Cd1−<i>x</i>Mn<i>x</i>Te-CdTe multilayers grown by molecular beam epitaxy

Bicknell, R. N.; Yanka, R. W.; Giles‐Taylor, N. C.; Blanks, D. K.; Buckland, Eric L.; Schetzina, J. F.

doi:10.1063/1.94981

Cited by 129 publications

(6 citation statements)

References 13 publications

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“…The successful preparation of superlattices and the consequent extension of the study of DMS to the two-dimensional regime represents one of the most exciting recent developments in the area of DMS and presents a whole new set of challenges and opportunities. [1][2][3][4][5] In this letter we report, what we believe to be, the first successful fabrication and characterization of diluted magnetic semiconductor clusters confined in all three dimensions, i.e. DMS quantum dots.…”

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Three-dimensionally confined diluted magnetic semiconductor clusters: Zn1−xMnxS

Wang

Herron

Möller

et al. 1991

Solid State Communications

157

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We report the first example of a dilute magnetic semiconductor (DMS) confined in all three dimensions (DMS quantum dot). Zn0.93Mn0.07S clusters of-25 A diameter are successfully synthesized inside a glass matrix and fully characterized by chemical analysis, x-ray diffraction, extended x-ray absorption fine structure (EXAFS), and photoluminescence spectroscopy. Effect of size quantization on the exciton energy has been observed. Preliminary magnetic susceptibility data are presented and discussed.Diluted magnetic semiconductors (DMS) of the type All_lxMnx BVI,--where a part of the Group II cation, A, is randomly substituted by the magnetic ion, Mn ++, have received extensive studies recently. 1 The presence of localized magnetic ions in a semiconductor alloy leads to an exchange interaction between the sp band electrons and the d electrons of the Mn ++. This sp-d exchange interaction constitutes a unique interplay between semiconductor physics and magnetism and results in unusual magnetotransport and magneto-optic phenomena such as a large Faraday rotation, giant negative magneto-resistance, and a magnetic-fieldinduced metal-insulator transition. 1 Their ternary nature also makes it possible to tune the band parameters and lattice constants by varying the alloy composition. These latter properties makes them attractive candidates for the preparation of superlattices and multiple quantum well structures with molecular beam epitaxy. The successful preparation of superlattices and the consequent extension of the study of DMS to the two-dimensional regime represents one of the most exciting recent developments in the area of DMS and presents a whole new set of challenges and opportunities. [1][2][3][4][5] In this letter we report, what we believe to be, the first successful fabrication and characterization of diluted magnetic semiconductor clusters confined in all three dimensions, i.e. DMS quantum dots. We report detailed preparation procedures and characterization by x-ray diffraction, EXAFS, and photoluminesce spectroscopy. The effects of quantum-confinement on the optical absorption spectra and the magnetic susceptibility have been observed and will be discussed. This study of DMS quantum dots represents part of our continuing program in developing synthetic methodology and fundamental understanding of semiconductor clusters. 6-7We chose Znl_xMnxS as the first system for study. From the previous work on II-VI semiconductor clusters 6'7, it is known that small clusters of this type exist in the zinc blende (sphalerite) structure. This is compatible with the known zinc blende structure of Znl_xMnxS when x <0.1. 8 Similar considerations also suggest that Cd 1_ xMnx S is not a good candidate, at least initially, since it exists in the wurtzite structure for x up to -0.45, and therefore not 33

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confidence: 99%

Three-dimensionally confined diluted magnetic semiconductor clusters: Zn1−xMnxS

Wang

Herron

Möller

et al. 1991

Solid State Communications

157

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“…exchange bias, EB) kommen, bei der die magnetische Hysteresekurve aus einer zum Nullpunkt symmetrischen Position entlang der Magnetfeldachse verschoben vorliegt. Die Multilagensysteme werden für gewöhnlich mithilfe von Methoden der Gasphasenabscheidung wie der Kathodenzerstäubung [38,39] oder der Molekularstrahlepitaxie [40,41] [45]. Dieser Forschungsbeitrag verfolgt das Ziel, das Prinzip der Herstellung magnetischer Kompositschichten durch einen Vergleich mit Bariumferrit-Eisenoxid-Kompositen breiter darzustellen sowie für beide Systeme die gesamte Prozesskette ganzheitlich von der Partikelsynthese bis zur Schichtherstellung und -charakterisierung zu diskutieren.…”

