Improvement of the interfacial Dzyaloshinskii-Moriya interaction by introducing a Ta buffer layer

Title
Improvement of the interfacial Dzyaloshinskii-Moriya interaction by introducing a Ta buffer layer
Authors
한동수Nam-Hui KimJinyong JungJaehun ChoJune-Seo KimHenk JM SwagtenChun-Yeol You
Issue Date
2015-10
Publisher
Applied physics letters
Citation
VOL 107, NO 14, 142408
Abstract
We report systematic measurements of the interfacial Dzyaloshinskii-Moriya interaction (iDMI) by employing Brillouin light scattering in Pt/Co/AlOx and Ta/Pt/Co/AlOx structures. By introducing a tantalum buffer layer, the saturation magnetization and the interfacial perpendicular magnetic anisotropy are significantly improved due to the better interface between heavy metal and ferromagnetic layer. From the frequency shift between Stokes-and anti-Stokes spin-waves, we successively obtain considerably larger iDM energy densities (D-max = 1.65 +/- 0.13 mJ/(2) at t(Co) = 1.35 nm) upon adding the Ta buffer layer, despite the nominally identical interface materials. Moreover, the energy density shows an inverse proportionality with the Co layer thickness, which is the critical clue that the observed iDMI is indeed originating from the interface between the Pt and Co layers.
URI
http://pubs.kist.re.kr/handle/201004/70768
ISSN
0003-6951
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