Abstract
The advent of ferromagnetism in 2D van der Waals (vdW) magnets has stimulated high interest in exploring topological magnetic textures, such as skyrmions for use in future skyrmion-based spintronic devices. To engineer skyrmions in vdW magnets by transforming Bloch-type magnetic bubbles into Néel-type skyrmions, a heavy metal/vdW magnetic thin film heterostructure has been made to induce interfacial Dzyaloshinskii–Moriya interaction (DMI). However, the unambiguous identification of the magnetic textures inherent to vdW magnets, for example, whether the magnetic twists (skyrmions/domain walls) are Néel- or Bloch-type, is unclear. Here we demonstrate that the magnetic twists can be tuned between Néel and Bloch-type in the vdW magnet Fe3GeTe2 (FGT) with/without interfacial DMI. We use an in-plane magnetic field to align the modulation wavevector q of the magnetizations in order to distinguish the Néel- or Bloch-type magnetic twists. We observe that q is perpendicular to the in-plane field in the heterostructure (Pt/oxidized-FGT/FGT/oxidized-FGT), while q aligns at a rotated angle with respect to the field direction in the FGT thin plate thinned from bulk. We find that the aligned domain wall twists hold fan-like modulations, coinciding qualitatively with our computational results.
Original language | English |
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Article number | 2103583 |
Journal | Advanced Functional Materials |
Volume | 31 |
Issue number | 37 |
DOIs | |
State | Published - Sep 9 2021 |
Externally published | Yes |
Funding
L.C.P. and F.S.Y. contributed equally to this work. The authors thank A. Fert, N. Reyren, and J. Masell for helpful discussions and T. Kikitsu and D. Hashizume (Materials Characterization Support Team in the RIKEN Center for Emergent Matter Science) for technical support on the TEM (JEM‐2100F). This work was funded in part by Grants‐In‐Aid for Scientific Research (A) (Grant No. 19H00660) from JSPS, Japan Science and Technology Agency (JST) CREST program (Grant No. JPMJCR20T1), and NIMS microstructural characterization platform as a program of “Nanotechnology Platform” of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan (Grant No. JPMXP09A20NM0090). X.Z. was an International Research Fellow of JSPS. X.Z. was supported by JSPS KAKENHI (Grant No. JP20F20363).
Keywords
- Fe GeTe
- Néel–Bloch twists
- Van der Waals
- magnetic skyrmion