CoPt nanoscale structures with different geometry prepared by electrodeposition for modulation of their magnetic properties
Identifieur interne : 003310 ( Main/Repository ); précédent : 003309; suivant : 003311CoPt nanoscale structures with different geometry prepared by electrodeposition for modulation of their magnetic properties
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Abstract
Different nanoscale structures of CoPt have been prepared by electrodeposition. Nonmagnetic materials were used in all cases, so that the substrates did not interfere in the magnetic properties of the deposits. Thin films of 200-300 nm-thick were obtained on glass/ITO substrates; nanoparticles of 150 nm of diameter were obtained over silicon; nanowires of 100-200 nm of diameter and 14 μm length were obtained by using polycarbonate membranes sputtered with Au. All deposited geometries had a fixed composition (68-71 wt.% Pt) and crystalline structure typical of Co-hcp, distorted due to platinum incorporation. A study of the magnetic properties of the different geometries was performed. Dramatic changes in magnetism have been detected, related to the shape of the nanostructures: nanowires presented the lowest coercivity (330-700 Oe), thin films had a coercivity value of 850 Oe, while nanoparticles had the highest coercivity (20400e). These coercivity variations were caused by different anisotropy contributions, depending on the geometry. The corrosion resistance test has been performed to determine the viability of the prepared nanostructures, nanostructures with higher exposed surface area had increase tendency to oxidation.
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">CoPt nanoscale structures with different geometry prepared by electrodeposition for modulation of their magnetic properties</title><author><name sortKey="Cortes, M" uniqKey="Cortes M">M. Cortes</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Electrodep, Departament de Quimica Física and Institut de Nanociència i Nanotecnologia (IN<sup>2</sup>UB), Universitat de Barcelona, Martí i Franques 1</s1><s2>08028 Barcelona</s2><s3>ESP</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Espagne</country><placeName><region nuts="2" type="communauté">Catalogne</region></placeName></affiliation></author><author><name sortKey="Serra, A" uniqKey="Serra A">A. Serra</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Electrodep, Departament de Quimica Física and Institut de Nanociència i Nanotecnologia (IN<sup>2</sup>UB), Universitat de Barcelona, Martí i Franques 1</s1><s2>08028 Barcelona</s2><s3>ESP</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Espagne</country><placeName><region nuts="2" type="communauté">Catalogne</region></placeName></affiliation></author><author><name sortKey="Gomez, E" uniqKey="Gomez E">E. Gomez</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Electrodep, Departament de Quimica Física and Institut de Nanociència i Nanotecnologia (IN<sup>2</sup>UB), Universitat de Barcelona, Martí i Franques 1</s1><s2>08028 Barcelona</s2><s3>ESP</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Espagne</country><placeName><region nuts="2" type="communauté">Catalogne</region></placeName></affiliation></author><author><name sortKey="Valles, E" uniqKey="Valles E">E. Valles</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Electrodep, Departament de Quimica Física and Institut de Nanociència i Nanotecnologia (IN<sup>2</sup>UB), Universitat de Barcelona, Martí i Franques 1</s1><s2>08028 Barcelona</s2><s3>ESP</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Espagne</country><placeName><region nuts="2" type="communauté">Catalogne</region></placeName></affiliation></author></titleStmt><publicationStmt><idno type="inist">12-0208287</idno><date when="2011">2011</date><idno type="stanalyst">PASCAL 12-0208287 INIST</idno><idno type="RBID">Pascal:12-0208287</idno><idno type="wicri:Area/Main/Corpus">001E05</idno><idno type="wicri:Area/Main/Repository">003310</idno></publicationStmt><seriesStmt><idno type="ISSN">0013-4686</idno><title level="j" type="abbreviated">Electrochim. acta</title><title level="j" type="main">Electrochimica acta</title></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Binary alloy</term><term>Cobalt alloy</term><term>Electrochemical reaction</term><term>Electrodeposition</term><term>Electrodes</term><term>Geometry</term><term>Glass</term><term>Indium tin oxide electrode</term><term>Magnetic