Dresden 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 60: Focus Session: Chiral Domain Walls in Ultrathin Films (organized by MA)
TT 60.2: Topical Talk
Mittwoch, 2. April 2014, 10:00–10:30, BEY 118
Chiral Magnetic Domain Wall Structure in Epitaxial Multilayers — •Yizheng Wu1, Gong Chen2,1, Jie Zhu1, Alpha T. N'Diaye2, Tianping Ma1, HeeYoung Kwon3, Changyeon Won3, and Andreas. K. Schmid2 — 1Physics Department,Fudan University, Shanghai, China — 2NCEM, LBNL, Berkeley, California, USA — 3Department of Physics, Kyung Hee University, Seoul , Korea
In ultrathin film, the inversion symmetry broken at interface will induce Dzyaloshinskii-Moriya interaction (DMI). In this talk, we will show that the DMI at interface will induce the chiral Néel type domain wall in perpendicularly magnetized films. The spin structure in magnetic domain wall was identified in real-space at room temperature by spin-polarized low energy electron microscopy (SPLEEM). The chiral Néel-type domain wall was identified in the magnetic stripe domain phase in Fe/Ni/Cu(001), and the chirality can switch from the right-hand cycloid in Fe/Ni/Cu(001) to the left-hand cycloid in Ni/Fe/Cu(001), which indicates that the chirality is caused by the DMI mainly located at the Fe/Ni interface [1]. The chiral domain wall structure can also be observed in [Co/Ni]n multilayer grown on Pt(111) and Ir(111)[2]. by inserting an Ir layer between the Co/Ni stack and the Pt substrate and varying the thickness of the Ir layer, we prove that domain wall chirality together with the sign and strength of the DMI can be tuned through the interface engineering, which may enable more possibility for designing of new spintronics devices.
[1] G. Chen, et al., Phys. Rev. Lett. 110, 177204 (2013) [2] G. Chen, et al., Nature Communication, 4,2671(2013)