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Large magnetization modulation in ZnO-based memory devices with embedded graphene quantum dots
Tong Chen1, Wei Chen1, Lifu Liu1
1Key Laboratory of Advanced Films of Hebei Province, College of Physics, Hebei Normal University, Shijiazhuang 050024, China. chen07308@hebtu.edu.cn.
Physical Chemistry Chemical Physics : PCCP
|July 17, 2019
Summary
Embedding graphene quantum dots (GQDs) into ZnO films significantly enhances magnetization modulation, exceeding 500% at low voltages. This breakthrough boosts potential for advanced memory devices and spintronics applications.
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Physics
Background:
- Oxide-based resistive random-access memories (RRAM) are crucial for multifunctional memory devices and spintronics.
- Limited magnetization modulation in oxide films restricts their practical use.
- Enhancing magnetization modulation is key to advancing RRAM and spintronic applications.
Purpose of the Study:
- To significantly enhance the magnetization modulation of ZnO films.
- To investigate the role of graphene quantum dots (GQDs) in modulating ZnO film magnetization.
- To explore the potential of ZnO-GQD hybrid films for advanced electronic applications.
Main Methods:
- Fabrication of ZnO films embedded with graphene quantum dots (GQDs).
- Measurement of magnetization modulation ratios under applied electrical biases.
- Analysis of the underlying mechanisms, including oxygen exchange between ZnO and GQDs.
Main Results:
- Achieved a magnetization-modulation ratio greater than 500% in ZnO-GQD hybrid films.
- Demonstrated significant enhancement at low applied biases (0.23/-0.20 V).
- Observed the highest reported magnetization-modulation ratio in oxide films to date.
Conclusions:
- Embedding GQDs into ZnO films dramatically enhances magnetization modulation.
- Oxygen exchange facilitated by GQDs under an electric field is crucial for this enhancement.
- This approach offers a promising new direction for GQD applications in spintronics and memory devices.
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