Disorder effect on the magnetic behavior of mechanically alloyed Fe1-x Alx (0.2≤x≤0.4)
We report on the magnetic properties of Fe1-x Alx alloys (0.2≤x≤0.4) produced by mechanical alloying by milling pure element powders for t=12, 24, and 36 h. The alloys present a bcc lattice with compositional disorder and are ferromagnetic at room temperature, independently of the milling time. The...
| Autores: | , , , , , , , , |
|---|---|
| Formato: | artículo |
| Fecha de publicación: | 2009 |
| País: | España |
| Recursos: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/100722 |
| Acesso em linha: | http://hdl.handle.net/10261/100722 |
| Access Level: | acceso abierto |
| Palavra-chave: | Superparamagnetism Spin glasses Mossbauer effect Mechanical alloying Magnetic susceptibility Aluminium alloys Antiferromagnetism Crystal structures Ferromagnetism Freezing Iron alloys Lattice constants Localised modes Magnetic hysteresis |
| id |
ES_5422b6285196490640c19bfe8672d9e3 |
|---|---|
| oai_identifier_str |
oai:digital.csic.es:10261/100722 |
| network_acronym_str |
ES |
| network_name_str |
España |
| repository_id_str |
|
| spelling |
Disorder effect on the magnetic behavior of mechanically alloyed Fe1-x Alx (0.2≤x≤0.4)Zamora Alfonso, Ligia EdithPérez Alcázar, G. A.Vélez, G. Y.Betancur, JulioMarco, J.F.Romero, J. J.Martínez, A.Palomares, F. JavierGonzález Fernández, Jesús MaríaSuperparamagnetismSpin glassesMossbauer effectMechanical alloyingMagnetic susceptibilityAluminium alloysAntiferromagnetismCrystal structuresFerromagnetismFreezingIron alloysLattice constantsLocalised modesMagnetic hysteresisWe report on the magnetic properties of Fe1-x Alx alloys (0.2≤x≤0.4) produced by mechanical alloying by milling pure element powders for t=12, 24, and 36 h. The alloys present a bcc lattice with compositional disorder and are ferromagnetic at room temperature, independently of the milling time. The lattice parameter of the x=0.2 sample presents a small decrease with t, whereas those of the x=0.3 and 0.4 samples remain constant independently of the milling time. The magnetic properties of the alloys with x=0.2 and 0.3 do not show important variations with t, while those of x=0.4 are strongly dependent on the milling time. For this latter alloy it was found that: (i) despite being the most diluted of the series, it presents a well developed ferromagnetic order at room temperature as the Mössbauer and hysteretic data have shown; (ii) the temperature dependence of the ac susceptibility and the Mössbauer spectra recorded at different temperatures evidence the occurrence of reentrant spin-glass and superparamagnetic phenomena. The enhancement of the ferromagnetic behavior and the presence of reentrant spin-glass freezing temperature and of a superparamagnetic blocking process are interpreted in terms of a simple localized model based on the disorder present in that alloy and on the occurrence of competitive interactions, namely, the ferromagnetic nearest-neighbor Fe-Fe interactions and the antiferromagnetic near-nearest-neighbor Fe-Fe ones. Taken together, these results evidence that the stabilization of the magnetic order takes place in the x=0.4 sample exclusively through the induction of compositional disorder and without any contribution from the lattice expansion. © 2009 The American Physical Society.The authors would like to thank the financial support given to this work by Colciencias-CNPq and Colciencias-CSIC (Colombian, Brazilian, and Spanish agencies) across provided by the Spanish Science Ministery and the Universidad del Valle. Financial support from the Comunidad Autónoma de Madrid through Project No. S-0505/MAT/0194 is also gratefully acknowledged. Special thanks are given to J.A. Plascak from UFMG, Brazil, for helpfully reading the paper and for his suggestions. collaboration projects. G.A.P.A., the Sabbatical Year GrantPeer ReviewedAmerican Institute of PhysicsColciencias (Colombia)Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil)Consejo Superior de Investigaciones Científicas (España)Ministerio de Ciencia y Tecnología (España)Comunidad de MadridUniversidad del Valle (Colombia)2014201420092014info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/100722reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglésinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1007222026-05-22T06:33:51Z |
| dc.title.none.fl_str_mv |
Disorder effect on the magnetic behavior of mechanically alloyed Fe1-x Alx (0.2≤x≤0.4) |
| title |
Disorder effect on the magnetic behavior of mechanically alloyed Fe1-x Alx (0.2≤x≤0.4) |
| spellingShingle |
Disorder effect on the magnetic behavior of mechanically alloyed Fe1-x Alx (0.2≤x≤0.4) Zamora Alfonso, Ligia Edith Superparamagnetism Spin glasses Mossbauer effect Mechanical alloying Magnetic susceptibility Aluminium alloys Antiferromagnetism Crystal structures Ferromagnetism Freezing Iron alloys Lattice constants Localised modes Magnetic hysteresis |
