Effect of the Substrate Crystallinity on Morphological and Magnetic Properties of Fe<sub>70</sub>Pd<sub>30</sub> Nanoparticles Obtained by the Solid-State Dewetting

Advances in nanofabrication techniques are undoubtedly needed to obtain nanostructured magnetic materials with physical and chemical properties matching the pressing and relentless technological demands of sensors. Solid-state dewetting is known to be a low-cost and “top-down” nanofabrication techni...

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Autores principales:	Gabriele Barrera, Federica Celegato, Matteo Cialone, Marco Coïsson, Paola Rizzi, Paola Tiberto
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	FePd thin film solid-state dewetting substrate crystallinity magnetic nanoparticles Chemical technology TP1-1185
Acceso en línea:	https://doaj.org/article/1252dc0840e34e01a593af0b35fb78d2
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spelling	oai:doaj.org-article:1252dc0840e34e01a593af0b35fb78d22021-11-11T19:20:08ZEffect of the Substrate Crystallinity on Morphological and Magnetic Properties of Fe<sub>70</sub>Pd<sub>30</sub> Nanoparticles Obtained by the Solid-State Dewetting10.3390/s212174201424-8220https://doaj.org/article/1252dc0840e34e01a593af0b35fb78d22021-11-01T00:00:00Zhttps://www.mdpi.com/1424-8220/21/21/7420https://doaj.org/toc/1424-8220Advances in nanofabrication techniques are undoubtedly needed to obtain nanostructured magnetic materials with physical and chemical properties matching the pressing and relentless technological demands of sensors. Solid-state dewetting is known to be a low-cost and “top-down” nanofabrication technique able to induce a controlled morphological transformation of a continuous thin film into an ordered nanoparticle array. Here, magnetic Fe<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>70</mn></msub></semantics></math></inline-formula>Pd<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>30</mn></msub></semantics></math></inline-formula> thin film with 30 nm thickness is deposited by the co-sputtering technique on a monocrystalline (MgO) or amorphous (Si<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>3</mn></msub></semantics></math></inline-formula>N<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>4</mn></msub></semantics></math></inline-formula>) substrate and, subsequently, annealed to promote the dewetting process. The different substrate properties are able to tune the activation thermal energy of the dewetting process, which can be tuned by depositing on substrates with different microstructures. In this way, it is possible to tailor the final morphology of FePd nanoparticles as observed by advanced microscopy techniques (SEM and AFM). The average size and height of the nanoparticles are in the ranges 150–300 nm and 150–200 nm, respectively. Moreover, the induced spatial confinement of magnetic materials in almost-spherical nanoparticles strongly affects the magnetic properties as observed by in-plane and out-of-plane hysteresis loops. Magnetization reversal in dewetted FePd nanoparticles is mainly characterized by a rotational mechanism leading to a slower approach to saturation and smaller value of the magnetic susceptibility than the as-deposited thin film.Gabriele BarreraFederica CelegatoMatteo CialoneMarco CoïssonPaola RizziPaola TibertoMDPI AGarticleFePd thin filmsolid-state dewettingsubstrate crystallinitymagnetic nanoparticlesChemical technologyTP1-1185ENSensors, Vol 21, Iss 7420, p 7420 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	FePd thin film solid-state dewetting substrate crystallinity magnetic nanoparticles Chemical technology TP1-1185
spellingShingle	FePd thin film solid-state dewetting substrate crystallinity magnetic nanoparticles Chemical technology TP1-1185 Gabriele Barrera Federica Celegato Matteo Cialone Marco Coïsson Paola Rizzi Paola Tiberto Effect of the Substrate Crystallinity on Morphological and Magnetic Properties of Fe<sub>70</sub>Pd<sub>30</sub> Nanoparticles Obtained by the Solid-State Dewetting
description	Advances in nanofabrication techniques are undoubtedly needed to obtain nanostructured magnetic materials with physical and chemical properties matching the pressing and relentless technological demands of sensors. Solid-state dewetting is known to be a low-cost and “top-down” nanofabrication technique able to induce a controlled morphological transformation of a continuous thin film into an ordered nanoparticle array. Here, magnetic Fe<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>70</mn></msub></semantics></math></inline-formula>Pd<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>30</mn></msub></semantics></math></inline-formula> thin film with 30 nm thickness is deposited by the co-sputtering technique on a monocrystalline (MgO) or amorphous (Si<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>3</mn></msub></semantics></math></inline-formula>N<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>4</mn></msub></semantics></math></inline-formula>) substrate and, subsequently, annealed to promote the dewetting process. The different substrate properties are able to tune the activation thermal energy of the dewetting process, which can be tuned by depositing on substrates with different microstructures. In this way, it is possible to tailor the final morphology of FePd nanoparticles as observed by advanced microscopy techniques (SEM and AFM). The average size and height of the nanoparticles are in the ranges 150–300 nm and 150–200 nm, respectively. Moreover, the induced spatial confinement of magnetic materials in almost-spherical nanoparticles strongly affects the magnetic properties as observed by in-plane and out-of-plane hysteresis loops. Magnetization reversal in dewetted FePd nanoparticles is mainly characterized by a rotational mechanism leading to a slower approach to saturation and smaller value of the magnetic susceptibility than the as-deposited thin film.
format	article
author	Gabriele Barrera Federica Celegato Matteo Cialone Marco Coïsson Paola Rizzi Paola Tiberto
author_facet	Gabriele Barrera Federica Celegato Matteo Cialone Marco Coïsson Paola Rizzi Paola Tiberto
author_sort	Gabriele Barrera
title	Effect of the Substrate Crystallinity on Morphological and Magnetic Properties of Fe<sub>70</sub>Pd<sub>30</sub> Nanoparticles Obtained by the Solid-State Dewetting
title_short	Effect of the Substrate Crystallinity on Morphological and Magnetic Properties of Fe<sub>70</sub>Pd<sub>30</sub> Nanoparticles Obtained by the Solid-State Dewetting
title_full	Effect of the Substrate Crystallinity on Morphological and Magnetic Properties of Fe<sub>70</sub>Pd<sub>30</sub> Nanoparticles Obtained by the Solid-State Dewetting
title_fullStr	Effect of the Substrate Crystallinity on Morphological and Magnetic Properties of Fe<sub>70</sub>Pd<sub>30</sub> Nanoparticles Obtained by the Solid-State Dewetting
title_full_unstemmed	Effect of the Substrate Crystallinity on Morphological and Magnetic Properties of Fe<sub>70</sub>Pd<sub>30</sub> Nanoparticles Obtained by the Solid-State Dewetting
title_sort	effect of the substrate crystallinity on morphological and magnetic properties of fe<sub>70</sub>pd<sub>30</sub> nanoparticles obtained by the solid-state dewetting
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/1252dc0840e34e01a593af0b35fb78d2
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Effect of the Substrate Crystallinity on Morphological and Magnetic Properties of Fe<sub>70</sub>Pd<sub>30</sub> Nanoparticles Obtained by the Solid-State Dewetting

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