D.D. Kuznetsov1, E.I. Kuznetsova2, A.V. Mashirov3, A.S. Loshachenko4, D.V. Danilov5, G.A. Shandryuk6, V.G. Shavrov7, V.V. Koledov8

1,3,7,8 Kotel’nikov IRE of RAS (Moscow, Russia)

2 M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences (Ekaterinburg, Russia)

4,5 IRC Nanotechnology, Research Park, St. Petersburg State University (St. Petersburg, Russia)

6 A.V. Topchiev Institute of Petrochemical Synthesis, RAS (Moscow, Russia)

Problem formulating. Heusler alloys of the Ni-Mn-Z (Z = Ga, In, Sn) systems are functional materials with shape memory effect (SME), magnetic shape memory and other unique physical properties and their potential application for creating magnetic actuators, spintronic devices and solid-state magnetic cooling systems [1, 2]. However, to use these materials, it is necessary to certify the sample as accurately as possible and understand how the phase transformations occur, which result in many unique properties.

Goal. Characterize phase transformations (PT) and structures resulting from external influences on the material.

Results. The characteristic temperatures of the metamagnetostructural PT and the Curie temperature are determined, the microstructure of the material is described on the nanoscale, and the foil thickness at which the PT is blocked is determined.

Practical meaning. Determination of material characteristics depending on the volume and dimensions for use as a functional material.

Kuznetsov D.D., Kuznetsova E.I., Mashirov A.V., Loshachenko A.S., Danilov D.V., Shandryuk G.A., Shavrov V.G., Koledov V.V. In situ TEM study of phase transformations in nonstoichiometric Heisler alloy Ni46Mn41In13. Nonlinear World. 2022. V. 20.
№ 2. P. 24-27. DOI: https://doi.org/10.18127/j20700970-202202-05 (In Russian)

1. Madiligama S.B., Ari-Gur P., Shavrov V.G., Koledov V.V., Calder S., Mashirov A.V., Kamantsev A.P., Dilmieva E.T., Gonzalez-Legarreta L., Grande B.H., Vega V.V., Kayani A. Crystalline structure and magnetic behavior of the Ni41Mn39In12Co8 alloy demonstrating giant magnetocaloric effect. Smart Materials and Structures. 2016. V. 25. №. 8. P. 085013.
2. Koshkid'ko Yu.S, Dilmieva E.T., Cwik J., Rogacki K., Kowalska D., Kamantsev A.P., Koledov V.V., Mashirov A.V., Shavrov V.G., Val-
   kov V.I., Golovchan A.V., Sivachenko A.P., Shevyrtalov S.N., Rodionova V.V., Shchetinin I.V., Sampath V. Giant reversible adiabatic temperature change and isothermal heat transfer of MnAs single crystals studied by direct method in high magnetic fields. Journal of Alloys and Compounds. 2019. V. 798. P. 810-819.