Effect of Co substitution on magnetic properties of Ni-Mn-Sn magnetic shape memory alloys
(1. School of Applied Science, Harbin University of Science and Technology, Harbin 150080, China;
2. School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150080, China)
2. School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150080, China)
Abstract: The effect of Co substitution on magnetic properties of Ni-Mn-Sn shape memory alloy was revealed by first-principles calculations. Large magnetization difference in Ni-Mn-Sn alloy obtained by addition of Co arises from enhancement of magnetization of austenite due to change of Mn-Mn interaction from anti-ferromagnetism to ferromagnetism. Total energy difference between paramagnetic and ferromagnetic austenite plays an important role in magnetic transition of Ni-Co-Mn-Sn. The altered Mn 3d states due to Co substitution give rise to difference in magnetic properties.
Key words: ferromagnetic shape memory alloys; Ni-Mn-Sn; first-principles calculation; magnetic properties