High Exchange Bias in Fe3-δO4@CoO Core Shell Nanoparticles Synthesized by a One-Pot Seed-Mediated Growth Method
Identifieur interne : 000021 ( PascalFrancis/Corpus ); précédent : 000020; suivant : 000022High Exchange Bias in Fe3-δO4@CoO Core Shell Nanoparticles Synthesized by a One-Pot Seed-Mediated Growth Method
Auteurs : Walid Baaziz ; Benoît P. Pichon ; Christophe Lefevre ; Corinne Ulhaq-Bouillet ; Jean-Marc Greneche ; Mohamed Toumi ; Tahar Mhiri ; Sylvie Be-ColinSource :
- 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.
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Format Inist (serveur)
| NO : | PASCAL 13-0316380 INIST |
|---|---|
| ET : | High Exchange Bias in Fe3-δO4@CoO Core Shell Nanoparticles Synthesized by a One-Pot Seed-Mediated Growth Method |
| AU : | BAAZIZ (Walid); PICHON (Benoît P.); LEFEVRE (Christophe); ULHAQ-BOUILLET (Corinne); GRENECHE (Jean-Marc); TOUMI (Mohamed); MHIRI (Tahar); BE-COLIN (Sylvie) |
| AF : | Institut de Physique et de Chimie des Matériaux de Strasbourg, UMR CNRS-UdS 7504, 23 rue du Loess BP 43/67034 Strasbourg/France (1 aut., 2 aut., 3 aut., 4 aut., 8 aut.); Faculté des Sciences de Sfax, Laboratoire de l'Etat Solide, Route de la Soukra km 3.5 BP 1171/3000 Sfax/Tunisie (1 aut., 6 aut., 7 aut.); LUNAM Université du Maine, Institut des Molecules et Matériaux du Mans IMMM, UMR CNRS 6283/72085, Le Mans/France (5 aut.) |
| DT : | Publication en série; Niveau analytique |
| SO : | Journal of physical chemistry. C; ISSN 1932-7447; Etats-Unis; Da. 2013; Vol. 117; No. 21; Pp. 11436-11443; Bibl. 37 ref. |
| LA : | Anglais |
| EA : | 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. |
| CC : | 001B70E75 |
| FD : | 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 |
| ED : | Exchange interactions; Field emission ion microscopy; Magnetic field effects; Nanomaterial synthesis; Magnetic anisotropy; Growth mechanism; Thermal decomposition; XRD; Transmission electron microscopy; Electron energy loss spectra; Magnetic properties; Cobalt oxide; Ferrimagnetic materials; Magnetic particles; Magnetic nanomaterial; Iron oxide; Core shell structure; Top seeding growth |
| SD : | Síntesis nanomaterial; Mecanismo crecimiento; Descomposición térmica; Cobalto óxido; Nanomaterial magnético; Hierro óxido |
| LO : | INIST-549C.354000504199290630 |
| ID : | 13-0316380 |
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Pichon</name><affiliation><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></affiliation></author><author><name sortKey="Lefevre, Christophe" sort="Lefevre, Christophe" uniqKey="Lefevre C" first="Christophe" last="Lefevre">Christophe Lefevre</name><affiliation><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></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><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></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><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></affiliation></author><author><name sortKey="Toumi, Mohamed" sort="Toumi, Mohamed" uniqKey="Toumi M" first="Mohamed" last="Toumi">Mohamed Toumi</name><affiliation><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></affiliation></author><author><name sortKey="Mhiri, Tahar" sort="Mhiri, Tahar" uniqKey="Mhiri T" first="Tahar" last="Mhiri">Tahar