Magnetization Drop at High Temperature in Oleic Acid-Coated Magnetite Nanoparticles
In this work we report an irreversible behavior in the magnetization of oleic acid (OA)-coated magnetite nanoparticles (NPs) at high temperature. On one hand, when the sample is heated-up, an irreversible magnetization drop is observed at 550 K, while the Curie temperature (Tc ≈ 840 K) remains close...
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| Veröffentlicht in: | IEEE transactions on magnetics 2012-11, Vol.48 (11), p.3307-3310 |
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| container_title | IEEE transactions on magnetics |
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| creator | Rodriguez, C. Banobre-Lopez, M. Kolen'ko, Y. V. Rodriguez, B. Freitas, P. Rivas, J. |
| description | In this work we report an irreversible behavior in the magnetization of oleic acid (OA)-coated magnetite nanoparticles (NPs) at high temperature. On one hand, when the sample is heated-up, an irreversible magnetization drop is observed at 550 K, while the Curie temperature (Tc ≈ 840 K) remains close to that of bulk magnetite. On the other hand, a significant reduction of the magnetic moment has been found after heating and cooling the sample above and below its Curie temperature, respectively. Both magnetic features have been also observed in other surface modified magnetite nanoparticles [e.g., polyvynil pyrrolidone (PVP)-coated]. However, no reduction of the magnetic moment upon a heating-cooling cycle has been found in ligand-free magnetite nanoparticles. This fact suggests that surface effects derived from the OA-coating could be the origin of such reduction of the magnetic moment, as a consequence of thermal decomposition of the organic layer surrounding the nanoparticle and the subsequent loss of the magnetic surface order. This feature could be an important factor for those applications requiring high temperatures. |
| doi_str_mv | 10.1109/TMAG.2012.2194273 |
| format | Article |
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V. ; Rodriguez, B. ; Freitas, P. ; Rivas, J.</creator><creatorcontrib>Rodriguez, C. ; Banobre-Lopez, M. ; Kolen'ko, Y. V. ; Rodriguez, B. ; Freitas, P. ; Rivas, J.</creatorcontrib><description>In this work we report an irreversible behavior in the magnetization of oleic acid (OA)-coated magnetite nanoparticles (NPs) at high temperature. On one hand, when the sample is heated-up, an irreversible magnetization drop is observed at 550 K, while the Curie temperature (Tc ≈ 840 K) remains close to that of bulk magnetite. On the other hand, a significant reduction of the magnetic moment has been found after heating and cooling the sample above and below its Curie temperature, respectively. Both magnetic features have been also observed in other surface modified magnetite nanoparticles [e.g., polyvynil pyrrolidone (PVP)-coated]. However, no reduction of the magnetic moment upon a heating-cooling cycle has been found in ligand-free magnetite nanoparticles. This fact suggests that surface effects derived from the OA-coating could be the origin of such reduction of the magnetic moment, as a consequence of thermal decomposition of the organic layer surrounding the nanoparticle and the subsequent loss of the magnetic surface order. This feature could be an important factor for those applications requiring high temperatures.</description><identifier>ISSN: 0018-9464</identifier><identifier>EISSN: 1941-0069</identifier><identifier>DOI: 10.1109/TMAG.2012.2194273</identifier><identifier>CODEN: IEMGAQ</identifier><language>eng</language><publisher>New York, NY: IEEE</publisher><subject>Cross-disciplinary physics: materials science; rheology ; Exact sciences and technology ; Heating ; Magnetic fields ; Magnetic moments ; Magnetic resonance imaging ; Magnetic separation ; Magnetism ; Magnetite nanoparticles ; Materials science ; Nanoparticles ; Other topics in materials science ; Physics ; Saturation magnetization ; surface functionalization ; surface spin disorder ; Surface treatment</subject><ispartof>IEEE transactions on magnetics, 