Structural, magnetic, and electronic properties of high moment FeCo nanoparticles
Identifieur interne : 000014 ( Maroc/Analysis ); précédent : 000013; suivant : 000015Structural, magnetic, and electronic properties of high moment FeCo nanoparticles
Auteurs : K. Zehani [France] ; R. Bez [France, Tunisie] ; A. Boutahar [Maroc] ; E. K. Hlil [France] ; H. Lassri [Maroc] ; J. Moscovici [France] ; N. Mliki [Tunisie] ; L. Bessais [France]Source :
- Journal of alloys and compounds [ 0925-8388 ] ; 2014.
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Abstract
Soft-magnetic Fe55Co45 alloy nanoparticles have been successfully synthesized by the polyol reduction process followed by annealing under argon. The diethylene glycol (DEG) was used as solvent and reducing agent simultaneously in this process. The synthesized samples of nanoparticles were annealed at 873 K for different times. The alloy formation processes, the evolution of the microstructure, the magnetic properties, and the DOS calculation have been investigated before and after samples annealing. The X-ray diffraction of the synthesized product before annealing shows that a cobalt ferrite is spinel structure of crystallite size of about 10 nm. X-ray diffraction analysis of the samples annealed at 873 K for different times also shows that of the FeCo alloy has been obtained by reducing the cobalt ferrite. It has been confirmed the formation of a body-centered-cubic (bcc) single phase structure where the wt.% increases with annealing times leading to a pure phase after annealing during 4 h. These results are confirmed by transmission electron microscopy study. The saturation magnetization of the Fe-Co alloys increases with annealing time, indicating an increasing homogeneity in composition and the single bcc FeCo phase formation. The highest saturation magnetization of 235 emu g-1with a low coercivity of 76 Oe was obtained for the Fe55Co45nanoparticles annealed during 4 h. The local random anisotropy constant KL has been extracted. This work presents also detailed information about total, and atom projected density of state functions, as well as the magnetic moment for different atoms in Fe55Co45 alloys and cobalt ferrite.
Affiliations:
- France, Maroc, Tunisie
- Auvergne-Rhône-Alpes, Gouvernorat de Tunis, Rhône-Alpes, Île-de-France
- Grenoble, Thiais, Tunis
- Université Joseph Fourier, Université de Tunis - El Manar
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Pascal:14-0168622Le document en format XML
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Zehani</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>CMTR, ICMPE, UMR7182, CNRS - Université Paris Est Créteil, 2-8 rue Henri Dunant</s1><s2>94320 Thiais</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>6 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Île-de-France</region><settlement type="city">Thiais</settlement></placeName></affiliation></author><author><name sortKey="Bez, R" sort="Bez, R" uniqKey="Bez R" first="R." last="Bez">R. Bez</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>CMTR, ICMPE, UMR7182, CNRS - Université Paris Est Créteil, 2-8 rue Henri Dunant</s1><s2>94320 Thiais</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>6 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Île-de-France</region><settlement type="city">Thiais</settlement></placeName></affiliation><affiliation wicri:level="4"><inist:fA14 i1="03"><s1>LMOP, Faculté des Sciences de Tunis, Université de Tunis El Manar</s1><s2>2092 Tunis</s2><s3>TUN</s3><sZ>2 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country>Tunisie</country><placeName><settlement type="city">Tunis</settlement><region nuts="2">Gouvernorat de Tunis</region></placeName><orgName type="university">Université de Tunis - El Manar</orgName><placeName><settlement type="city">Tunis</settlement><region type="region" nuts="2">Gouvernorat de Tunis</region></placeName></affiliation></author><author><name sortKey="Boutahar, A" sort="Boutahar, A" uniqKey="Boutahar A" first="A." last="Boutahar">A. Boutahar</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>LPMMAT, Université Hassan II, Faculté des Sciences Ain Chock, B.P.5366 Maârif, Route d'El Jadida, km-8</s1><s2>Casablanca</s2><s3>MAR</s3><sZ>3 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>Maroc</country><wicri:noRegion>Casablanca</wicri:noRegion></affiliation></author><author><name sortKey="Hlil, E K" sort="Hlil, E K" uniqKey="Hlil E" first="E. K." last="Hlil">E. K. Hlil</name><affiliation wicri:level="4"><inist:fA14 i1="04"><s1>Institut Néel, CNRS et Université Joseph Fourier, BP 166</s1><s2>38042 Grenoble</s2><s3>FRA</s3><sZ>4 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Auvergne-Rhône-Alpes</region><region type="old region" nuts="2">Rhône-Alpes</region><settlement type="city">Grenoble</settlement></placeName><orgName type="university">Université Joseph Fourier</orgName></affiliation></author><author><name sortKey="Lassri, H" sort="Lassri, H" uniqKey="Lassri H" first="H." last="Lassri">H. Lassri</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>LPMMAT, Université Hassan II, Faculté des Sciences Ain Chock, B.P.5366 Maârif, Route d'El Jadida, km-8</s1><s2>Casablanca</s2><s3>MAR</s3><sZ>3 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>Maroc</country><wicri:noRegion>Casablanca</wicri:noRegion></affiliation></author><author><name sortKey="Moscovici, J" sort="Moscovici, J" uniqKey="Moscovici J" first="J." last="Moscovici">J. Moscovici</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>CMTR, ICMPE, UMR7182, CNRS - Université Paris Est Créteil, 2-8 rue Henri Dunant</s1><s2>94320 Thiais</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>6 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Île-de-France</region><settlement type="city">Thiais</settlement></placeName></affiliation></author><author><name