[20p-D61-1~14] 10.1 Emerging materials in spintronics and magnetics (including fabrication and characterization methodologies)

4:45 PM - 5:00 PM JST(7:45 AM - 8:00 AM UTC)English Presentation

[20p-D61-14] First-principles study of magnetostriction and damping in Fe_4xCo_4-4xN

〇(P)Ivan Kurniawan¹, Keita Ito², Takeshi Seki^2,3, Yoshio Miura¹ (1.NIMS, 2.IMR, Tohoku Univ., 3.CSIS, Tohoku Univ.)

Keywords:

first-principles,magnetostriction,damping

The magnetostriction effect corresponds to the change in lattice dimension parallel to the applied magnetic field, which is important for applications in flexible spintronics and sensors. Recent experiments reported a large and negative magnetostriction of Fe₄N. Interestingly, it was also found that the replacement of Fe by Co resulted in a sign change of magnetostriction from negative to positive value. A strong correlation between magnetostriction and damping constant was also found. Therefore, in this study, we focus on the theoretical explanation of the relationship between magnetostriction and damping in Fe_4xCo_4-4xN. We confirm the good agreement of magnetostriction and damping trends found in experiments and theoretical study. Large minority-spin density of states (DOS) around the Fermi level was found to play an important role in the magnetostriction and damping relation.