Concentration dependence in kinetic arrest of first order magnetic transition in Ta doped $HfFe_2$

TL;DR

This study investigates how varying Ta concentration in HfFe2 alloys influences the kinetic arrest of the first order magnetic transition, revealing concentration-dependent irreversibility and re-entrant behavior near zero Kelvin.

Contribution

It provides new insights into the concentration dependence of kinetic arrest phenomena in Ta-doped HfFe2, highlighting the evolution of magnetic transition features with doping.

Findings

Kinetic arrest causes thermomagnetic irreversibility at low temperatures.

Re-entrant magnetic transitions observed in zero field cooled warming.

The H-T region of kinetic arrest expands with higher Ta concentration.

Abstract

Magnetic behavior of the pseudo-binary alloy $Hf_{1-x}Ta_xFe_2$ has been studied, for which the zero field ferromagnetic (FM) to antiferromagnetic (AFM) transition temperature is tuned near to T=0 K. These alloys show anomalous thermomagnetic irreversibility at low temperature due to kinetic arrest of the first order AFM-FM transition. All the three studied compositions show re-entrant transition in zero field cooled warming curve and anomalous non-monotonic variation of upper critical field in isothermal magnetization. The region in H-T space, where these features of kinetic arrest manifest themselves, increases with increasing Ta concentration.