High Exchange Bias in Fe3-δO4@CoO Core Shell Nanoparticles Synthesized by a One-Pot Seed-Mediated Growth Method
Identifieur interne : 000046 ( France/Analysis ); précédent : 000045; suivant : 000047High Exchange Bias in Fe3-δO4@CoO Core Shell Nanoparticles Synthesized by a One-Pot Seed-Mediated Growth Method
Auteurs : Walid Baaziz [France, Tunisie] ; Benoît P. Pichon [France] ; Christophe Lefevre [France] ; Corinne Ulhaq-Bouillet [France] ; Jean-Marc Greneche [France] ; Mohamed Toumi [Tunisie] ; Tahar Mhiri [Tunisie] ; Sylvie Be-Colin [France]Source :
- Journal of physical chemistry. C [ 1932-7447 ] ; 2013.
Descripteurs français
- Pascal (Inist)
- Interaction échange, Microscopie ionique émission champ, Effet champ magnétique, Synthèse nanomatériau, Anisotropie magnétique, Mécanisme croissance, Décomposition thermique, Diffraction RX, Microscopie électronique transmission, Spectre perte énergie électron, Propriété magnétique, Oxyde de cobalt, Matériau ferrimagnétique, Particule magnétique, Nanomatériau magnétique, Oxyde de fer, Structure coeur coquille, Croissance assistée par germe.
English descriptors
- KwdEn :
- Cobalt oxide, Core shell structure, Electron energy loss spectra, Exchange interactions, Ferrimagnetic materials, Field emission ion microscopy, Growth mechanism, Iron oxide, Magnetic anisotropy, Magnetic field effects, Magnetic nanomaterial, Magnetic particles, Magnetic properties, Nanomaterial synthesis, Thermal decomposition, Top seeding growth, Transmission electron microscopy, XRD.
Abstract
Core-shell nanoparticles (NPs), which consist in a ferrimagnetic (FIM)/antiferromagnetic (AFM) interface and result in exchange bias coupling, became recently of primary importance in the field of magnetic nanoparticles. The enhancement of some applications such as hyperthermia or magnetic storage media based on the miniaturization of devices is correlated to the size reduction of NPs, which results in the decrease of the magnetocrystalline anisotropy and of the blocking temperature. We present here the synthesis of Fe3-δO4@CoO core-shell NPs by a one-pot seed-mediated growth process based on the thermal decomposition of metal complexes at high temperature. A 2 nm thick CoO shell was grown homogeneously from the starting Fe3-δO4 core surface. The Fe3-δO4@CoO core-shell NP structure has been deeply investigated by performing XRD and advanced techniques based on TEM such as EELS and EFTEM. The high quality of the core-shell interface resulted in the large exchange bias coupling at 5 K (HE ≃ 4.1 kOe) between the FIM and the AFM components. In comparison to starting Fe3-δO4 NPs, the dramatic enhancement of the magnetic properties such as a high coercive field (at 5 K, HC ≃ 15 kOe) were measured. Furthermore, the core-shell structure resulted in the enhancement of the magnetocrystalline anisotropy and the increase of the blocking temperature to 293 K.