Mhiri</name><affiliation><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></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><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></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><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>1932-7447</s0></fA01><fA03 i2="1"><s0>J. phys. chem., C</s0></fA03><fA05><s2>117</s2></fA05><fA06><s2>21</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>High Exchange Bias in Fe<sub>3-δ</sub>O<sub>4</sub>@CoO Core Shell Nanoparticles Synthesized by a One-Pot Seed-Mediated Growth Method</s1></fA08><fA11 i1="01" i2="1"><s1>BAAZIZ (Walid)</s1></fA11><fA11 i1="02" i2="1"><s1>PICHON (Benoît P.)</s1></fA11><fA11 i1="03" i2="1"><s1>LEFEVRE (Christophe)</s1></fA11><fA11 i1="04" i2="1"><s1>ULHAQ-BOUILLET (Corinne)</s1></fA11><fA11 i1="05" i2="1"><s1>GRENECHE (Jean-Marc)</s1></fA11><fA11 i1="06" i2="1"><s1>TOUMI (Mohamed)</s1></fA11><fA11 i1="07" i2="1"><s1>MHIRI (Tahar)</s1></fA11><fA11 i1="08" i2="1"><s1>BE-COLIN (Sylvie)</s1></fA11><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></fA14><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></fA14><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></fA14><fA20><s1>11436-11443</s1></fA20><fA21><s1>2013</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>549C</s2><s5>354000504199290630</s5></fA43><fA44><s0>0000</s0><s1>© 2013 INIST-CNRS. All rights reserved.</s1></fA44><fA45><s0>37 ref.</s0></fA45><fA47 i1="01" i2="1"><s0>13-0316380</s0></fA47><fA60><s1>P</s1></fA60><fA61><s0>A</s0></fA61><fA64 i1="01" i2="1"><s0>Journal of physical chemistry. C</s0></fA64><fA66 i1="01"><s0>USA</s0></fA66><fC01 i1="01" l="ENG"><s0>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.</s0></fC01><fC02 i1="01" i2="3"><s0>001B70E75</s0></fC02><fC03 i1="01" i2="3" l="FRE"><s0>Interaction échange</s0><s5>02</s5></fC03><fC03 i1="01" i2="3" l="ENG"><s0>Exchange interactions</s0><s5>02</s5></fC03><fC03 i1="02" i2="3" l="FRE"><s0>Microscopie ionique émission champ</s0><s5>03</s5></fC03><fC03 i1="02" i2="3" l="ENG"><s0>Field emission ion microscopy</s0><s5>03</s5></fC03><fC03 i1="03" i2="3" l="FRE"><s0>Effet champ magnétique</s0><s5>04</s5></fC03><fC03 i1="03" i2="3" l="ENG"><s0>Magnetic field effects</s0><s5>04</s5></fC03><fC03 i1="04" i2="X" l="FRE"><s0>Synthèse nanomatériau</s0><s5>05</s5></fC03><fC03 i1="04" i2="X" l="ENG"><s0>Nanomaterial synthesis</s0><s5>05</s5></fC03><fC03 i1="04" i2="X" l="SPA"><s0>Síntesis nanomaterial</s0><s5>05</s5></fC03><fC03 i1="05" i2="3" l="FRE"><s0>Anisotropie magnétique</s0><s5>07</s5></fC03><fC03 i1="05" i2="3" l="ENG"><s0>Magnetic anisotropy</s0><s5>07</s5></fC03><fC03 i1="06" i2="X" l="FRE"><s0>Mécanisme croissance</s0><s5>08</s5></fC03><fC03 i1="06" i2="X" l="ENG"><s0>Growth mechanism</s0><s5>08</s5></fC03><fC03 i1="06" i2="X" l="SPA"><s0>Mecanismo crecimiento</s0><s5>08</s5></fC03><fC03 i1="07" i2="X" l="FRE"><s0>Décomposition thermique</s0><s5>09</s5></fC03><fC03 i1="07" i2="X" l="ENG"><s0>Thermal decomposition</s0><s5>09</s5></fC03><fC03 i1="07" i2="X" l="SPA"><s0>Descomposición térmica</s0><s5>09</s5></fC03><fC03 i1="08" i2="3" l="FRE"><s0>Diffraction RX</s0><s5>11</s5></fC03><fC03 i1="08" i2="3" l="ENG"><s0>XRD</s0><s5>11</s5></fC03><fC03 i1="09" i2="3" l="FRE"><s0>Microscopie électronique transmission</s0><s5>12</s5></fC03><fC03 i1="09" i2="3" l="ENG"><s0>Transmission electron microscopy</s0><s5>12</s5></fC03><fC03 i1="10" i2="3" l="FRE"><s0>Spectre perte énergie électron</s0><s5>13</s5></fC03><fC03 