sortKey="Mliki, N" sort="Mliki, N" uniqKey="Mliki N" first="N." last="Mliki">N. Mliki</name><affiliation wicri:level="4"><inist:fA14 i1="03"><s1>LMOP, Faculté des Sciences de Tunis, Université de Tunis El Manar</s1><s2>2092 Tunis</s2><s3>TUN</s3><sZ>2 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country>Tunisie</country><placeName><settlement type="city">Tunis</settlement><region nuts="2">Gouvernorat de Tunis</region></placeName><orgName type="university">Université de Tunis - El Manar</orgName><placeName><settlement type="city">Tunis</settlement><region type="region" nuts="2">Gouvernorat de Tunis</region></placeName></affiliation></author><author><name sortKey="Bessais, L" sort="Bessais, L" uniqKey="Bessais L" first="L." last="Bessais">L. Bessais</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>CMTR, ICMPE, UMR7182, CNRS - Université Paris Est Créteil, 2-8 rue Henri Dunant</s1><s2>94320 Thiais</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>6 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Île-de-France</region><settlement type="city">Thiais</settlement></placeName></affiliation></author></analytic><series><title level="j" type="main">Journal of alloys and compounds</title><title level="j" type="abbreviated">J. alloys compd.</title><idno type="ISSN">0925-8388</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of alloys and compounds</title><title level="j" type="abbreviated">J. alloys compd.</title><idno type="ISSN">0925-8388</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Annealing</term><term>Chemical synthesis</term><term>Cobalt alloys</term><term>Coercive force</term><term>Electronic density of states</term><term>Iron alloys</term><term>Magnetic moments</term><term>Magnetic nanomaterial</term><term>Magnetic particles</term><term>Microstructure</term><term>Nanomaterial synthesis</term><term>Nanoparticles</term><term>Saturation magnetization</term><term>Soft magnetic materials</term><term>Transition element alloys</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Moment magnétique</term><term>Densité état électron</term><term>Recuit</term><term>Microstructure</term><term>Synthèse nanomatériau</term><term>Synthèse chimique</term><term>Aimantation saturation</term><term>Force coercitive</term><term>Nanoparticule</term><term>Matériau magnétique doux</term><term>Fer alliage</term><term>Cobalt alliage</term><term>Particule magnétique</term><term>Nanomatériau magnétique</term><term>Métal transition alliage</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Soft-magnetic Fe<sub>55</sub>Co<sub>45</sub> alloy nanoparticles have been successfully synthesized by the polyol reduction process followed by annealing under argon. The diethylene glycol (DEG) was used as solvent and reducing agent simultaneously in this process. The synthesized samples of nanoparticles were annealed at 873 K for different times. The alloy formation processes, the evolution of the microstructure, the magnetic properties, and the DOS calculation have been investigated before and after samples annealing. The X-ray diffraction of the synthesized product before annealing shows that a cobalt ferrite is spinel structure of crystallite size of about 10 nm. X-ray diffraction analysis of the samples annealed at 873 K for different times also shows that of the FeCo alloy has been obtained by reducing the cobalt ferrite. It has been confirmed the formation of a body-centered-cubic (bcc) single phase structure where the wt.% increases with annealing times leading to a pure phase after annealing during 4 h. These results are confirmed by transmission electron microscopy study. The saturation magnetization of the Fe-Co alloys increases with annealing time, indicating an increasing homogeneity in composition and the single bcc FeCo phase formation. The highest saturation magnetization of 235 emu g<sup>-1</sup>with a low coercivity of 76 Oe was obtained for the Fe<sub>55</sub>Co<sub>45</sub>nanoparticles annealed during 4 h. The local random anisotropy constant K<sub>L</sub> has been extracted. This work presents also detailed information about total, and atom projected density of state functions, as well as the magnetic moment for different atoms in Fe<sub>55</sub>Co<sub>45</sub> alloys and cobalt ferrite.</div></front></TEI><affiliations><list><country><li>France</li><li>Maroc</li><li>Tunisie</li></country><region><li>Auvergne-Rhône-Alpes</li><li>Gouvernorat de Tunis</li><li>Rhône-Alpes</li><li>Île-de-France</li></region><settlement><li>Grenoble</li><li>Thiais</li><li>Tunis</li></settlement><orgName><li>Université Joseph Fourier</li><li>Université de Tunis - El Manar</li></orgName></list><tree><country name="France"><region name="Île-de-France"><name sortKey="Zehani, K" sort="Zehani, K" uniqKey="Zehani K" first="K." last="Zehani">K. Zehani</name></region><name sortKey="Bessais, L" sort="Bessais, L" uniqKey="Bessais L" first="L." last="Bessais">L. Bessais</name><name sortKey="Bez, R" sort="Bez, R" uniqKey="Bez R" first="R." last="Bez">R. Bez</name><name sortKey="Hlil, E K" sort="Hlil, E K" uniqKey="Hlil E" first="E. K." last="Hlil">E. K. Hlil</name><name sortKey="Moscovici, J" sort="Moscovici, J" uniqKey="Moscovici J" first="J." last="Moscovici">J. Moscovici</name></country><country name="Tunisie"><region name="Gouvernorat de Tunis"><name sortKey="Bez, R" sort="Bez, R" uniqKey="Bez R" first="R." last="Bez">R. Bez</name></region><name sortKey="Mliki, N" sort="Mliki, N" uniqKey="Mliki N" first="N." last="Mliki">N. Mliki</name></country><country name="Maroc"><noRegion><name sortKey="Boutahar, A" sort="Boutahar, A" uniqKey="Boutahar A" first="A." last="Boutahar">A. Boutahar</name></noRegion><name sortKey="Lassri, H" sort="Lassri, H" uniqKey="Lassri H" first="H." last="Lassri">H. Lassri</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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