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Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
Published on: November 7, 2017
Dynamic in situ visualization of voltage-driven magnetic domain evolution in multiferroic heterostructures
Ya Gao1, Jia-Mian Hu, Liang Wu
1School of Materials Science and Engineering, and State Key Lab of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, People's Republic of China.
We developed a new method to observe voltage-controlled magnetic domain changes in multiferroic heterostructures. This technique reveals significant local magnetization reorientation, crucial for understanding spintronics and reducing device heating.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Voltage control of magnetism in multiferroic heterostructures offers a solution to heating issues in spintronic devices.
- Observing voltage-modulated magnetic domain dynamics at the mesoscale is key to understanding this control mechanism but remains challenging.
Purpose of the Study:
- To explore and demonstrate a characterization method for observing dynamic, in situ, voltage-modulated magnetic domain evolution in heterostructures.
- To investigate the local magnetization reorientation in a Ni/PMN-PT heterostructure under applied voltage.
Main Methods:
- Utilized the scanning Kerr microscopy function within a magneto-optic Kerr effect system.
- Applied sweeping voltages to the PMN-PT (Pb(Mg1/3Nb2/3)O3–PbTiO3) single crystal in a Ni/PMN-PT heterostructure.
- Characterized local magnetization reorientation dynamics.
Main Results:
- Successfully observed the dynamic in situ evolution of voltage-modulated magnetic domains.
- Demonstrated significant local magnetization rotation angles in the Ni/PMN-PT heterostructure.
- Observed rotation angles exceeding those measured by macroscopic magnetization hysteresis loops.
Conclusions:
- The developed scanning Kerr microscopy method is effective for characterizing dynamic voltage-controlled magnetism in multiferroic heterostructures.
- Local magnetization reorientation under voltage is more pronounced than suggested by bulk measurements.
- This technique provides crucial insights into the mesoscale mechanisms of voltage control of magnetism.
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