Unexpected Property: Increase in the Magnetic Interactions of Cd1-yMnyS Nano-Sized Particles with Decreasing Particle Size

Feltin, Nicola; Lévy, Laurent; Ingert, D.; Pileni, Marie‐Paule

doi:10.1002/(sici)1521-4095(199903)11:5<398::aid-adma398>3.0.co;2-2

Cited by 21 publications

(11 citation statements)

References 10 publications

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“…Effort to understand extended spin interactions in the quantum confined regime has led to the revelation of host of rich physical phenomena including giant Zeeman splitting, , magnetic polaron, and zero field magnetizations . Theory , and experiments on low dimensional DMS have shown very interesting size dependent properties, specifically in achieving control over long-range spin coherence and spin polarization under weak magnetic field. , In spite of this success, properties of DMS nanocrystals have been quite controversial, as they are often plagued with matters related to the uniformity of dopant incorporation and hence the origin of the ferromagnetism from the magnetic clusters. In fact, several studies in bulk, thin films, and nanowires have shown the importance of uniform magnetic ion distribution. − Though similar studies in QDs are unavailable, statistical analysis of doping with nonuniform distribution of magnetic ions shows that the cluster formation of magnetic elements on the surface or inside the semiconductor nanocrystals results in poor magnetic response from these QDs.…”

mentioning

confidence: 99%

Uniform Doping in Quantum-Dots-Based Dilute Magnetic Semiconductor

Saha¹,

Shetty²,

Pavan³

et al. 2016

J. Phys. Chem. Lett.

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Effective manipulation of magnetic spin within a semiconductor leading to a search for ferromagnets with semiconducting properties has evolved into an important field of dilute magnetic semiconductors (DMS). Although a lot of research is focused on understanding the still controversial origin of magnetism, efforts are also underway to develop new materials with higher magnetic temperatures for spintronics applications. However, so far, efforts toward quantum-dots(QDs)-based DMS materials are plagued with problems of phase separation, leading to nonuniform distribution of dopant ions. In this work, we have developed a strategy to synthesize highly crystalline, single-domain DMS system starting from a small magnetic core and allowing it to diffuse uniformly inside a thick CdS semiconductor matrix and achieve DMS QDs. X-ray absorption fine structure (XAFS) spectroscopy and energy-dispersive X-ray spectroscopy-scanning transmission electron microscopy (STEM-EDX) indicates the homogeneous distribution of magnetic impurities inside the semiconductor QDs leading to superior magnetic property. Further, the versatility of this technique was demonstrated by obtaining ultra large particles (∼60 nm) with uniform doping concentration as well as demonstrating the high quality magnetic response.

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mentioning

confidence: 99%

Uniform Doping in Quantum-Dots-Based Dilute Magnetic Semiconductor

Saha¹,

Shetty²,

Pavan³

et al. 2016

J. Phys. Chem. Lett.

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“…In spite of its promises, and reports of Mn‐doped ZnS as early as in the year of 1994, and subsequent reports of other Mn‐doped semiconductor nanocrystals, early magnetic studies suggested near absence of any interactions between magnetic dopants, such as Mn 2+ , in II–VI semiconductor nanocrystal hosts, most probably due to the absence of any free carriers in presence of such isovalent dopants and the large separation between magnetic ions in the dilute limit . Thus, the effect of enhanced sp–d exchange interaction in modulating magneto–optic and magneto–electronic properties of DMS nanocrystals were not very successful till last decade.…”

Section: Magnetic Impurity Dopingmentioning

confidence: 99%

Luminescence, Plasmonic, and Magnetic Properties of Doped Semiconductor Nanocrystals

et al. 2017

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Introducing a few atoms of impurities or dopants in semiconductor nanocrystals can drastically alter the existing properties or even introduce new properties. For example, mid-gap states created by doping tremendously affect photocatalytic activities and surface controlled redox reactions, generate new emission centers, show thermometric optical switching, make FRET donors by enhancing the excited state lifetime, and also create localized surface plasmon resonance induced low energy absorption. In addition, researchers have more recently started focusing their attention on doped nanocrystals as an important and alternative material for solar energy conversion to meet the current demand for renewable energy. Moreover, the electrical and magnetic properties of the host are also strongly altered on doping. These beneficial dopant-induced changes suggest that doped nanocrystals with proper selections of dopant-host pairs may be helpful for generating designer materials for a wide range of current technological needs. How properties relate to the doping of a variety of semiconductor nanocrystals are summarized in this Review.

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“…Erste vielversprechende Berichte über Mn‐dotiertes ZnS erschienen bereits 1994, weitere Studien über andere Mn‐dotierte Halbleiter‐Nanokristalle folgten rasch . Frühe magnetische Studien hatten gezeigt, dass praktisch keine Wechselwirkungen zwischen magnetischen Dotanden wie Mn 2+ in II/VI‐Halbleiter‐Nanokristallen auftreten, und als höchstwahrscheinliche Ursache wurde die Abwesenheit von freien Ladungsträgern beim Vorliegen solcher isovalenter Dotanden sowie der große räumliche Abstand der magnetischen Ionen angegeben .…”

Section: Dotierung Mit Magnetischen Verunreinigungenunclassified

Dotierte Halbleiter‐Nanokristalle: Lumineszenz, plasmonische und magnetische Eigenschaften

2017

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Der Einbau bereits weniger Fremdatome in Halbleiter‐Nanokristalle kann zu einer drastischen Änderung der Eigenschaften oder gar dem Auftreten gänzlich neuer Eigenschaften führen. Zum Beispiel haben Mid‐Gap‐Zustände, die durch Dotierung generiert werden, einen enormen Einfluss auf die photokatalytische Aktivität und oberflächenkontrollierte Redoxreaktionen. Fremdatome/Dotanden erzeugen neue Emissionszentren, ermöglichen thermometrisches optisches Schaltverhalten, erhöhen die Lebensdauer der angeregten Zustände von FRET‐Donoren und erzeugen niederenergetische Absorptionen induziert durch lokalisierte Oberflächenplasmonenresonanzen. Dotierte Nanokristalle werden seit kurzem außerdem als Materialien für die Umwandlung von Sonnenenergie erforscht. Ferner werden auch die elektrischen und magnetischen Eigenschaften des Wirtmaterials durch Dotierung stark verändert. Diese vorteilhaften fremdatominduzierten Modifikationen machen dotierte Nanokristalle mit passenden Dotand‐Wirt‐Paaren zu geeigneten Kandidaten für die gezielte Herstellung von Materialien mit bestimmten Eigenschaften für eine breite Auswahl von Technologien. Die Zusammenhänge zwischen den Eigenschaften von Halbleiter‐Nanokristallen und ihrer Dotierung sind Gegenstand dieses Aufsatzes.

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Unexpected Property: Increase in the Magnetic Interactions of Cd1-yMnyS Nano-Sized Particles with Decreasing Particle Size

Cited by 21 publications

References 10 publications

Uniform Doping in Quantum-Dots-Based Dilute Magnetic Semiconductor

Uniform Doping in Quantum-Dots-Based Dilute Magnetic Semiconductor

Luminescence, Plasmonic, and Magnetic Properties of Doped Semiconductor Nanocrystals

Dotierte Halbleiter‐Nanokristalle: Lumineszenz, plasmonische und magnetische Eigenschaften

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