Section: Introductionunclassified

“…exchange bias , EB) kommen, bei der die magnetische Hysteresekurve aus einer zum Nullpunkt symmetrischen Position entlang der Magnetfeldachse verschoben vorliegt. Die Multilagensysteme werden für gewöhnlich mithilfe von Methoden der Gasphasenabscheidung wie der Kathodenzerstäubung , oder der Molekularstrahlepitaxie , erzeugt. Eine vielversprechende Alternative, die eine künftig wesentlich flexiblere und kostengünstige Herstellung erlauben würde, ist die gezielte Kombination vorgefertigter nanopartikulärer Materialien zu magnetischen Nanokomposit‐Schichten.…”

Section: Introductionunclassified

Herstellung von Nanokomposit‐Dünnschichten mit speziellen magnetischen Eigenschaften aus nanopartikulären Bausteinen

Preller

Menzel

Knickmeier

et al. 2020

Chemie Ingenieur Technik

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This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. Die Kombination von Materialien mit unterschiedlichen magnetischen Eigenschaften auf der Nanoskala führt durch Kopplungseffekte zu Phänomenen wie der sogenannten unidirektionalen Austauschanisotropie, die z. B. für Speichermedien oder magnetische Sensoren großes Potenzial besitzt. Während solche Strukturen bislang nur über komplexe Prozesse der alternierenden Abscheidung aus der Gasphase zugänglich sind und daher noch keine breite Anwendung gefunden haben, würde die Herstellung aus Dispersionen von Nanopartikeln nicht nur eine wesentliche Vereinfachung darstellen, sondern auch eine breite Vielfalt von Materialkombinationen und Strukturen ermöglichen. Hierbei stellt die Prozessierung hartmagnetischer Nanopartikel eine Herausforderung dar, die jedoch durch die Verwendung von Vorläufermaterialien mit anschließender Phasenumwandlung gelöst werden kann.

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“…This opened up the field to a large variety of combinations of semiconductors, and also made it possible to take advantage of the influence of strain on the band structure to produce interesting phenomena [34]. The third development had to do with the introduction of special materials to the field of quantum structures, such as the semimagnetic or diluted magnetic semiconductor [35]. The magnetic exchange interaction resulted in significant observations of dimensional crossover of phase transitions and spin polarization and relaxation dynamics [36,37].…”

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confidence: 99%

Road to Quantum Boxes

Chang

1996

Acta Phys. Pol. A

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Quantum wells and superlattices have evolved over the last two decades to become a prominent multi-disciplinary field in condensed matter science. From the first observation of resonant tunneling to the recent realization of the quantum box, in this work we provide a summary description of the historical development of the field, known today as quantum structures. The focus is on the physics aspect with emphasis on important experimental observations that collectively define the field and set its direction of development.PACS numbers: 73.20. Dx, It has been more than two decades since the superlattices and quantum wells were first proposed and realized. This achievement has dramatically changed the landscape of semiconductor research. Indeed, it has opened up a new field in which materials, physics and electronics are pursued in artificially synthesized structures on the scale of atomic dimensions [1]. Quantum states are created with prescribed conflgurations, leading to unprecedented transport, optical and magnetic properties. We show in Table I the multidisciplinary nature of the field, ranging from the preparation and characterization of the structures to the exploration and investigation of new physical phenomena and device applications. Over the years, the field has experienced tremendous expansion and growth and has developed to become a dominant theme in condensed matter science, known today as quantum structures or artificially structured materials or, loosely, nanostructures.The major focus of our interest in quantum structures has been on their physics aspects. This focus will remain in this work as we attempt to look back and give a brief account of its historical development. In Table II some of the important events are shown in chronological order with emphasis on experimental observations. The list is no doubt incomplete in view of the vast, worldwide effort in this field of research and the very large number of reports in the literature. In this table a few items in the development of electronic and optoelectronic devices are also included.In the early 1970's, amid an environment of Skepticism, we started our experimental effort to fabricate ultrathin semiconductor layers in pursuance of the quantum size effect. Guided by the theoretical prediction of a negative-resistance [2], (603)

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Cd1−xMnxTe-CdTe multilayers grown by molecular beam epitaxy

Cited by 129 publications

References 13 publications

Three-dimensionally confined diluted magnetic semiconductor clusters: Zn1−xMnxS

Three-dimensionally confined diluted magnetic semiconductor clusters: Zn1−xMnxS

Herstellung von Nanokomposit‐Dünnschichten mit speziellen magnetischen Eigenschaften aus nanopartikulären Bausteinen

Road to Quantum Boxes

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