Affiliations:
- France, Tunisie
- Alsace (région administrative), Grand Est, Pays de la Loire
- Le Mans, Strasbourg
- Université du Maine
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Pascal:13-0316380Le document en format XML
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wicri:level="1"><inist:fA14 i1="02"><s1>Faculté des Sciences de Sfax, Laboratoire de l'Etat Solide, Route de la Soukra km 3.5 BP 1171</s1><s2>3000 Sfax</s2><s3>TUN</s3><sZ>1 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country>Tunisie</country><wicri:noRegion>3000 Sfax</wicri:noRegion></affiliation></author><author><name sortKey="Pichon, Benoit P" sort="Pichon, Benoit P" uniqKey="Pichon B" first="Benoît P." last="Pichon">Benoît P. Pichon</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Institut de Physique et de Chimie des Matériaux de Strasbourg, UMR CNRS-UdS 7504, 23 rue du Loess BP 43</s1><s2>67034 Strasbourg</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Alsace (région administrative)</region><settlement type="city">Strasbourg</settlement></placeName></affiliation></author><author><name sortKey="Lefevre, Christophe" sort="Lefevre, Christophe" uniqKey="Lefevre C" first="Christophe" last="Lefevre">Christophe Lefevre</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Institut de Physique et de Chimie des Matériaux de Strasbourg, UMR CNRS-UdS 7504, 23 rue du Loess BP 43</s1><s2>67034 Strasbourg</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Alsace (région administrative)</region><settlement type="city">Strasbourg</settlement></placeName></affiliation></author><author><name sortKey="Ulhaq Bouillet, Corinne" sort="Ulhaq Bouillet, Corinne" uniqKey="Ulhaq Bouillet C" first="Corinne" last="Ulhaq-Bouillet">Corinne Ulhaq-Bouillet</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Institut de Physique et de Chimie des Matériaux de Strasbourg, UMR CNRS-UdS 7504, 23 rue du Loess BP 43</s1><s2>67034 Strasbourg</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Alsace (région administrative)</region><settlement type="city">Strasbourg</settlement></placeName></affiliation></author><author><name sortKey="Greneche, Jean Marc" sort="Greneche, Jean Marc" uniqKey="Greneche J" first="Jean-Marc" last="Greneche">Jean-Marc Greneche</name><affiliation wicri:level="4"><inist:fA14 i1="03"><s1>LUNAM Université du Maine, Institut des Molecules et Matériaux du Mans IMMM, UMR CNRS 6283</s1><s2>72085, Le Mans</s2><s3>FRA</s3><sZ>5 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region">Pays de la Loire</region><region type="old region">Pays de la Loire</region><settlement type="city">Le Mans</settlement></placeName><orgName type="university">Université du Maine</orgName></affiliation></author><author><name sortKey="Toumi, Mohamed" sort="Toumi, Mohamed" uniqKey="Toumi M" first="Mohamed" last="Toumi">Mohamed Toumi</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Faculté des Sciences de Sfax, Laboratoire de l'Etat Solide, Route de la Soukra km 3.5 BP 1171</s1><s2>3000 Sfax</s2><s3>TUN</s3><sZ>1 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country>Tunisie</country><wicri:noRegion>3000 Sfax</wicri:noRegion></affiliation></author><author><name sortKey="Mhiri, Tahar" sort="Mhiri, Tahar" uniqKey="Mhiri T" first="Tahar" last="Mhiri">Tahar Mhiri</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Faculté des Sciences de Sfax, Laboratoire de l'Etat Solide, Route de la Soukra km 3.5 BP 1171</s1><s2>3000 Sfax</s2><s3>TUN</s3><sZ>1 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country>Tunisie</country><wicri:noRegion>3000 Sfax</wicri:noRegion></affiliation></author><author><name sortKey="Be Colin, Sylvie" sort="Be Colin, Sylvie" uniqKey="Be Colin S" first="Sylvie" last="Be-Colin">Sylvie Be-Colin</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Institut de Physique et de Chimie des Matériaux de Strasbourg, UMR CNRS-UdS 7504, 23 rue du Loess BP 43</s1><s2>67034 Strasbourg</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Alsace (région administrative)</region><settlement type="city">Strasbourg</settlement></placeName></affiliation></author></analytic><series><title level="j" type="main">Journal of physical chemistry. C</title><title level="j" type="abbreviated">J. phys. chem., C</title><idno type="ISSN">1932-7447</idno><imprint><date when="2013">2013</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of physical chemistry. C</title><title level="j" type="abbreviated">J. phys. chem., C</title><idno type="ISSN">1932-7447</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Cobalt