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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 (2022):
Magnetotransport Properties of Ferromagnetic Nanoparticles in a Semiconductor Matrix Studied by Precise Size-Selective Cluster Ion Beam Deposition. (Publisher's Version)
In: Nanomaterials, 10 (11), MDPI, e-ISSN 2079-4991,
DOI: 10.26083/tuprints-00017460,
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Item Type: Article
Origin: Secondary publication DeepGreen
Status: Publisher's Version
Title: Magnetotransport Properties of Ferromagnetic Nanoparticles in a Semiconductor Matrix Studied by Precise Size-Selective Cluster Ion Beam Deposition
Language: English
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. The nanocomposites’ resistivity and the observed tunneling magnetoresistance depend exponentially on the average distance between cluster surfaces. On the contrary, there is no notable influence of the cluster size on the tunneling magnetoresistance.

Journal or Publication Title: Nanomaterials
Volume of the journal: 10
Issue Number: 11
Publisher: MDPI
Collation: 27 Seiten
Uncontrolled Keywords: amorphous, germanium, semiconductor, iron, clusters, nanoparticles, nanocomposite, co-deposition, magnetoresistance, tunneling
Classification DDC: 500 Naturwissenschaften und Mathematik > 540 Chemie
Divisions: 11 Department of Materials and Earth Sciences > Material Science
Date Deposited: 09 Feb 2022 14:45
Last Modified: 02 May 2022 12:07
DOI: 10.26083/tuprints-00017460
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-174605
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/17460
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