i1="10" i2="3" l="ENG"><s0>Electron energy loss spectra</s0><s5>13</s5></fC03><fC03 i1="11" i2="3" l="FRE"><s0>Propriété magnétique</s0><s5>14</s5></fC03><fC03 i1="11" i2="3" l="ENG"><s0>Magnetic properties</s0><s5>14</s5></fC03><fC03 i1="12" i2="X" l="FRE"><s0>Oxyde de cobalt</s0><s5>15</s5></fC03><fC03 i1="12" i2="X" l="ENG"><s0>Cobalt oxide</s0><s5>15</s5></fC03><fC03 i1="12" i2="X" l="SPA"><s0>Cobalto óxido</s0><s5>15</s5></fC03><fC03 i1="13" i2="3" l="FRE"><s0>Matériau ferrimagnétique</s0><s5>16</s5></fC03><fC03 i1="13" i2="3" l="ENG"><s0>Ferrimagnetic materials</s0><s5>16</s5></fC03><fC03 i1="14" i2="3" l="FRE"><s0>Particule magnétique</s0><s5>18</s5></fC03><fC03 i1="14" i2="3" l="ENG"><s0>Magnetic particles</s0><s5>18</s5></fC03><fC03 i1="15" i2="X" l="FRE"><s0>Nanomatériau magnétique</s0><s5>19</s5></fC03><fC03 i1="15" i2="X" l="ENG"><s0>Magnetic nanomaterial</s0><s5>19</s5></fC03><fC03 i1="15" i2="X" l="SPA"><s0>Nanomaterial magnético</s0><s5>19</s5></fC03><fC03 i1="16" i2="X" l="FRE"><s0>Oxyde de fer</s0><s5>20</s5></fC03><fC03 i1="16" i2="X" l="ENG"><s0>Iron oxide</s0><s5>20</s5></fC03><fC03 i1="16" i2="X" l="SPA"><s0>Hierro óxido</s0><s5>20</s5></fC03><fC03 i1="17" i2="3" l="FRE"><s0>Structure coeur coquille</s0><s4>CD</s4><s5>96</s5></fC03><fC03 i1="17" i2="3" l="ENG"><s0>Core shell structure</s0><s4>CD</s4><s5>96</s5></fC03><fC03 i1="18" i2="3" l="FRE"><s0>Croissance assistée par germe</s0><s4>CD</s4><s5>97</s5></fC03><fC03 i1="18" i2="3" l="ENG"><s0>Top seeding growth</s0><s4>CD</s4><s5>97</s5></fC03><fN21><s1>301</s1></fN21></pA></standard><server><NO>PASCAL 13-0316380 INIST</NO><ET>High Exchange Bias in Fe<sub>3-δ</sub>O<sub>4</sub>@CoO Core Shell Nanoparticles Synthesized by a One-Pot Seed-Mediated Growth Method</ET><AU>BAAZIZ (Walid); PICHON (Benoît P.); LEFEVRE (Christophe); ULHAQ-BOUILLET (Corinne); GRENECHE (Jean-Marc); TOUMI (Mohamed); MHIRI (Tahar); BE-COLIN (Sylvie)</AU><AF>Institut de Physique et de Chimie des Matériaux de Strasbourg, UMR CNRS-UdS 7504, 23 rue du Loess BP 43/67034 Strasbourg/France (1 aut., 2 aut., 3 aut., 4 aut., 8 aut.); Faculté des Sciences de Sfax, Laboratoire de l'Etat Solide, Route de la Soukra km 3.5 BP 1171/3000 Sfax/Tunisie (1 aut., 6 aut., 7 aut.); LUNAM Université du Maine, Institut des Molecules et Matériaux du Mans IMMM, UMR CNRS 6283/72085, Le Mans/France (5 aut.)</AF><DT>Publication en série; Niveau analytique</DT><SO>Journal of physical chemistry. C; ISSN 1932-7447; Etats-Unis; Da. 2013; Vol. 117; No. 21; Pp. 11436-11443; Bibl. 37 ref.</SO><LA>Anglais</LA><EA>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.</EA><CC>001B70E75</CC><FD>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</FD><ED>Exchange interactions; Field emission ion microscopy; Magnetic field effects; Nanomaterial synthesis; Magnetic anisotropy; Growth mechanism; Thermal decomposition; XRD; Transmission electron microscopy; Electron energy loss spectra; Magnetic properties; Cobalt oxide; Ferrimagnetic materials; Magnetic particles; Magnetic nanomaterial; Iron oxide; Core shell structure; Top seeding growth</ED><SD>Síntesis nanomaterial; Mecanismo crecimiento; Descomposición térmica; Cobalto óxido; Nanomaterial magnético; Hierro óxido</SD><LO>INIST-549C.354000504199290630</LO><ID>13-0316380</ID></server></inist></record>Pour manipuler ce document sous Unix (Dilib)
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