Inverted magnetic response in severe plastically deformed nanostructured high-entropy alloy

Amitesh Paul*, Xiaojing Liu, Megumi Kawasaki, Klaus-Dieter Liss*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We present unconventional magnetization in a high-pressure torsion (HPT) CoCrFeNi nanostructured high-entropy alloy: (i) the temperature dependent magnetization protocol and DC susceptibility suggest effects of spin-clustering. Moreover, HPT-processing of the alloy produces a heterogeneous and metastable nanostructure, changing its supermagnetic character: turning superparamagnetic to superspin glass dynamics, (ii) the material shows an inverted magnetic hysteresis loop, an inversion of the central part of the loop where the remanent magnetization points in a direction opposite to the applied field. The exquisite tunability of this inverted magnetism as a function of field and temperature and its reproducibility in a quasi-equilibrium setting make this spin-clustering phenomenon unique. We account for this phenomenon in terms of a non-equilibrium population of oppositely polarized domains of an ordered ferromagnetic state, enabled through the nanostructured, highly distorted, and locally disordered crystalline medium.

Original languageEnglish
Article number052402
JournalApplied Physics Letters
Issue number5
Early online date30 Jan 2023
StatePublished - 30 Jan 2023


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