Discrete Hall resistivity contribution from Néel skyrmions in multilayer nanodiscs

Katharina Zeissler, Simone Finizio, Kowsar Shahbazi, Jamie Massey, Fatma Al Ma'Mari, David M Bracher, Armin Kleibert, Mark C Rosamond, Edmund H Linfield, Thomas A Moore, Jörg Raabe, Gavin Burnell, Christopher H Marrows

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Magnetic skyrmions are knot-like quasiparticles. They are candidates for non-volatile data storage in which information is moved between fixed read and write terminals. The read-out operation of skyrmion-based spintronic devices will rely on the electrical detection of a single magnetic skyrmion within a nanostructure. Here we present Pt/Co/Ir nanodiscs that support skyrmions at room temperature. We measured the Hall resistivity and simultaneously imaged the spin texture using magnetic scanning transmission X-ray microscopy. The Hall resistivity is correlated to both the presence and size of the skyrmion. The size-dependent part matches the expected anomalous Hall signal when averaging the magnetization over the entire disc. We observed a resistivity contribution that only depends on the number and sign of skyrmion-like objects present in the disc. Each skyrmion gives rise to 22 ± 2 nΩ cm irrespective of its size. This contribution needs to be considered in all-electrical detection schemes applied to skyrmion-based devices. Not only the area of Néel skyrmions but also their number and sign contribute to their Hall resistivity.

Original languageEnglish
Pages (from-to)1161-1166
Number of pages6
JournalNature Nanotechnology
Volume13
Issue number12
Early online date1 Oct 2018
DOIs
Publication statusPublished - 31 Dec 2018

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