oxide</term><term>Core shell structure</term><term>Electron energy loss spectra</term><term>Exchange interactions</term><term>Ferrimagnetic materials</term><term>Field emission ion microscopy</term><term>Growth mechanism</term><term>Iron oxide</term><term>Magnetic anisotropy</term><term>Magnetic field effects</term><term>Magnetic nanomaterial</term><term>Magnetic particles</term><term>Magnetic properties</term><term>Nanomaterial synthesis</term><term>Thermal decomposition</term><term>Top seeding growth</term><term>Transmission electron microscopy</term><term>XRD</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Interaction échange</term><term>Microscopie ionique émission champ</term><term>Effet champ magnétique</term><term>Synthèse nanomatériau</term><term>Anisotropie magnétique</term><term>Mécanisme croissance</term><term>Décomposition thermique</term><term>Diffraction RX</term><term>Microscopie électronique transmission</term><term>Spectre perte énergie électron</term><term>Propriété magnétique</term><term>Oxyde de cobalt</term><term>Matériau ferrimagnétique</term><term>Particule magnétique</term><term>Nanomatériau magnétique</term><term>Oxyde de fer</term><term>Structure coeur coquille</term><term>Croissance assistée par germe</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Core-shell nanoparticles (NPs), which consist in a ferrimagnetic (FIM)/antiferromagnetic (AFM) interface and result in exchange bias coupling, became recently of primary importance in the field of magnetic nanoparticles. The enhancement of some applications such as hyperthermia or magnetic storage media based on the miniaturization of devices is correlated to the size reduction of NPs, which results in the decrease of the magnetocrystalline anisotropy and of the blocking temperature. We present here the synthesis of Fe<sub>3-δ</sub>O<sub>4</sub>@CoO core-shell NPs by a one-pot seed-mediated growth process based on the thermal decomposition of metal complexes at high temperature. A 2 nm thick CoO shell was grown homogeneously from the starting Fe<sub>3</sub>-<sub>δ</sub>O<sub>4</sub> core surface. The Fe<sub>3</sub>-<sub>δ</sub>O<sub>4</sub>@CoO core-shell NP structure has been deeply investigated by performing XRD and advanced techniques based on TEM such as EELS and EFTEM. The high quality of the core-shell interface resulted in the large exchange bias coupling at 5 K (H<sub>E</sub> ≃ 4.1 kOe) between the FIM and the AFM components. In comparison to starting Fe<sub>3-δ</sub>O<sub>4</sub> NPs, the dramatic enhancement of the magnetic properties such as a high coercive field (at 5 K, H<sub>C</sub> ≃ 15 kOe) were measured. Furthermore, the core-shell structure resulted in the enhancement of the magnetocrystalline anisotropy and the increase of the blocking temperature to 293 K.</div></front></TEI><affiliations><list><country><li>France</li><li>Tunisie</li></country><region><li>Alsace (région administrative)</li><li>Grand Est</li><li>Pays de la Loire</li></region><settlement><li>Le Mans</li><li>Strasbourg</li></settlement><orgName><li>Université du Maine</li></orgName></list><tree><country name="France"><region name="Grand Est"><name sortKey="Baaziz, Walid" sort="Baaziz, Walid" uniqKey="Baaziz W" first="Walid" last="Baaziz">Walid Baaziz</name></region><name sortKey="Be Colin, Sylvie" sort="Be Colin, Sylvie" uniqKey="Be Colin S" first="Sylvie" last="Be-Colin">Sylvie Be-Colin</name><name sortKey="Greneche, Jean Marc" sort="Greneche, Jean Marc" uniqKey="Greneche J" first="Jean-Marc" last="Greneche">Jean-Marc Greneche</name><name sortKey="Lefevre, Christophe" sort="Lefevre, Christophe" uniqKey="Lefevre C" first="Christophe" last="Lefevre">Christophe Lefevre</name><name sortKey="Pichon, Benoit P" sort="Pichon, Benoit P" uniqKey="Pichon B" first="Benoît P." last="Pichon">Benoît P. Pichon</name><name sortKey="Ulhaq Bouillet, Corinne" sort="Ulhaq Bouillet, Corinne" uniqKey="Ulhaq Bouillet C" first="Corinne" last="Ulhaq-Bouillet">Corinne Ulhaq-Bouillet</name></country><country name="Tunisie"><noRegion><name sortKey="Baaziz, Walid" sort="Baaziz, Walid" uniqKey="Baaziz W" first="Walid" last="Baaziz">Walid Baaziz</name></noRegion><name sortKey="Mhiri, Tahar" sort="Mhiri, Tahar" uniqKey="Mhiri T" first="Tahar" last="Mhiri">Tahar Mhiri</name><name sortKey="Toumi, Mohamed" sort="Toumi, Mohamed" uniqKey="Toumi M" first="Mohamed" last="Toumi">Mohamed Toumi</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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