| Autor: |
Hopkinson DG; National Graphene Institute, The University of Manchester, M13 9PL, United Kingdom.; Department of Materials, The University of Manchester, M13 9PL, United Kingdom., Seki T; Institute of Engineering Innovation, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan., Clark N; National Graphene Institute, The University of Manchester, M13 9PL, United Kingdom.; Department of Materials, The University of Manchester, M13 9PL, United Kingdom., Chen R; Department of Computer Science, The University of Manchester, M13 9PL, United Kingdom., Zou Y; Department of Materials, The University of Manchester, M13 9PL, United Kingdom., Kimura A; Institute of Engineering Innovation, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan., Gorbachev RV; National Graphene Institute, The University of Manchester, M13 9PL, United Kingdom.; Department of Physics & Astronomy, The University of Manchester, M13 9PL, United Kingdom., Thomson T; Department of Computer Science, The University of Manchester, M13 9PL, United Kingdom., Shibata N; Institute of Engineering Innovation, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan.; Nanostructures Research Laboratory, Japan Fine Ceramic Center, Atsuta, Nagoya 456-8587, Japan., Haigh SJ; National Graphene Institute, The University of Manchester, M13 9PL, United Kingdom.; Department of Materials, The University of Manchester, M13 9PL, United Kingdom. |
| Abstrakt: |
Fe 3 GeTe 2 is a layered crystal which has recently been shown to maintain its itinerant ferromagnetic properties even when atomically thin. Here, differential phase contrast scanning transmission electron microscopy is used to investigate the domain structure in a Fe 3 GeTe 2 cross-sectional lamella at temperatures ranging from 95 to 250 K and at nanometre spatial resolution. Below the experimentally determined Curie temperature (T C ) of 191 K, stripe domains magnetised along 〈0001〉, bounded with 180 ◦ Bloch type domain walls, are observed, transitioning to mixed Bloch-Néel type where the cross-sectional thickness is reduced below 50 nm. When warming towards T C , these domains undergo slight restructuring towards uniform size, before abruptly fading at T C . Localised loss of ferromagnetic order is seen over time, hypothesised to be a frustration of ferromagnetic order from ambient oxidation and basal cracking, which could enable selective modification of the magnetic properties for device applications. |
