Observation of Nanoscale Skyrmions in SrIrO<sub>3</sub>/SrRuO<sub>3</sub> Bilayers.
basic_science · Level V
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- Record sourced from PubMed, PMID 30935207.
- Also identified by DOI 10.1021/acs.nanolett.9b00596.
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Abstract
Skyrmion imaging and electrical detection via topological Hall (TH) effect are two primary techniques for probing magnetic skyrmions, which hold promise for next-generation magnetic storage. However, these two kinds of complementary techniques have rarely been employed to investigate the same samples. We report the observation of nanoscale skyrmions in SrIrO<sub>3</sub>/SrRuO<sub>3</sub> (SIO/SRO) bilayers in a wide temperature range from 10 to 100 K. The SIO/SRO bilayers exhibit a remarkable TH effect, which is up to 200% larger than the anomalous Hall (AH) effect at 5 K, and zero-field TH effect at 90 K. Using variable-temperature, high-field magnetic force microscopy (MFM), we imaged skyrmions as small as 10 nm, which emerge in the same field ranges as the TH effect. These results reveal a rich space for skyrmion exploration and tunability in oxide heterostructures.