Observation of domain wall segment jump among disorders

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In creep regime, a magnetic domain wall (DW) is regarded as a one-dimensional object that consists of many small segments. However, observation of such a specific segment motion has remained a challenge due to its small size. Here we present direct evidence of individual DW segment motion by employing electrical Hall measurement. When the DW is moved by a weak magnetic field, we find that the anomalous Hall effect (AHE) resistance, R-AHE, exhibits random jumps between two resistance states. We confirm that the R-AHE jump appears in various samples but the R-AHE jump is absent when the width of sample is narrower than DW jump size. These results imply the existence of a specific segment length that governs the DW creep motion.
Publisher
ELSEVIER
Issue Date
2020-10
Language
English
Article Type
Article
Citation

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, v.511, pp.166999

ISSN
0304-8853
DOI
10.1016/j.jmmm.2020.166999
URI
http://hdl.handle.net/10203/275550
Appears in Collection
PH-Journal Papers(저널논문)
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