Journal
ADVANCED MATERIALS
Volume 34, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202106117
Keywords
antiferromagnetism; exchange bias; magnetic order; Ni-based superconductors; nickelates
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Funding
- National Natural Science Foundation of China [52121001, 51822101, 51861135104, 51771009, 61974078, 61704094]
- Future Fellowship (Australian Research Council) [FT160100205]
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This paper reports the successful synthesis of a series of superconducting Nd0.8Sr0.2NiO2 thin films and the observation of a large exchange bias effect between the superconducting films and a thin ferromagnetic layer, indicating the existence of antiferromagnetic order. These experimental results are fundamentally critical for the current field.
Due to the lack of any magnetic order down to 1.7 K in the parent bulk compound NdNiO2, the recently discovered 9-15 K superconductivity in the infinite-layer Nd0.8Sr0.2NiO2 thin films has provided an exciting playground for unearthing new superconductivity mechanisms. Herein, the successful synthesis of a series of superconducting Nd0.8Sr0.2NiO2 thin films ranging from 8 to 40 nm is reported. The large exchange bias effect is observed between the superconducting Nd0.8Sr0.2NiO2 films and a thin ferromagnetic layer, which suggests the existence of the antiferromagnetic order. Furthermore, the existence of the antiferromagnetic order is evidenced by X-ray magnetic linear dichroism measurements. These experimental results are fundamentally critical for the current field.
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