报告摘要

In this report, a promising Ni₃₇Co₁₃Mn₃₄Ti₁₆ Heusler alloy is proposed as a refrigerant for magnetic cooling applications. Results from direct measurements of the adiabatic temperature change (ΔT_ad) reveal a perfectly stable and reversible ΔT_ad of -9 K over repeated cycles in a magnetic field of 8 T at 238 K. Furthermore, a field-driven dynamic transition between the inverse and direct MCE was observed. A direct correlation was found between the initial temperature of the sample, its position on the phase diagram, and the nature (reversible or irreversible) of the giant magnetocaloric effect. It was shown that any initial state in the phase coexistence region leads to an irreversible and cyclically unstable magnetocaloric effect. These findings establish a new foundation for ensuring the functional stability of caloric materials, representing a significant step towards their practical implementation.

简历

Dr.Adler Gamzatovisa, Leading Researcherat Laboratory of Low Temperature Physics & Magnetism, Amirkhanov Institute of Physics of Dagestan Federal Research Center of Russian, Academy of Science. He received his PhD from Amirkhanov Institute of Physics of Dagestan Scientific Center of Russian Academy of Science in 2011.Current research activities include Experimental study of thermal (specific heat, thermal conductivity, thermal diffusion), magnetotransport properties (resistivity, magnetoresistance) and magnetocaloric properties of the new magneticmaterials (manganites, multiferroics, Heusleralloys et.al.). He has published about 100 scientific papers in journals Applied Physics Letters, ACS Appl. Mater. Interfaces, Journal of Alloys and Compounds, Intermetallics, Journal of Materials Science, J. Phys D.,etc.

邀请人：王晶 副研究员、胡凤霞 研究员