[8a-N304-1~10] 10.1 Emerging materials in spintronics and magnetics (including fabrication and characterization methodologies)

11:30 AM - 11:45 AM JST(2:30 AM - 2:45 AM UTC)English Presentation

[8a-N304-10] Deposition temperature dependence of magnetic properties of ferrimagnetic Mn₄N epitaxial thin films on Pt/Fe/SrTiO₃(001)

〇Soushi Akita¹, Tomohiro Yasuda¹, Daisuke Ogawa², Amemiya Kenta³, Takashi Suemasu¹ (1.Tsukuba Univ., 2.NIMS, 3.KEK)

Keywords:

nitride,ferrimagnetic,spintronics

Ferrimagnetic Mn₄N thin film with an anti-perovskite structure exhibits a small magnetization (M_s = 80 kA m⁻¹) and perpendicular magnetic anisotropy (K_u = 0.1 MJ m⁻³), characteristics that enable high-speed domain wall motion driven by spin transfer torque. Therefore, we have focused on Mn₄N for high-speed magnetization control using spin torques. In this study, Mn₄N films on a heavy metal underlayer are prepared. We selected Pt as an underlayer because it is a proven source of spin injection and has a low lattice mismatch of −0.8% with Mn₄N. The bilayer structure enables us to control the magnetization of Mn₄N with spin-orbit torques in spin oscillating or switching devices. However in a previous study, Mn₄N/Pt/MgO(001) showed large surface roughness that was inherited from the Pt underlayer. Thus, we used Pt/Fe underlayer to obtain flat surface in this work. In addition, we evaluated the properties depending on the substrate temperature during Mn₄N deposition.