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20 August 2020 Magnetically doped nanocrystals: from functionality to devices
Gerd Bacher
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Proceedings Volume 11470, Spintronics XIII; 114703N (2020) https://doi.org/10.1117/12.2568478
Event: SPIE Nanoscience + Engineering, 2020, Online Only
Abstract
Combining optical, electronic, and magnetic functionality in a single material is a major challenge in spintronics. The discovery of optically triggered magnetization in transition-metal doped semiconductor nanocrystals at room temperature more than a decade ago brought chemically prepared nanoparticles into play. Here, we demonstrate how the exchange interaction between magnetic dopants and charge carriers in the host matrix can be tailored by engineering size, shape, and composition of nanocrystals. Incorporation of single magnetic impurities into colloidal quantum dots yield unique discoveries like huge zero-field exchange splittings or digital doping effects. Doping nanocrystals with an ensemble of magnetic impurities, in contrast, leads to collective spin effects like magnetic polaron formation. Embedding these materials into an electronic device, current-driven polaron formation is shown, while single nanocrystal studies reveal a pathway of directed magnetic polaron formation.
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Gerd Bacher "Magnetically doped nanocrystals: from functionality to devices", Proc. SPIE 11470, Spintronics XIII, 114703N (20 August 2020); https://doi.org/10.1117/12.2568478
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KEYWORDS
Nanocrystals
Magnetism
Polarons
Doping
Electronic components
Magnetic semiconductors
Magneto-optics
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