Wydarzenia

Seminarium Międzynarodowego Laboratorium Silnych Pól Magnetycznych i Niskich Temperatur PAN

New direct methods for measuring of magnetocaloric properties of magnetic materials in high magnetic fields

A. Kamantsev, V. Koledov, A. Mashirov

Kotelnikov Institute of Radio-engineering and Electronics of RAS, Moscow

In recent years, a large number of works was devoted to the study of new materials, such as Heusler alloys, manganites, rare-earth elements compounds etc., in which the magnetic and structural phase transitions (PT) occur near room temperature, and are accompanied by significant changes of entropy in a magnetic field. It is noted that at present, the PTs in new materials are studied mainly by indirect methods, and therefore, there is an urgent need for a new experimental direct methods of investigation of PTs in high magnetic fields. The report is devoted to the design and test of extraction calorimeter in Bitter coil. The results of preliminary experiments on measurements of ΔT (adiabatic temperature change) and Q (cooling capacity) in the field up to 14 T of Gd and metamagnetic Heusler alloy Ni₄₃Mn_37.9In_12.1Co₇ with inverse magnetocaloric effect are discussed.