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Cho, Jaehun,Kim, Nam-Hui,Jung, Jinyong,Han, Dong-Soo,Swagten, Henk J. M.,Kim, June-Seo,You, Chun-Yeol IEEE 2018 IEEE transactions on magnetics Vol.54 No.6
<P>We investigate the interfacial Dzyaloshinskii–Moriya interaction (iDMI) and the perpendicular magnetic anisotropy (PMA) in the annealed inversion symmetry breaking structures (Pt/Co (CoFeB)/AlO<SUB><I>x</I></SUB> and Ta/CoFeB/AlO<SUB><I>x</I></SUB>) by Brillouin light scattering. The iDMI energy density of Pt/Co and Pt/CoFeB samples decreases while increasing annealing temperature, but the iDMI energy density of Ta/CoFeB sample slightly increases by increasing annealing temperature. By applying the thermal annealing process, PMA energies slightly increase at the Pt/Co interface; however, Pt/CoFeB, (Ta/CoFeB) structures are dramatically decreased (increased) by the annealing process. The effects of the annealing show complicate variation for iDMI and PMA for each structure; however, we find overall weak correlations between iDMI and PMA despite different materials and annealing process.</P>
Cho, Jaehun,Kim, Nam-Hui,Kang, Seung Ku,Hwang, Hee-Kyeong,Jung, Jinyoung,Swagten, Henk J M,Kim, June-Seo,You, Chun-Yeol IOP 2017 Journal of Physics. D, Applied Physics Vol.50 No.42
<P>We investigate the sign of the interfacial Dzyaloshinskii–Moriya interaction (iDMI) energy density in system with inversion symmetry breaking for amorphous and polycrystalline ferromagnetic layers (CoFeB, Co) sandwiched by two different or the same heavy metals (Pt, Ta). By employing Brillouin light scattering, we observe non-reciprocal spin-wave dispersions which is a fingerprint of iDMI in SiO<SUB>2</SUB>/(Pt,Ta)/(CoFeB, Co)/(Pt,Ta) systems. We carefully confirm that the signs of DMI of structurally inverted systems are changed accordingly. Negative iDMI for SiO<SUB>2</SUB>/Pt/(CoFeB, Co)/Ta and positive iDMI for SiO<SUB>2</SUB>/Ta/(CoFeB, Co)/Pt are observed, and iDMI of the symmetric structures (Pt/CoFeB/Pt and Ta/CoFeB/Ta) are not measureable with our Brillouin light scattering setup due to a negligible iDMI. For amorphous CoFeB, the magnitudes of iDMI are the same within the experimental error regardless the stacking order. For the textured Co, however, the magnitude of iDMI for Pt/Co/Ta is about 30 % larger than Ta/Co/Pt structure.</P>
Asymmetric Hysteresis for Probing Dzyaloshinskii–Moriya Interaction
Han, Dong-Soo,Kim, Nam-Hui,Kim, June-Seo,Yin, Yuxiang,Koo, Jung-Woo,Cho, Jaehun,Lee, Sukmock,Klä,ui, Mathias,Swagten, Henk J. M.,Koopmans, Bert,You, Chun-Yeol American Chemical Society 2016 NANO LETTERS Vol.16 No.7
<P>The interfacial Dzyaloshinskii-Moriya interaction (DMI) is intimately related to the prospect of superior domain wall dynamics and the formation of magnetic skyrmions. Although some experimental efforts have been recently proposed to quantify these interactions and the underlying physics, it is still far from trivial to address the interfacial DMI. Inspired by the reported tilt of the magnetization of the side edge of a thin film structure, we here present a quasi-static, straightforward measurement tool. By using laterally asymmetric triangular-shaped microstructures, it is demonstrated that interfacial DMI combined with an in-plane magnetic field yields a unique and significant shift in magnetic hysteresis. By systematic variation of the shape of the triangular objects combined with a droplet model for domain nucleation, a robust value for the strength and sign of interfacial DMI is obtained. This method gives immediate and quantitative access to DMI, enabling a much faster exploration of new DMI systems for future nanotechnology.</P>