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Unusual magnetization process and magnetocaloric effect in α-CoV2O6driven by pulsed magnetic fields
1Henan International Joint Laboratory of MXene Materials Microstructure, College of Physics and Electronic Engineering, Nanyang Normal University, Nanyang 473061, People's Republic of China.
Summary
Low-temperature step magnetization in Ising spin systems is explored in α-CoV₂O₆ using DC and pulsed fields. Anomalous behaviors arise from spin dynamics and magnetocaloric effects, revealing insights into magnetic transitions.
Area of Science:
- Condensed Matter Physics
- Magnetism
- Low-Dimensional Systems
Background:
- Low-dimensional Ising spin systems exhibit step magnetization at low temperatures.
- The material α-CoV₂O₆ is an Ising spin-chain compound known for complex magnetic behaviors.
Purpose of the Study:
- Investigate the 1/3 magnetization plateau and multiple steps in α-CoV₂O₆.
- Analyze magnetization differences between DC and pulsed magnetic fields.
- Elucidate the role of spin dynamics and magnetocaloric effects (MCE) in observed phenomena.
Main Methods:
- Combined DC and pulsed magnetic field measurements.
- Analysis of magnetization curves at various temperatures (4.2-11 K).
- Separation of intrinsic spin dynamics from temperature changes due to MCE.
Main Results:
- Pulsed fields reveal multiple magnetization steps, inverted hysteresis, and asymmetric magnetization, distinct from DC fields.
- Anomalous behaviors are attributed to spin dynamics and MCE, including temperature changes under adiabatic conditions.
- Two types of slow spin dynamics, differing in field sweep rate and temperature dependence, are identified.
- The metastable transition at H₄ is confirmed as first-order, crucial for ferrimagnetic to ferromagnetic transition.
Conclusions:
- Spin dynamics and MCE are key to understanding multistep magnetization in α-CoV₂O₆.
- Irreversible magnetic behavior is linked to slow spin dynamics.
- The study clarifies complex magnetic phenomena in related Ising spin-chain materials.
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