Structural and magnetic properties of YNi4-xCoxSi alloys

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Abstract

The transition-metal based alloy system YNi 4-xCo xSi shows a second-order ferromagnetic-to-paramagnetic transition near room temperature. Here, the magnetic structure, the magnetocaloric properties and the magnetic anisotropy of YNi 4-xCo xSi (x = 0–4) are investigated. For x = 3.5, 3.75 and 4.0 a Curie temperature near room temperature is observed with T C = 250, 283 and 310 K, respectively. In orientated YNi 4-xCo xSi powder samples the c axis of the hexagonal crystal structure is found to be the easy magnetic axis, with a large dominant K 2 anisotropy constant (K 2 > K 1 > 0). The magnetic structure and the preferred atomic position for Ni are demonstrated by neutron diffraction measurements. We have found a dramatic decrease in the magnetic moment at the 3 g site in the CaCu 5-type structure (space group P6/mmm), the saturation magnetization and the Curie temperature with increasing Ni concentration.

Original languageEnglish
Article number174116
Number of pages9
JournalJournal of Alloys and Compounds
Volume986
DOIs
Publication statusPublished - 2024

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