2012-11, Vol.48 (11), p.3307-3310</ispartof><rights>2014 INIST-CNRS</rights><rights>Copyright The Institute of Electrical and Electronics Engineers, Inc. (IEEE) Nov 2012</rights><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c323t-68d62cffb057c6356cde782d2c28ec2655ff8f5a28bd9ec88014964290c24dc3</citedby><cites>FETCH-LOGICAL-c323t-68d62cffb057c6356cde782d2c28ec2655ff8f5a28bd9ec88014964290c24dc3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://ieeexplore.ieee.org/document/6332642$$EHTML$$P50$$Gieee$$H</linktohtml><link.rule.ids>309,310,314,780,784,789,790,796,23928,23929,25138,27922,27923,54756</link.rule.ids><linktorsrc>$$Uhttps://ieeexplore.ieee.org/document/6332642$$EView_record_in_IEEE$$FView_record_in_$$GIEEE</linktorsrc><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=26685438$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Rodriguez, C.</creatorcontrib><creatorcontrib>Banobre-Lopez, M.</creatorcontrib><creatorcontrib>Kolen'ko, Y. V.</creatorcontrib><creatorcontrib>Rodriguez, B.</creatorcontrib><creatorcontrib>Freitas, P.</creatorcontrib><creatorcontrib>Rivas, J.</creatorcontrib><title>Magnetization Drop at High Temperature in Oleic Acid-Coated Magnetite Nanoparticles</title><title>IEEE transactions on magnetics</title><addtitle>TMAG</addtitle><description>In this work we report an irreversible behavior in the magnetization of oleic acid (OA)-coated magnetite nanoparticles (NPs) at high temperature. On one hand, when the sample is heated-up, an irreversible magnetization drop is observed at 550 K, while the Curie temperature (Tc ≈ 840 K) remains close to that of bulk magnetite. On the other hand, a significant reduction of the magnetic moment has been found after heating and cooling the sample above and below its Curie temperature, respectively. Both magnetic features have been also observed in other surface modified magnetite nanoparticles [e.g., polyvynil pyrrolidone (PVP)-coated]. However, no reduction of the magnetic moment upon a heating-cooling cycle has been found in ligand-free magnetite nanoparticles. This fact suggests that surface effects derived from the OA-coating could be the origin of such reduction of the magnetic moment, as a consequence of thermal decomposition of the organic layer surrounding the nanoparticle and the subsequent loss of the magnetic surface order. This feature could be an important factor for those applications requiring high temperatures.</description><subject>Cross-disciplinary physics: materials science; rheology</subject><subject>Exact sciences and technology</subject><subject>Heating</subject><subject>Magnetic fields</subject><subject>Magnetic moments</subject><subject>Magnetic resonance imaging</subject><subject>Magnetic separation</subject><subject>Magnetism</subject><subject>Magnetite nanoparticles</subject><subject>Materials science</subject><subject>Nanoparticles</subject><subject>Other topics in materials science</subject><subject>Physics</subject><subject>Saturation magnetization</subject><subject>surface functionalization</subject><subject>surface spin disorder</subject><subject>Surface treatment</subject><issn>0018-9464</issn><issn>1941-0069</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNo9kM1OwzAQhC0EEqXwAIiLJcQxxT-x4xyrAi1SSw_kbrnOprgKSbDdAzw9rlr1tLvab3ZHg9A9JRNKSflcrabzCSOUTRgtc1bwCzRKDc0IkeUlGhFCVVbmMr9GNyHs0pgLSkboc2W2HUT3Z6LrO_zi-wGbiBdu-4Ur-B7Am7j3gF2H1y04i6fW1dmsNxFqfNJGwB-m6wfjo7MthFt01Zg2wN2pjlH19lrNFtlyPX-fTZeZ5YzHTKpaMts0GyIKK7mQtoZCsZpZpsAyKUTTqEYYpjZ1CVap5LmUOSuJZXlt-Rg9Hs8Ovv_ZQ4h61-99lz5qSilXQhSEJooeKev7EDw0evDu2_hfTYk-RKcP0elDdPoUXdI8nS6bYE3beNNZF85CJqUSOVeJezhyDgDOa8k5Szb5P3HQdpQ</recordid><startdate>20121101</startdate><enddate>20121101</enddate><creator>Rodriguez, C.</creator><creator>Banobre-Lopez, M.</creator><creator>Kolen'ko, Y. V.</creator><creator>Rodriguez, B.</creator><creator>Freitas, P.</creator><creator>Rivas, J.