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• W2956452641 abstract "The enigma of the emergent ferromagnetic state in tensile-strained $mathrm{LaCo}{mathrm{O}}_{3}$ thin films remains to be explored because of the lack of an agreed-upon explanation. The direct magnetic imaging technique using a low-temperature magnetic force microscope (MFM) is critical to reveal new aspects of the ferromagnetism by investigating the lateral magnetic phase distribution. Here we show the experimental demonstration of the rare halved occupation of the ferromagnetic state in tensile-strained $mathrm{LaCo}{mathrm{O}}_{3}$ thin films on $mathrm{SrTi}{mathrm{O}}_{3}$ substrates using the MFM. The films have a uniformly strained lattice structure and minimal oxygen vacancies (less than 2%) beyond the measurement limit. It is found that percolated ferromagnetic regions with typical sizes between 100 and 200 nm occupy about 50% of the entire film, even down to the lowest achievable temperature of 4.5 K and up to the largest magnetic field of 13.4 T. Preformed ferromagnetic droplets were still observed when the temperature is 20 K above the Curie temperature, indicating the existence of a possible Griffiths phase. Our study demonstrates a submicron-level phase separation in high-quality $mathrm{LaCo}{mathrm{O}}_{3}$ thin films, which has substantial implications in revealing the intrinsic nature of the emergent ferromagnetism." @default.
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• W2956452641 date "2019-07-16" @default.
• W2956452641 modified "2023-10-17" @default.
• W2956452641 title "Direct imaging revealing halved ferromagnetism in tensile-strained <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>LaCo</mml:mi><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math> thin films" @default.
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• W2956452641 doi "https://doi.org/10.1103/physrevmaterials.3.074406" @default.
• W2956452641 hasPublicationYear "2019" @default.
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