Role of Disordered Precursor in L1<sub>0</sub> Phase Formation in FePt-Based Nanocomposite Magnet

In order to prove the usefulness of having a structurally disordered precursor to the formation of FePt L1<sub>0</sub> phase and to facilitate the co-existence of exchange coupled hard and soft magnetic phases with optimized magnetic properties in various conditions of annealing, a Fe-Pt...

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Autores principales:	Alina Daniela Crisan, Ioan Dan, Ovidiu Crisan
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	nanocomposite magnets L1<sub>0</sub> phase Mössbauer spectroscopy magnetic properties Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/410393a0d8cb4668b0b080659100b25f
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spelling	oai:doaj.org-article:410393a0d8cb4668b0b080659100b25f2021-11-25T18:12:32ZRole of Disordered Precursor in L1<sub>0</sub> Phase Formation in FePt-Based Nanocomposite Magnet10.3390/magnetochemistry71101492312-7481https://doaj.org/article/410393a0d8cb4668b0b080659100b25f2021-11-01T00:00:00Zhttps://www.mdpi.com/2312-7481/7/11/149https://doaj.org/toc/2312-7481In order to prove the usefulness of having a structurally disordered precursor to the formation of FePt L1<sub>0</sub> phase and to facilitate the co-existence of exchange coupled hard and soft magnetic phases with optimized magnetic properties in various conditions of annealing, a Fe-Pt-Zr-B melt spun alloy has been synthesized and detailed structural and magnetic investigations have been undertaken to probe its phase evolution during annealing. The dynamics of formation of the hard magnetic L1<sub>0</sub> phase during the gradual disorder–order phase transformation has been monitored by using a complex combination of X-ray diffraction methods and <sup>57</sup>Fe Mössbauer spectroscopy methods, over a wide range of annealing temperatures. Multiple phases co-existing in the annealed sample microstructures, observed in XRD, have been reconfirmed by the Mössbauer spectra analysis and, moreover, accurate quantitative data have been acquired in what concerns the relative abundance of each of the observed crystalline phases in every stage of annealing. It is shown that the formation of the hard magnetic phase, emerging from the chemically disordered precursor, is gradual and occurs via complex mechanisms, involving the presence of a disordered Fe-Zr-B-rich intergranular region which contributes to an increase in the abundance of the L1<sub>0</sub> phase for higher annealing temperatures. Magnetic measurements have confirmed the good performances of these alloys in terms of coercivity and remanence. These results contribute to the development of these alloys as the next generation of rare earth, free permanent magnets.Alina Daniela CrisanIoan DanOvidiu CrisanMDPI AGarticlenanocomposite magnetsL1<sub>0</sub> phaseMössbauer spectroscopymagnetic propertiesChemistryQD1-999ENMagnetochemistry, Vol 7, Iss 149, p 149 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	nanocomposite magnets L1<sub>0</sub> phase Mössbauer spectroscopy magnetic properties Chemistry QD1-999
spellingShingle	nanocomposite magnets L1<sub>0</sub> phase Mössbauer spectroscopy magnetic properties Chemistry QD1-999 Alina Daniela Crisan Ioan Dan Ovidiu Crisan Role of Disordered Precursor in L1<sub>0</sub> Phase Formation in FePt-Based Nanocomposite Magnet
description	In order to prove the usefulness of having a structurally disordered precursor to the formation of FePt L1<sub>0</sub> phase and to facilitate the co-existence of exchange coupled hard and soft magnetic phases with optimized magnetic properties in various conditions of annealing, a Fe-Pt-Zr-B melt spun alloy has been synthesized and detailed structural and magnetic investigations have been undertaken to probe its phase evolution during annealing. The dynamics of formation of the hard magnetic L1<sub>0</sub> phase during the gradual disorder–order phase transformation has been monitored by using a complex combination of X-ray diffraction methods and <sup>57</sup>Fe Mössbauer spectroscopy methods, over a wide range of annealing temperatures. Multiple phases co-existing in the annealed sample microstructures, observed in XRD, have been reconfirmed by the Mössbauer spectra analysis and, moreover, accurate quantitative data have been acquired in what concerns the relative abundance of each of the observed crystalline phases in every stage of annealing. It is shown that the formation of the hard magnetic phase, emerging from the chemically disordered precursor, is gradual and occurs via complex mechanisms, involving the presence of a disordered Fe-Zr-B-rich intergranular region which contributes to an increase in the abundance of the L1<sub>0</sub> phase for higher annealing temperatures. Magnetic measurements have confirmed the good performances of these alloys in terms of coercivity and remanence. These results contribute to the development of these alloys as the next generation of rare earth, free permanent magnets.
format	article
author	Alina Daniela Crisan Ioan Dan Ovidiu Crisan
author_facet	Alina Daniela Crisan Ioan Dan Ovidiu Crisan
author_sort	Alina Daniela Crisan
title	Role of Disordered Precursor in L1<sub>0</sub> Phase Formation in FePt-Based Nanocomposite Magnet
title_short	Role of Disordered Precursor in L1<sub>0</sub> Phase Formation in FePt-Based Nanocomposite Magnet
title_full	Role of Disordered Precursor in L1<sub>0</sub> Phase Formation in FePt-Based Nanocomposite Magnet
title_fullStr	Role of Disordered Precursor in L1<sub>0</sub> Phase Formation in FePt-Based Nanocomposite Magnet
title_full_unstemmed	Role of Disordered Precursor in L1<sub>0</sub> Phase Formation in FePt-Based Nanocomposite Magnet
title_sort	role of disordered precursor in l1<sub>0</sub> phase formation in fept-based nanocomposite magnet
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/410393a0d8cb4668b0b080659100b25f
work_keys_str_mv	AT alinadanielacrisan roleofdisorderedprecursorinl1sub0subphaseformationinfeptbasednanocompositemagnet AT ioandan roleofdisorderedprecursorinl1sub0subphaseformationinfeptbasednanocompositemagnet AT ovidiucrisan roleofdisorderedprecursorinl1sub0subphaseformationinfeptbasednanocompositemagnet
_version_	1718411494129926144

Role of Disordered Precursor in L1<sub>0</sub> Phase Formation in FePt-Based Nanocomposite Magnet

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