The second-order magnetic phase transition and magnetocaloric effect in all-d-metal NiCoMnTi-based Heusler alloys

Journal article (2022)

Authors

F. Zhang RST/Fundamental Aspects of Materials and Energy - AS
Kevin Westra Student
Q. Shen RST/Fundamental Aspects of Materials and Energy - AS
I. Batashev RST/Fundamental Aspects of Materials and Energy - AS
A. Kiecana RST/Fundamental Aspects of Materials and Energy - AS
N.H. van Dijk RST/Fundamental Aspects of Materials and Energy - AS
E.H. Brück RST/Fundamental Aspects of Materials and Energy - AS
Research Group
RST/Fundamental Aspects of Materials and Energy (AS) (TU Delft)
Copyright: © 2022 F. Zhang, Kevin Westra, Q. Shen, I. Batashev, A. Kiecana, N.H. van Dijk, E.H. Brück
DOI
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https://doi.org/10.1016/j.jallcom.2022.164337
Magnetocaloric effect All-d-metal Heusler alloys Ni(Co)MnTi SOMT
More Info
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Published Date

2022

Language

English

Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Fundamental Aspects of Materials and Energy

Abstract

The novel all-d-metal Ni(Co)MnTi based magnetic Heusler alloys provide an adjustable giant magnetocaloric effect and good mechanical properties. We report that the second-order magnetic phase transition can be tailored in this all-d-metal NiCoMnTi based Heusler system by optimizing the Mn/Ti ratio, resulting in a reversible ferromagnetic-to-paramagnetic magnetic transition. A candidate material Ni33Co17Mn30Ti20 with a magnetic entropy change ∆Sm of 2.3 Jkg−1K−1 for a magnetic field change of 0–5 T, has been identified. The TC and saturation magnetization MS can be controlled by adjusting the Ni/Co concentration and doping non-magnetic Cu atoms. The compositional maps of TC and MS have been established. Density functional theory (DFT) calculations reveal a direct correlation between the magnetic moments and the Co content. By combining XRD, SQUID, SEM and DFT calculations, the (micro)structural and magnetocaloric properties have been investigated systematically. This study provides a detailed insight in the magnetic phase transition for this all-d-metal Ni(Co)MnTi-based Heusler alloy system.