| title_short |
Disorder effect on the magnetic behavior of mechanically alloyed Fe1-x Alx (0.2≤x≤0.4) |
| title_full |
Disorder effect on the magnetic behavior of mechanically alloyed Fe1-x Alx (0.2≤x≤0.4) |
| title_fullStr |
Disorder effect on the magnetic behavior of mechanically alloyed Fe1-x Alx (0.2≤x≤0.4) |
| title_full_unstemmed |
Disorder effect on the magnetic behavior of mechanically alloyed Fe1-x Alx (0.2≤x≤0.4) |
| title_sort |
Disorder effect on the magnetic behavior of mechanically alloyed Fe1-x Alx (0.2≤x≤0.4) |
| dc.creator.none.fl_str_mv |
Zamora Alfonso, Ligia Edith Pérez Alcázar, G. A. Vélez, G. Y. Betancur, Julio Marco, J.F. Romero, J. J. Martínez, A. Palomares, F. Javier González Fernández, Jesús María |
| author |
Zamora Alfonso, Ligia Edith |
| author_facet |
Zamora Alfonso, Ligia Edith Pérez Alcázar, G. A. Vélez, G. Y. Betancur, Julio Marco, J.F. Romero, J. J. Martínez, A. Palomares, F. Javier González Fernández, Jesús María |
| author_role |
author |
| author2 |
Pérez Alcázar, G. A. Vélez, G. Y. Betancur, Julio Marco, J.F. Romero, J. J. Martínez, A. Palomares, F. Javier González Fernández, Jesús María |
| author2_role |
author author author author author author author author |
| dc.contributor.none.fl_str_mv |
Colciencias (Colombia) Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil) Consejo Superior de Investigaciones Científicas (España) Ministerio de Ciencia y Tecnología (España) Comunidad de Madrid Universidad del Valle (Colombia) |
| dc.subject.none.fl_str_mv |
Superparamagnetism Spin glasses Mossbauer effect Mechanical alloying Magnetic susceptibility Aluminium alloys Antiferromagnetism Crystal structures Ferromagnetism Freezing Iron alloys Lattice constants Localised modes Magnetic hysteresis |
| topic |
Superparamagnetism Spin glasses Mossbauer effect Mechanical alloying Magnetic susceptibility Aluminium alloys Antiferromagnetism Crystal structures Ferromagnetism Freezing Iron alloys Lattice constants Localised modes Magnetic hysteresis |
| description |
We report on the magnetic properties of Fe1-x Alx alloys (0.2≤x≤0.4) produced by mechanical alloying by milling pure element powders for t=12, 24, and 36 h. The alloys present a bcc lattice with compositional disorder and are ferromagnetic at room temperature, independently of the milling time. The lattice parameter of the x=0.2 sample presents a small decrease with t, whereas those of the x=0.3 and 0.4 samples remain constant independently of the milling time. The magnetic properties of the alloys with x=0.2 and 0.3 do not show important variations with t, while those of x=0.4 are strongly dependent on the milling time. For this latter alloy it was found that: (i) despite being the most diluted of the series, it presents a well developed ferromagnetic order at room temperature as the Mössbauer and hysteretic data have shown; (ii) the temperature dependence of the ac susceptibility and the Mössbauer spectra recorded at different temperatures evidence the occurrence of reentrant spin-glass and superparamagnetic phenomena. The enhancement of the ferromagnetic behavior and the presence of reentrant spin-glass freezing temperature and of a superparamagnetic blocking process are interpreted in terms of a simple localized model based on the disorder present in that alloy and on the occurrence of competitive interactions, namely, the ferromagnetic nearest-neighbor Fe-Fe interactions and the antiferromagnetic near-nearest-neighbor Fe-Fe ones. Taken together, these results evidence that the stabilization of the magnetic order takes place in the x=0.4 sample exclusively through the induction of compositional disorder and without any contribution from the lattice expansion. © 2009 The American Physical Society. |
| publishDate |
2009 |
| dc.date.none.fl_str_mv |
2009 2014 2014 2014 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article http://purl.org/coar/resource_type/c_6501 |
| format |
article |
| dc.identifier.none.fl_str_mv |
http://hdl.handle.net/10261/100722 |
| url |
http://hdl.handle.net/10261/100722 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess |
| eu_rights_str_mv |
openAccess |
| dc.publisher.none.fl_str_mv |
American Institute of Physics |
| publisher.none.fl_str_mv |
American Institute of Physics |
| dc.source.none.fl_str_mv |
reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC instname:Consejo Superior de Investigaciones Científicas (CSIC) |
| instname_str |
Consejo Superior de Investigaciones Científicas (CSIC) |
| reponame_str |
DIGITAL.CSIC. Repositorio Institucional del CSIC |
| collection |
DIGITAL.CSIC. Repositorio Institucional del CSIC |
| repository.name.fl_str_mv |
|
| repository.mail.fl_str_mv |
|
| _version_ |
1869408164296785920 |
| score |
15,198674 |