Thermal hysteresis in the structural, magnetic and transport properties of hard magnetic MnBi films

In this work, the magnetic and transport properties associated with structural changes in MnBi hard magnetic films, with different Bi concentrations, were detailed. Two particular temperature regimes were studied. In the first place, at temperatures close to and below 260 °C (melting temperature of...

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Autores: Vergara Platero, José, Favieres Ruiz, Cristina, Madurga Pérez, Vicente
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2024
País:España
Institución:Universidad Pública de Navarra
Repositorio:Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
OAI Identifier:oai:academica-e.unavarra.es:2454/52553
Acceso en línea:https://hdl.handle.net/2454/52553
Access Level:acceso abierto
Palabra clave:Hard magnetic MnBi films
Phase transitions
Resistance measurements
Thermal hysteresis
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spelling Thermal hysteresis in the structural, magnetic and transport properties of hard magnetic MnBi filmsVergara Platero, JoséFavieres Ruiz, CristinaMadurga Pérez, VicenteHard magnetic MnBi filmsPhase transitionsResistance measurementsThermal hysteresisIn this work, the magnetic and transport properties associated with structural changes in MnBi hard magnetic films, with different Bi concentrations, were detailed. Two particular temperature regimes were studied. In the first place, at temperatures close to and below 260 °C (melting temperature of Bi in the samples) the resistance of the MnBi films underwent strong changes, showing thermal hysteresis, and depending on the amount of Bi in the samples. Thus, these resistance changes were attributed to the presence of unalloyed Bi in the samples. The maximum value of the relative change of resistance, ΔRI/R(T2) (where ΔRI=R(T1)-R(T2) being T1 and T2 the temperatures just immediately below and above the structural transition) was around 180 % for the sample with the highest Bi concentration. Second, at temperatures above 260 °C, both the magnetic moment and the resistance of the samples also showed significant changes around the transition from the Low Temperature (α-MnBi) to the High Temperature (β-MnBi) phase. These changes, which were attributed to this structural transition, also presented thermal hysteresis and also depended on the Bi concentration of the samples. However, contrary to the previous situation, the samples with the lowest amount of unalloyed Bi, and consequently with the highest value of the MnBi volume fraction presented a maximum value of the ΔRII/R(T4) ratio, (where ΔRII=R(T3)-R(T4) being T3 and T4 the temperatures immediately above and below the structural transition from the β to the α MnBi phase) this magnitude reaching a maximum value of 25 % for the sample with the lowest Bi content.Open Access funding by Universidad Pública de Navarra.ElsevierCienciasZientziakInstitute for Advanced Materials and Mathematics - INAMAT2Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa2024info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2454/52553reponame:Academica-e. Repositorio Institucional de la Universidad Pública de Navarrainstname:Universidad Pública de NavarraInglés© 2024 The Author(s). This is an open access article under the CC BY-NC-ND license.https://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:academica-e.unavarra.es:2454/525532026-06-17T12:41:47Z
dc.title.none.fl_str_mv Thermal hysteresis in the structural, magnetic and transport properties of hard magnetic MnBi films
title Thermal hysteresis in the structural, magnetic and transport properties of hard magnetic MnBi films
spellingShingle Thermal hysteresis in the structural, magnetic and transport properties of hard magnetic MnBi films
Vergara Platero, José
Hard magnetic MnBi films
Phase transitions
Resistance measurements
Thermal hysteresis
title_short Thermal hysteresis in the structural, magnetic and transport properties of hard magnetic MnBi films
title_full Thermal hysteresis in the structural, magnetic and transport properties of hard magnetic MnBi films
title_fullStr Thermal hysteresis in the structural, magnetic and transport properties of hard magnetic MnBi films
title_full_unstemmed Thermal hysteresis in the structural, magnetic and transport properties of hard magnetic MnBi films
title_sort Thermal hysteresis in the structural, magnetic and transport properties of hard magnetic MnBi films
dc.creator.none.fl_str_mv Vergara Platero, José
Favieres Ruiz, Cristina
Madurga Pérez, Vicente
author Vergara Platero, José
author_facet Vergara Platero, José
Favieres Ruiz, Cristina
Madurga Pérez, Vicente
author_role author
author2 Favieres Ruiz, Cristina
Madurga Pérez, Vicente
author2_role author
author
dc.contributor.none.fl_str_mv Ciencias
Zientziak
Institute for Advanced Materials and Mathematics - INAMAT2
Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa
dc.subject.none.fl_str_mv Hard magnetic MnBi films
Phase transitions
Resistance measurements
Thermal hysteresis
topic Hard magnetic MnBi films
Phase transitions
Resistance measurements
Thermal hysteresis
description In this work, the magnetic and transport properties associated with structural changes in MnBi hard magnetic films, with different Bi concentrations, were detailed. Two particular temperature regimes were studied. In the first place, at temperatures close to and below 260 °C (melting temperature of Bi in the samples) the resistance of the MnBi films underwent strong changes, showing thermal hysteresis, and depending on the amount of Bi in the samples. Thus, these resistance changes were attributed to the presence of unalloyed Bi in the samples. The maximum value of the relative change of resistance, ΔRI/R(T2) (where ΔRI=R(T1)-R(T2) being T1 and T2 the temperatures just immediately below and above the structural transition) was around 180 % for the sample with the highest Bi concentration. Second, at temperatures above 260 °C, both the magnetic moment and the resistance of the samples also showed significant changes around the transition from the Low Temperature (α-MnBi) to the High Temperature (β-MnBi) phase. These changes, which were attributed to this structural transition, also presented thermal hysteresis and also depended on the Bi concentration of the samples. However, contrary to the previous situation, the samples with the lowest amount of unalloyed Bi, and consequently with the highest value of the MnBi volume fraction presented a maximum value of the ΔRII/R(T4) ratio, (where ΔRII=R(T3)-R(T4) being T3 and T4 the temperatures immediately above and below the structural transition from the β to the α MnBi phase) this magnitude reaching a maximum value of 25 % for the sample with the lowest Bi content.
publishDate 2024
dc.date.none.fl_str_mv 2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2454/52553
url https://hdl.handle.net/2454/52553
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv © 2024 The Author(s). This is an open access article under the CC BY-NC-ND license.
https://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv © 2024 The Author(s). This is an open access article under the CC BY-NC-ND license.
https://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
instname:Universidad Pública de Navarra
instname_str Universidad Pública de Navarra
reponame_str Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
collection Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
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