Ultra-low-field magneto-elastocaloric cooling in a multiferroic composite device

Area of Science:

• Solid-state physics
• Materials science
• Thermodynamics

Background:

• Caloric materials enable efficient, eco-friendly solid-state cooling via phase transitions.
• Existing magnetocaloric and elastocaloric materials have limitations like high field or stress requirements.
• Multiferroic composites offer potential for novel functionalities coupling thermal properties with multiple fields.

Purpose of the Study:

• To demonstrate a magneto-elastocaloric effect in a composite material.
• To achieve significant cooling with low magnetic field and compact geometry.
• To overcome limitations of current caloric cooling technologies.

Main Methods:

• Fabrication of a magnetostriction/superelastic alloy composite.
• Application of a low magnetic field (0.16 T).
• Measurement of temperature change under applied magnetic field.

Main Results:

• Demonstrated a magneto-elastocaloric effect in the composite.
• Achieved a cooling temperature change of 4 K.
• Utilized a compact geometry and ultra-low magnetic field.

Conclusions:

• The composite system circumvents high-stress and high-field requirements of existing caloric materials.
• This approach enables new applications, such as compact remote cooling devices.
• The study highlights the potential of multiferroic composites for advanced cooling technologies.