Giant rotating magnetocaloric effect induced by highly texturing in polycrystalline DyNiSi compound

Area of Science:

• Materials Science
• Thermodynamics
• Condensed Matter Physics

Background:

• Large rotating magnetocaloric effect (MCE) is observed in single crystals, enabling rotary magnetic refrigerators.
• Single crystal preparation is costly and complex, hindering technological development.
• Polycrystalline materials offer a potentially more accessible route for MCE applications.

Purpose of the Study:

• To investigate the potential of textured DyNiSi polycrystalline material for large rotating MCE.
• To explore DyNiSi as a viable magnetic refrigerant for novel rotary magnetic refrigerators.
• To understand the origin of the observed rotating MCE in textured DyNiSi.

Main Methods:

• Synthesis of textured DyNiSi polycrystalline material.
• Measurement of rotating magnetocaloric effect (MCE).
• Analysis of magnetocrystalline anisotropy and demagnetization effects.

Main Results:

• Observation of a giant rotating MCE in textured DyNiSi, exceeding most reported values.
• DyNiSi identified as a promising candidate for rotary magnetic refrigeration.
• Attribution of large rotating MCE to combined strong magnetocrystalline anisotropy and preferred orientation.

Conclusions:

• Textured DyNiSi exhibits significant potential as a magnetic refrigerant for low-temperature rotary magnetic refrigeration.
• This study paves the way for developing new magnetic refrigeration materials with large rotating MCE.
• The findings are beneficial for advancing rotating magnetic refrigeration technology.