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Magnetotransport Properties of Ferromagnetic Nanoparticles in a Semiconductor Matrix Studied by Precise Size-Selective Cluster Ion Beam Deposition

Gack, Nicolas; Iankevich, Gleb; Benel, Cahit; Kruk, Robert; Wang, Di; Hahn, Horst; Reisinger, Thomas

Abstract:
The combination of magnetic and semiconducting properties in one material system has great potential for integration of emerging spintronics with conventional semiconductor technology. One standard route for the synthesis of magnetic semiconductors is doping of semiconductors with magnetic atoms. In many semiconductor–magnetic–dopant systems, the magnetic atoms form precipitates within the semiconducting matrix. An alternative and controlled way to realize such nanocomposite materials is the assembly by co-deposition of size-selected cluster ions and a semiconductor. Here we follow the latter approach to demonstrate that this fabrication route can be used to independently study the influence of cluster concentration and cluster size on magneto-transport properties. In this case we study Fe clusters composed of approximately 500 or 1000 atoms soft-landed into a thermally evaporated amorphous Ge matrix. The analysis of field and temperature dependent transport shows that tunneling processes affected by Coulomb blockade dominate at low temperatures. The nanocomposites show saturating tunneling magnetoresistance, additionally superimposed by at least one other effect not saturating upon the maximum applied field of 6 T. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000126388
Veröffentlicht am 19.11.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Institut für Quantenmaterialien und -technologien (IQMT)
Karlsruhe Nano Micro Facility (KNMF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2079-4991
KITopen-ID: 1000126388
HGF-Programm 43.22.01 (POF III, LK 01) Functionality by Design
Erschienen in Nanomaterials
Band 10
Heft 11
Seiten Article: 2192
Vorab online veröffentlicht am 03.11.2020
Schlagwörter amorphous; germanium; semiconductor; iron; clusters; nanoparticles; nanocomposite; co-deposition; magnetoresistance; tunneling
Nachgewiesen in Scopus
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