-Mn-Ti-based magnetic Heusler compounds.

Files

License info not available