properties</term><term>Morphology</term><term>Nanoparticle</term><term>Nanostructure</term><term>Nanowires</term><term>Platinum alloy</term><term>Preparation</term><term>Scanning electron microscopy</term><term>Surface structure</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Platine alliage</term><term>Alliage binaire</term><term>Cobalt alliage</term><term>Nanostructure</term><term>Géométrie</term><term>Préparation</term><term>Dépôt électrolytique</term><term>Propriété magnétique</term><term>Nanoparticule</term><term>Nanofil</term><term>Microscopie électronique balayage</term><term>Electrode</term><term>Verre</term><term>Electrode ITO</term><term>Réaction électrochimique</term><term>Structure surface</term><term>Morphologie</term></keywords><keywords scheme="Wicri" type="concept" xml:lang="fr"><term>Verre</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Different nanoscale structures of CoPt have been prepared by electrodeposition. Nonmagnetic materials were used in all cases, so that the substrates did not interfere in the magnetic properties of the deposits. Thin films of 200-300 nm-thick were obtained on glass/ITO substrates; nanoparticles of 150 nm of diameter were obtained over silicon; nanowires of 100-200 nm of diameter and 14 μm length were obtained by using polycarbonate membranes sputtered with Au. All deposited geometries had a fixed composition (68-71 wt.% Pt) and crystalline structure typical of Co-hcp, distorted due to platinum incorporation. A study of the magnetic properties of the different geometries was performed. Dramatic changes in magnetism have been detected, related to the shape of the nanostructures: nanowires presented the lowest coercivity (330-700 Oe), thin films had a coercivity value of 850 Oe, while nanoparticles had the highest coercivity (20400e). These coercivity variations were caused by different anisotropy contributions, depending on the geometry. The corrosion resistance test has been performed to determine the viability of the prepared nanostructures, nanostructures with higher exposed surface area had increase tendency to oxidation.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0013-4686</s0></fA01><fA02 i1="01"><s0>ELCAAV</s0></fA02><fA03 i2="1"><s0>Electrochim. acta</s0></fA03><fA05><s2>56</s2></fA05><fA06><s2>24</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>CoPt nanoscale structures with different geometry prepared by electrodeposition for modulation of their magnetic properties</s1></fA08><fA11 i1="01" i2="1"><s1>CORTES (M.)</s1></fA11><fA11 i1="02" i2="1"><s1>SERRA (A.)</s1></fA11><fA11 i1="03" i2="1"><s1>GOMEZ (E.)</s1></fA11><fA11 i1="04" i2="1"><s1>VALLES (E.)</s1></fA11><fA14 i1="01"><s1>Electrodep, Departament de Quimica Física and Institut de Nanociència i Nanotecnologia (IN<sup>2</sup>UB), Universitat de Barcelona, Martí i Franques 1</s1><s2>08028 Barcelona</s2><s3>ESP</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></fA14><fA20><s1>8232-8238</s1></fA20><fA21><s1>2011</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>1516</s2><s5>354000509942280190</s5></fA43><fA44><s0>0000</s0><s1>© 2012 INIST-CNRS. All rights reserved.</s1></fA44><fA45><s0>32 ref.</s0></fA45><fA47 i1="01" i2="1"><s0>12-0208287</s0></fA47><fA60><s1>P</s1></fA60><fA61><s0>A</s0></fA61><fA64 i1="01" i2="1"><s0>Electrochimica acta</s0></fA64><fA66 i1="01"><s0>GBR</s0></fA66><fC01 i1="01" l="ENG"><s0>Different nanoscale structures of CoPt have been prepared by electrodeposition. Nonmagnetic materials were used in all cases, so that the substrates did not interfere in the magnetic properties of the deposits. Thin films of 200-300 nm-thick were obtained on glass/ITO substrates; nanoparticles of 150 nm of diameter were obtained over silicon; nanowires of 100-200 nm of diameter and 14 μm length were obtained by using polycarbonate membranes sputtered with Au. All deposited geometries had a fixed composition (68-71 wt.% Pt) and crystalline structure typical of Co-hcp, distorted due to platinum incorporation. A study of the magnetic properties of the different geometries was performed. Dramatic changes in magnetism have been detected, related to the shape of the nanostructures: nanowires presented the lowest coercivity (330-700 Oe), thin films had a coercivity value of 850 Oe, while nanoparticles had the highest coercivity (20400e). These coercivity variations were caused by different anisotropy contributions, depending on the geometry. 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