2023
DOI: 10.1002/pssr.202200491
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Symmetry‐Controlled Sign Reversal and Anisotropy in Magnetoresistance of SrRuO3 Epitaxial Films

Abstract: Understanding the magnetotransport properties of SrRuO3 thin films and heterostructures is essential for both fundamental research and practical applications. While the anomalous Hall effect has been studied extensively, the longitudinal magnetotransport (i.e. magnetoresistance) is not well understood and requires further investigation. Herein, SrRuO3/SrTiO3(001) epitaxial film is used as a model system to systematically investigate the correlation between magnetoresistance and structure symmetry. As the thick… Show more

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“…A similar systematic decrease of the H c values above x = 3 was observed at 1.8 K, the temperature of which was too low to measure the ρ xy ( H ) of insulating x = 1 and 2 superlattices (Figure S4). The H c value was as high as 3.11 T for the x = 3 superlattice (red symbols, right y -axis in Figure (e)) at 1.8 K, which is more than 1,500% enhancement with respect to the SRO single film (∼0.2 T, we plot the data as x = 100) at low temperature. , Figure S3­(b) shows that the H -field-dependent magnetization along the out-of-plane direction consistently exhibits the same x -dependent H c , confirming the results of ρ xy ( H ) measurements. The large and nonmonotonic change of H c with atomic-scale precision control implies that the dimensional crossover of ferromagnetism alone cannot provide a sufficient explanation of MA modulation.…”
supporting
confidence: 79%
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“…A similar systematic decrease of the H c values above x = 3 was observed at 1.8 K, the temperature of which was too low to measure the ρ xy ( H ) of insulating x = 1 and 2 superlattices (Figure S4). The H c value was as high as 3.11 T for the x = 3 superlattice (red symbols, right y -axis in Figure (e)) at 1.8 K, which is more than 1,500% enhancement with respect to the SRO single film (∼0.2 T, we plot the data as x = 100) at low temperature. , Figure S3­(b) shows that the H -field-dependent magnetization along the out-of-plane direction consistently exhibits the same x -dependent H c , confirming the results of ρ xy ( H ) measurements. The large and nonmonotonic change of H c with atomic-scale precision control implies that the dimensional crossover of ferromagnetism alone cannot provide a sufficient explanation of MA modulation.…”
supporting
confidence: 79%
“…However, when x < 3, H c decreases with decreasing x due to the dimensional-crossover effect. The H c value of x = 100 at 1.8 K was adopted for the SRO single film from a previous study. , …”
mentioning
confidence: 99%