What is it about?

Many alloys support our society. Alloys with diluted other elements have been used from ancient times. Recently alloys containing many elements with similar amounts have attracted much attention due to their excellent mechanical, catalytic, magnetic properties, and so on, and are called multicomponent or high-entropy alloys. We have discovered ferromagnetism in the new Ti-Nb-Cr-Ru multicomponent alloy. This is the first example of a ferromagnetic Cr-containing multicomponent alloy.

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Why is it important?

While the Cr element shows antiferromagnetic behavior, it can show ferromagnetism in compounds. However, there is a few examples of Cr-ferromagnetism. Ti-Nb-Cr-Ru alloy is the first example of ferromagnetic Cr-containing multicomponent alloy. Cr alloy can exhibit stronger ferromagnetism than iron, which is promising for a permanent magnet. Although the Ti-Nb-Cr-Ru alloy shows ferromagnetism below the Curie temperature of 38 K, the Curie temperature can be increased because multicomponent alloys possess a highly flexible materials design. Our study also presents the usefulness of the large compositional space in exploring novel phenomena.


Multicomponent or high-entropy alloys are a fascinating theme. There are plenty of combinations of elements, and these new alloys offer an excellent opportunity to find new phenomena. I hope this paper stimulates many researchers and the research area of multicomponent (high-entropy) alloys grows more rapidly.

Jiro Kitagawa
Fukuoka Kogyo Daigaku

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This page is a summary of: Discovery of ferromagnetism in new multicomponent alloy Ti–Nb–Cr–Ru, APL Materials, July 2022, American Institute of Physics, DOI: 10.1063/5.0097770.
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