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Hybrid nanoelectronic-magnetic device with magnetoresistive core–shell Fe/FeC nanoparticles

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Abstract

We propose a concept of hybrid nanoelectronic-magnetic device made of magnetic Fe–C core–shell nanoparticles deposited onto prepatterned Si (111) substrate with basic circuitry made of metallic conductive lines. The synthesis of magnetic material and the creation of nanoelectronic prepatterned interdigitated die are reported and to prove the effectiveness in devices, their magnetotransport properties are investigated. Magnetic Fe/FeC nanoparticles, 11 nm diameter, with a core–shell structure have been prepared by laser pyrolysis. Two different layouts of prepatterned interdigitated die, have been conceived using e-beam lithography, with various geometries. A range of microscopy techniques, transmission electron, scanning and optical, were employed for morphological characterization of the as-obtained structures. Magnetic and magnetotransport characterization using SQUID magnetometry has been performed onto both the core–shell nanoparticles and onto the hybrid device obtained by depositing centrifugated and dispersed core–shell nanoparticles from liquid carrier solutions. From magnetotransport measurements, it has been revealed that the hybrid device made of Fe/FeC nanosized materials on prepatterned interdigitated die exhibit a large giant magnetoresistive (GMR) effect of about 8% at 300 K. This result is promising in view of the use of such devices as arrays of nanosensors and in spintronic applications.

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Acknowledgements

This research was supported from EU Competitiveness Operational Programme projects POC P_40_296 “Materiale multifuncționale inteligente pentru aplicații de înaltă tehnologie” (MATI2IT) and POC P_37_697 “Boron- and rare-earths-based advanced functional materials” funded through the Romanian Ministry of European Funds as well as from Core Program PN21N–Ministry of Education and Research and PN-III-P1-1.2-PCCDI-2017-0871-UEFISCDI.

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Authors and Affiliations

  1. National Institute for Materials Physics, PO Box MG-7, 077125, Magurele, Romania

    O. Crisan & A. D. Crisan

  2. National Institute for Laser, Plasma and Radiation Physics, 077125, Magurele, Romania

    F. Dumitrache & C. Luculescu

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  1. O. Crisan
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  2. A. D. Crisan
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  3. F. Dumitrache
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  4. C. Luculescu
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Crisan, O., Crisan, A.D., Dumitrache, F. et al. Hybrid nanoelectronic-magnetic device with magnetoresistive core–shell Fe/FeC nanoparticles. Appl. Phys. A 126, 200 (2020). https://doi.org/10.1007/s00339-020-3378-y

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