Effect of Tb for Gd substitution on magnetic and magnetocaloric properties of melt-spun (Gd1-xTbx)3Co alloys. (January 2019)

• Record Type: Journal Article
• Authors: Shishkin, D.A.; Volegov, A.S.; Ogloblichev, V.V.; Mikhalev, K.N.; Gerasimov, E.G.; Terentev, P.B.; Gaviko, V.S.; Gorbunov, D.I.; Baranov, N.V.
• Is Part Of: Intermetallics. Volume 104(2019:Jan.)
• Page Start: 1
• Page End: 7
• Publication Date: 2019-01
• Subjects: Amorphous alloys -- Magnetization -- Magnetocaloric effect -- NMR spectrum -- Random anisotropy -- Exchange interaction; Intermetallic compounds -- Metallography -- Periodicals; Metallic glasses -- Periodicals; Composés intermétalliques -- Métallographie -- Périodiques; 669.94
• DOI: 10.1016/j.intermet.2018.10.013
• Languages: English
• ISSNs: 0966-9795

Abstract

Abstract: The melt-spun (Gd1-x Tbx )3 Co alloys (0 ≤ x ≤ 1) have been obtained and studied by X-ray diffraction, ac-susceptibility, magnetization in steady and pulse magnetic fields, and NMR measurements. A comparison of the results obtained on melt-spun alloys with their crystalline analogs has revealed a strong impact of amorphization on the magnetic state and magnetocaloric properties. The Gd-rich amorphous (Gd1-x Tbx )3 Co alloys (x ≤ 0.1) exhibit increased magnetic ordering temperatures in comparison with the crystalline compounds, which is attributed to the appearance of a magnetic moment on Co atoms. The substitution of Tb for Gd results in the growth of the ratio of local anisotropy to exchange. The melt quenching of the (Gd1-x Tbx )3 Co alloys allows improving their magnetocaloric properties in the temperature range from 80 K up to 170 K. Highlights: The (Gd1-x Tbx )3 Co alloys were obtained by the melt-spinning technique. Amorphization of Gd-enriched samples increases the Curie temperature. A magnetic moment on Co atoms is suggested to appear after amorphization of Gd3 Co. Amorphization of Tb-rich compounds substantially improves their MCE properties.