</creator><general>IEEE</general><general>Institute of Electrical and Electronics Engineers</general><general>The Institute of Electrical and Electronics Engineers, Inc. (IEEE)</general><scope>97E</scope><scope>RIA</scope><scope>RIE</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20121101</creationdate><title>Magnetization Drop at High Temperature in Oleic Acid-Coated Magnetite Nanoparticles</title><author>Rodriguez, C. ; Banobre-Lopez, M. ; Kolen'ko, Y. V. ; Rodriguez, B. ; Freitas, P. ; Rivas, J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c323t-68d62cffb057c6356cde782d2c28ec2655ff8f5a28bd9ec88014964290c24dc3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Cross-disciplinary physics: materials science; rheology</topic><topic>Exact sciences and technology</topic><topic>Heating</topic><topic>Magnetic fields</topic><topic>Magnetic moments</topic><topic>Magnetic resonance imaging</topic><topic>Magnetic separation</topic><topic>Magnetism</topic><topic>Magnetite nanoparticles</topic><topic>Materials science</topic><topic>Nanoparticles</topic><topic>Other topics in materials science</topic><topic>Physics</topic><topic>Saturation magnetization</topic><topic>surface functionalization</topic><topic>surface spin disorder</topic><topic>Surface treatment</topic><toplevel>online_resources</toplevel><creatorcontrib>Rodriguez, C.</creatorcontrib><creatorcontrib>Banobre-Lopez, M.</creatorcontrib><creatorcontrib>Kolen'ko, Y. V.</creatorcontrib><creatorcontrib>Rodriguez, B.</creatorcontrib><creatorcontrib>Freitas, P.</creatorcontrib><creatorcontrib>Rivas, J.</creatorcontrib><collection>IEEE All-Society Periodicals Package (ASPP) 2005-present</collection><collection>IEEE All-Society Periodicals Package (ASPP) 1998-Present</collection><collection>IEEE Xplore</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>IEEE transactions on magnetics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Rodriguez, C.</au><au>Banobre-Lopez, M.</au><au>Kolen'ko, Y. V.</au><au>Rodriguez, B.</au><au>Freitas, P.</au><au>Rivas, J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Magnetization Drop at High Temperature in Oleic Acid-Coated Magnetite Nanoparticles</atitle><jtitle>IEEE transactions on magnetics</jtitle><stitle>TMAG</stitle><date>2012-11-01</date><risdate>2012</risdate><volume>48</volume><issue>11</issue><spage>3307</spage><epage>3310</epage><pages>3307-3310</pages><issn>0018-9464</issn><eissn>1941-0069</eissn><coden>IEMGAQ</coden><abstract>In this work we report an irreversible behavior in the magnetization of oleic acid (OA)-coated magnetite nanoparticles (NPs) at high temperature. On one hand, when the sample is heated-up, an irreversible magnetization drop is observed at 550 K, while the Curie temperature (Tc ≈ 840 K) remains close to that of bulk magnetite. On the other hand, a significant reduction of the magnetic moment has been found after heating and cooling the sample above and below its Curie temperature, respectively. Both magnetic features have been also observed in other surface modified magnetite nanoparticles [e.g., polyvynil pyrrolidone (PVP)-coated]. However, no reduction of the magnetic moment upon a heating-cooling cycle has been found in ligand-free magnetite nanoparticles. This fact suggests that surface effects derived from the OA-coating could be the origin of such reduction of the magnetic moment, as a consequence of thermal decomposition of the organic layer surrounding the nanoparticle and the subsequent loss of the magnetic surface order. This feature could be an important factor for those applications requiring high temperatures.</abstract><cop>New York, NY</cop><pub>IEEE</pub><doi>10.1109/TMAG.2012.2194273</doi><tpages>4</tpages></addata></record> |
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| subjects | Cross-disciplinary physics: materials science rheology Exact sciences and technology Heating Magnetic fields Magnetic moments Magnetic resonance imaging Magnetic separation Magnetism Magnetite nanoparticles Materials science Nanoparticles Other topics in materials science Physics Saturation magnetization surface functionalization surface spin disorder Surface treatment |
| title | Magnetization Drop at High Temperature in Oleic Acid-Coated Magnetite Nanoparticles |
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