Magnetic properties of Tm2Fe17-xSix alloys
Chem.
Met. Alloys 3
(2010) 69-74
https://doi.org/10.30970/cma3.0128
O. BARDYN,
B. BELAN, R. GLADYSHEVSKII,
A. PIETRASZKO, W. SUSKI, K. WOCHOWSKI,
R. GORZELNIAK, A. GILEWSKI,
T. MYDLARZ
The cell parameters and magnetic properties of alloys with approximate
composition Tm2Fe17-xSix and various Tm:(Fe+Si) ratios are reported.
All the investigated compounds were found to crystallize in the hexagonal Th2Ni17
type. The magnetic properties of polycrystalline samples were investigated in
the temperature range 1.9-1100 K in various magnetic fields. The field
dependence of the magnetization was studied at T = 4.2 and 77 K in a steady magnetic field up to
14 T, and additionally in a pulsed magnetic field up to 36 T at T = 4.2 K with a pulse duration of
10 ms. The temperature dependence of the magnetization of the alloys
exhibits pronounced maxima located at various temperatures, most probably
related to spin reorientation and other magnetic anomalies. These anomalies
seem to indicate also ferrimagnetic character of the
magnetic order, resulting from opposite directions of the magnetic moments of
Fe and Tm in the investigated compounds. Additional confirmation of this
supposition is the lack of substantial difference between ZFC
(zero-field cooled) and FC (field cooled) runs, and the absence of full
saturation of magnetization, even under the highest magnetic field. The Néel (Curie) temperatures determined from the dM/dT plots amount to 383 K for x = 0 and 466 K for x =
3. For the saturation magnetic moment in a magnetic field of about 35 T at
T = 4.2 K the opposite tendency
is observed. The highest value was determined for pristine Tm2.1Fe17.9
(Ms = 35.2 μB) and the lowest value for Tm2.1Fe14.9Si3.
Magnetization of Tm–Fe–Si alloys vs. a steady magnetic field at
77 K.
Keywords
Ternary rare-earth silicides / Magnetic
properties / Magnetic phase transitions / High-magnetic field measurements