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Nonvolatile Control of Magnetocaloric Operating Temperature by Low Voltage
Jiahong Wen1, Xiaoyu Zhao1, Qian Li1
1National Laboratory of Solid State Microstructures and Jiangsu Key Laboratory for Nano Technology , Nanjing University , Nanjing 210093 , P.R. China.
ACS Applied Materials & Interfaces
|April 17, 2018
Summary
Voltage control of the magnetocaloric effect (MCE) in La0.7Sr0.3MnO3 films enables nonvolatile tuning of magnetic refrigeration operating temperatures. This breakthrough offers enhanced stability and potential for microscale refrigeration technologies.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Thermodynamics
Background:
- Magnetic refrigeration offers an energy-efficient alternative to conventional cooling but is limited by operating temperature ranges.
- The magnetocaloric effect (MCE) is central to magnetic refrigeration, but its practical application is hindered by temperature limitations.
Purpose of the Study:
- To investigate the voltage control of the magnetocaloric effect (MCE) in a La0.7Sr0.3MnO3 (LSMO)/CeO2/Pt device.
- To achieve nonvolatile manipulation of the MCE operating temperature using low voltages for improved magnetic refrigeration applications.
Main Methods:
- Fabrication of a LSMO/CeO2/Pt heterostructure device.
- Application of low voltages (less than 2.3 V) to the device to induce changes in MCE.
- Analysis of the resistive switching mechanism responsible for the observed nonvolatile effect.
Main Results:
- Demonstrated nonvolatile manipulation of the magnetocaloric operating temperature in LSMO films.
- Extended the magnetic entropy change peak temperature from 302 K to 312 K using voltage control.
- Achieved good stability in the voltage-induced tuning of MCE temperature.
Conclusions:
- Low-voltage, nonvolatile control of MCE temperature is feasible in LSMO-based devices.
- The resistive switching mechanism underlies the observed voltage-controlled MCE.
- This approach holds significant potential for advancing microscale refrigeration technology.
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