Nanostructured surfaces

Correlation processes of magnetization and structural transfomations in Gd-Fe condensed films
V.Prysyazhnyuk
Ivan Franko National University of Lviv
Kyryla and Mephodiya Str. 8, 79005 Lviv, Ukraine
e-mail: prysjan@i.ua

Magnetic properties of films and volume samples of binary compounds of Gd-Fe (GdFe2, GdFe5, Gd2Fe17) system and also agency of formation of structure on magnetic properties were explored. The hysteresis curves for volume and thin-film samples specify in that fact that these materials belong to the class of magneto-soft compounds. It is necessary to score also the significant differences in character of hysteresis loops for volume and thin-film samples of all compounds of this system. Absolute values of a coercive force for amorphous and polycrystalline films, and volume compounds was determinate. Value of a coercive force decreases at formation of amorphous films in comparison with volume samples in 2 times. Formation of a polycrystalline phase in films give rise to increasing coercive force in 1.5 times in comparison with volume samples (polycrystalline films become more magneto-hard) [1]. Specific magnetisation and magnetic saturation of films decreases in comparison with volume samples. It is the fact speaks not disordered structure of films [2]. For conducting of the phase magnetic assaying it has been used properties of ferromagnetics which they gain in the strong magnetic fields (in a state of technical saturation). The weak dependence of a saturation magnetisation and a Curie point from a stressed state and a ferromagnetic degree of dispersion allows to choose some parametres in the capacity of phase performances. Quantity of a exertion of a magnetic field at conducting of the magnetic phase assaying made 800 ka/m. It is carried out the magnitno-phase assaying of GdFe2, GdFe5, Gd2Fe17 compounds and comparison of its results with the structures explored earlier. Results of the magnitno-phase assaying of compounds of GdFe system coincide with results of a X-ray diffraction analysis, except for GdFe3 compound [2].

1.	V. Prysyazhnyuk, O. Mykolaychuk Structural transfomations and magnetic properties of amorphous films of Gd-Fe system // Edition, Univ. Visnyk. Series: Physics. –2016. – Vol.51. –P.44-51.
2.	V. Prysyazhnyuk, O. Mykolaychuk, K. Trach The processes of magnetization in films and binary compounds of the Gd-Fe intermetallic system // Edition, Univ. Visnyk. Series: Physics –2017. –Vol.54. –P.88-99.