Nanometre Imaging of Fe3GeTe2 Ferromagnetic Domain Walls

David Hopkinson, Takehito Seki, Nick Clark, Runze Chen, Yichao Zou, Ayumi Kimura, Roman Gorbachev, Thomas Thomson, Naoya Shibata, Sarah Haigh

Research output: Contribution to journalArticlepeer-review

Abstract

Fe3GeTe2 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 Fe3GeTe2 cross-sectional lamella at temperatures ranging from 95 K to 250 K and at nanometre spatial resolution. Below the experimentally determined Curie temperature (TC) of 191 K, stripe domains magnetised along h0001i, bounded with 180º 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 TC, these domains undergo slight restructuring towards uniform size, before abruptly fading at TC. 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.
Original languageEnglish
JournalNanotechnology
Publication statusAccepted/In press - 18 Jan 2021

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    1/04/1431/10/25

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