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Real-time Hall-effect detection of current-induced magnetization dynamics in ferrimagnets

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Sala G., Krizakova V., Grimaldi E., Lambert C.-H., Devolder T., Gambardella P.,
Project Spin-orbitronics in ferromagnets and antiferromagnets
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Original article (peer-reviewed)

Journal Nature Communications
Volume (Issue) 12(1)
Page(s) 656 - 656
Title of proceedings Nature Communications
DOI 10.1038/s41467-021-20968-0

Open Access

URL http://doi.org/10.1038/s41467-021-20968-0
Type of Open Access Publisher (Gold Open Access)

Abstract

AbstractMeasurements of the transverse Hall resistance are widely used to investigate electron transport, magnetization phenomena, and topological quantum states. Owing to the difficulty of probing transient changes of the transverse resistance, the vast majority of Hall effect experiments are carried out in stationary conditions using either dc or ac. Here we present an approach to perform time-resolved measurements of the transient Hall resistance during current-pulse injection with sub-nanosecond temporal resolution. We apply this technique to investigate in real-time the magnetization reversal caused by spin-orbit torques in ferrimagnetic GdFeCo dots. Single-shot Hall effect measurements show that the current-induced switching of GdFeCo is widely distributed in time and characterized by significant activation delays, which limit the total switching speed despite the high domain-wall velocity typical of ferrimagnets. Our method applies to a broad range of current-induced phenomena and can be combined with non-electrical excitations to perform pump-probe Hall effect measurements.
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