Thermal Stability, Blocking Regime and Superparamagnetic Behavior in Mn-Al-C Melt Spun Ribbons

Alloys possessing nominal compositions Mn53Al45C2 and Mn52Al46C2 were prepared by the melt spinning method and were subjected to complex structural, morphological...

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Autores principales:	Alina Daniela Crisan, Aurel Leca, Ioan Dan, Ovidiu Crisan
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	MnAl systems ε–τ phase transformation magnetic properties magnetic transitions Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/2bceabaa42064ee9b39ddd8a5a26281e
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spelling	oai:doaj.org-article:2bceabaa42064ee9b39ddd8a5a26281e2021-11-25T18:30:41ZThermal Stability, Blocking Regime and Superparamagnetic Behavior in Mn-Al-C Melt Spun Ribbons10.3390/nano111128982079-4991https://doaj.org/article/2bceabaa42064ee9b39ddd8a5a26281e2021-10-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/2898https://doaj.org/toc/2079-4991Alloys possessing nominal compositions Mn<sub>53</sub>Al<sub>45</sub>C<sub>2</sub> and Mn<sub>52</sub>Al<sub>46</sub>C<sub>2</sub> were prepared by the melt spinning method and were subjected to complex structural, morphological and magnetic investigations. As these alloys can exhibit tetragonal L1<sub>0</sub>-type and τ phase, they have good potential as rare earth (RE)—free magnets. It is, therefore, important to monitor the ε–τ phase transformation and the stability and the magnetic features of the tetragonal phase in an entire temperature interval. By using synchrotron X-ray diffraction, it has been proven that the ε–τ phase transformation occurs gradually, with the τ phase becoming predominant only after 450 °C. Moreover, this phase has been proven to be quite stable without any grain growth even at the highest temperature investigated at 800 °C. Low temperature behavior was thoroughly investigated by using a complex combination of major and minor hysteresis loops combined with the zero field cooled-field cooled magnetization protocols (ZFC-FC). Two different regimes, blocking and superparamagnetic, were documented. A spin reorientation transition was proven to occur at 55 K while a maximum magnetization observed in ZFC-FC curves proved that at about 75 K, a transition from ferro to superparamagnetic state occurs. The existence of a blocking regime below 55 K that is characteristic to nanogranular systems with superparamagnetic behavior has shown further development towards obtaining RE-free magnets.Alina Daniela CrisanAurel LecaIoan DanOvidiu CrisanMDPI AGarticleMnAl systemsε–τ phase transformationmagnetic propertiesmagnetic transitionsChemistryQD1-999ENNanomaterials, Vol 11, Iss 2898, p 2898 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	MnAl systems ε–τ phase transformation magnetic properties magnetic transitions Chemistry QD1-999
spellingShingle	MnAl systems ε–τ phase transformation magnetic properties magnetic transitions Chemistry QD1-999 Alina Daniela Crisan Aurel Leca Ioan Dan Ovidiu Crisan Thermal Stability, Blocking Regime and Superparamagnetic Behavior in Mn-Al-C Melt Spun Ribbons
description	Alloys possessing nominal compositions Mn<sub>53</sub>Al<sub>45</sub>C<sub>2</sub> and Mn<sub>52</sub>Al<sub>46</sub>C<sub>2</sub> were prepared by the melt spinning method and were subjected to complex structural, morphological and magnetic investigations. As these alloys can exhibit tetragonal L1<sub>0</sub>-type and τ phase, they have good potential as rare earth (RE)—free magnets. It is, therefore, important to monitor the ε–τ phase transformation and the stability and the magnetic features of the tetragonal phase in an entire temperature interval. By using synchrotron X-ray diffraction, it has been proven that the ε–τ phase transformation occurs gradually, with the τ phase becoming predominant only after 450 °C. Moreover, this phase has been proven to be quite stable without any grain growth even at the highest temperature investigated at 800 °C. Low temperature behavior was thoroughly investigated by using a complex combination of major and minor hysteresis loops combined with the zero field cooled-field cooled magnetization protocols (ZFC-FC). Two different regimes, blocking and superparamagnetic, were documented. A spin reorientation transition was proven to occur at 55 K while a maximum magnetization observed in ZFC-FC curves proved that at about 75 K, a transition from ferro to superparamagnetic state occurs. The existence of a blocking regime below 55 K that is characteristic to nanogranular systems with superparamagnetic behavior has shown further development towards obtaining RE-free magnets.
format	article
author	Alina Daniela Crisan Aurel Leca Ioan Dan Ovidiu Crisan
author_facet	Alina Daniela Crisan Aurel Leca Ioan Dan Ovidiu Crisan
author_sort	Alina Daniela Crisan
title	Thermal Stability, Blocking Regime and Superparamagnetic Behavior in Mn-Al-C Melt Spun Ribbons
title_short	Thermal Stability, Blocking Regime and Superparamagnetic Behavior in Mn-Al-C Melt Spun Ribbons
title_full	Thermal Stability, Blocking Regime and Superparamagnetic Behavior in Mn-Al-C Melt Spun Ribbons
title_fullStr	Thermal Stability, Blocking Regime and Superparamagnetic Behavior in Mn-Al-C Melt Spun Ribbons
title_full_unstemmed	Thermal Stability, Blocking Regime and Superparamagnetic Behavior in Mn-Al-C Melt Spun Ribbons
title_sort	thermal stability, blocking regime and superparamagnetic behavior in mn-al-c melt spun ribbons
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/2bceabaa42064ee9b39ddd8a5a26281e
work_keys_str_mv	AT alinadanielacrisan thermalstabilityblockingregimeandsuperparamagneticbehaviorinmnalcmeltspunribbons AT aurelleca thermalstabilityblockingregimeandsuperparamagneticbehaviorinmnalcmeltspunribbons AT ioandan thermalstabilityblockingregimeandsuperparamagneticbehaviorinmnalcmeltspunribbons AT ovidiucrisan thermalstabilityblockingregimeandsuperparamagneticbehaviorinmnalcmeltspunribbons
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Thermal Stability, Blocking Regime and Superparamagnetic Behavior in Mn-Al-C Melt Spun Ribbons

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