History dependent resistivity relaxation behavior of FeRh0.46Pd0.54 in H-T space

•Relaxation in polycrystalline FeRh0.46Pd0.54 depends on the path followed in H-T space.•Resistivity relaxation follows logarithmic time dependence.•For kinetically arrested state, relaxation rate (Z) increase with temperature.•For supercooled/superheated states Z depends on the available phase frac...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2020-09, Vol.509, p.1, Article 166859
Main Authors: Saha, Pampi, Rawat, R.
Format: Article
Language:English
Subjects:
Cooling curves
Cooling rate
Electrical resistivity
FePd
FeRh
First order magnetic transition
Hysteresis
Kinetic arrest
Low temperature
Metastable magnetic states
Metastable phases
Phase transitions
Reaction kinetics
Resistivity relaxation
Supercooling/Superheating
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Summary:•Relaxation in polycrystalline FeRh0.46Pd0.54 depends on the path followed in H-T space.•Resistivity relaxation follows logarithmic time dependence.•For kinetically arrested state, relaxation rate (Z) increase with temperature.•For supercooled/superheated states Z depends on the available phase fraction for transformation.•Z is one order higher in supercooled state than superheated state. Path dependent resistivity (ρ) relaxation behavior of FeRh0.46Pd0.54 is studied in magnetic field (H) – temperature (T) parameter space. It shows that within the hysteresis region of zero field ρ – T curve, relaxation rate for AFM to FM forward transition during cooling is one order higher than the reverse transition during warming. However, below the hysteresis region, kinetics of the transition dominates and relaxation behavior depends on the path followed in H-T space to reach the measurement point. These measurements show that at low temperatures relaxation rate for AFM to FM transformation decreases irrespective of metastable phase fraction and it is maximum around 75 K. This is in contrast to relaxation behavior of supercooled/superheated metastable sate where relaxation rate depends on the available phase fraction for the transformation.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2020.166859