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Published on: September 23, 2018
Asymmetric reversal in aged high concentration CuMn alloy
L C Barnsley1, E MacA Gray, C J Webb
1Queensland Micro- and Nanotechnology Centre, Griffith University, Brisbane 4111, Australia. lester.barnsley@griffithuni.edu.au
This study reveals that ferromagnetic clusters in aged copper-manganese alloys grow with increasing cooling field, influencing magnetic hysteresis loop asymmetry at low temperatures.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Magnetism
Background:
- Aged Cu(81.2)Mn(18.8) alloy exhibits complex magnetic behavior at low temperatures.
- Magnetic hysteresis loops show significant asymmetric reversal, sensitive to the cooling field.
Purpose of the Study:
- To explain the asymmetric magnetic reversal observed in the alloy.
- To investigate the influence of cooling field on magnetic properties.
- To model the interaction between ferromagnetic clusters and spin glass components.
Main Methods:
- Analysis of magnetic hysteresis loops at low temperatures.
- Application of a modified Stoner-Wohlfarth model.
- Utilizing Monte Carlo simulations to analyze cluster behavior.
Main Results:
- Observed asymmetric reversal explained by interacting ferromagnetic clusters and a spin glass component.
- Model successfully reproduced experimental data, providing insights into anisotropy dependence.
- Ferromagnetic cluster growth was correlated with increasing cooling field.
Conclusions:
- The magnetic behavior is governed by an ensemble of ferromagnetic clusters interacting with a spin glass.
- Cluster shape and exchange anisotropy are dependent on the cooling field.
- Increasing cooling field promotes the growth of ferromagnetic clusters.
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