[16p-D419-1~18] 10.2 Fundamental and exploratory device technologies for spin

▲ [16p-D419-4] Crystalline orientation dependence of spin current transmission in epitaxial NiO film probed by thermo-spin effects

〇(P)Takumi Yamazaki¹, Takeshi Seki^1,2, Takahide Kubota³, Koki Takanashi^1,4 (1.IMR, Tohoku Univ., 2.NIMS, 3.Tohoku Univ., 4.ASRC, JAEA)

Keywords:antiferromagnet, spin caloritronics, thermoreflectance

We investigate the effect of crystal orientation on the spin current transmission characteristics of NiO films grown epitaxially on MgO(111) and MgO(001) substrates. The thermo-spin effects in Pt/NiO/CoFeB trilayers are used as a probe to measure spin current transmission in NiO. The lock-in thermoreflectance method is used to detect temperature changes induced by the thermo-spin effects. The results show that both NiO(111) and NiO(001) samples have similar temperature amplitudes in the thin NiO region, indicating no significant orientation dependence in this region. The NiO thickness dependence of spin current transmission for both NiO(111) and NiO(001) exhibits a non-monotonic decay, which differs from previous studies of a simple exponential decay. We will provide more information in the presentation on the differences in the NiO thickness dependence of the temperature amplitudes for NiO(111) and NiO(001).