Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 13, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202008521
Keywords
FeGe nanostructures; Lorentz transmission electron microscopy; magnetic skyrmion strings; magnetotransport; spintronics
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Funding
- NSF [ECCS-1609585]
- NSF Graduate Research Fellowship Program [DGE-1256259]
- NSF EAPSI fellowship
- JSPS [19H00660]
- JST CREST program [JPMJCR1874]
- NIMS microstructural characterization platform as a program of Nanotechnology Platform of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [JPMXP09A19NM0138]
- Grants-in-Aid for Scientific Research [19H00660] Funding Source: KAKEN
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By investigating the temperature-dependent magnetic field-driven creation and annihilation processes of SkS in B20 FeGe nanostructures, this study reveals unique magnetoresistance features and stability regime of SkS in nanostructures.
In bulk chiral crystals, 3D structures of magnetic skyrmions form topologically protected skyrmion strings (SkS) that have shown potential as magnonic nano-waveguides for information transfer. Although SkS stability is expected to be enhanced in nanostructures of skyrmion-hosting materials, experimental observation and detection of SkS in nanostructures under an applied in-plane magnetic field is difficult. Here, temperature-dependent magnetic field-driven creation and annihilation of SkS in B20 FeGe nanostructures (nanowires and nanoplates) under in-plane magnetic field (H-||) are shown and the mechanisms behind these transformations are explained. Unusual asymmetric and hysteretic magnetoresistance (MR) features are observed but previously unexplained during magnetic phase transitions within the SkS stability regime when H-|| is along the nanostructure's long edge, which increase the sensitivity of MR detection. Lorentz transmission electron microscopy of the SkS and other magnetic textures under H-|| in corroboration with the analysis of the anisotropic MR responses elucidates the field-driven creation and annihilation processes of SkS responsible for such hysteretic MR features and reveals an unexplored stability regime in nanostructures.
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