Understanding of ferromagnetism in thiol capped Mn doped CdS nanocrystals
The evolution of ferromagnetism has been investigated in thiol (2-mercaptoethanol) capped Mn doped CdS nanoparticles synthesized at various temperatures by sol-gel reverse micelle mechanism. X-ray diffraction measurements reveal a structural phase transformation from wurtzite to zinc blende structur...
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| Veröffentlicht in: | Journal of applied physics 2013-09, Vol.114 (9) |
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| container_title | Journal of applied physics |
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| creator | Ghosh, Anirudha Paul, Sanhita Raj, Satyabrata |
| description | The evolution of ferromagnetism has been investigated in thiol (2-mercaptoethanol) capped Mn doped CdS nanoparticles synthesized at various temperatures by sol-gel reverse micelle mechanism. X-ray diffraction measurements reveal a structural phase transformation from wurtzite to zinc blende structure with the increase in synthesis temperature of Mn doped nanocryatals. Magnetic measurements suggest that the antiferromagnetic interactions of Mn2+ ions within Mn—cluster in Mn doped CdS nanocrystals synthesized at lower temperature (∼17 °C) reduce the total magnetic moment at ambient temperature. Whereas the isolated Mn2+ ions in nanocrystals synthesized above 70 °C enhance the magnetic moment due to the sp-d exchange interaction at ambient temperature. It has been observed that the magnetic moments in all samples synthesized at various temperatures do not saturate even at lowest temperature, 5 K. The core diamagnetism in doped nanocrystals synthesized at low temperature (∼17 °C) is mostly due to the presence of magnetic ions around the surface, whereas these ions exist randomly throughout the crystal for samples synthesized at high temperature (∼70 °C), as a result core diamagnetism vanishes. |
| doi_str_mv | 10.1063/1.4820258 |
| format | Article |
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X-ray diffraction measurements reveal a structural phase transformation from wurtzite to zinc blende structure with the increase in synthesis temperature of Mn doped nanocryatals. Magnetic measurements suggest that the antiferromagnetic interactions of Mn2+ ions within Mn—cluster in Mn doped CdS nanocrystals synthesized at lower temperature (∼17 °C) reduce the total magnetic moment at ambient temperature. Whereas the isolated Mn2+ ions in nanocrystals synthesized above 70 °C enhance the magnetic moment due to the sp-d exchange interaction at ambient temperature. It has been observed that the magnetic moments in all samples synthesized at various temperatures do not saturate even at lowest temperature, 5 K. The core diamagnetism in doped nanocrystals synthesized at low temperature (∼17 °C) is mostly due to the presence of magnetic ions around the surface, whereas these ions exist randomly throughout the crystal for samples synthesized at high temperature (∼70 °C), as a result core diamagnetism vanishes.</description><identifier>ISSN: 0021-8979</identifier><identifier>EISSN: 1089-7550</identifier><identifier>DOI: 10.1063/1.4820258</identifier><language>eng</language><subject>Cadmium sulfides ; Capping ; Diamagnetism ; Ferromagnetism ; Magnetic moment ; Manganese ; Nanocrystals ; Nanostructure</subject><ispartof>Journal of applied physics, 2013-09, Vol.114 (9)</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c262t-c16a96a910ebabbea2d987d604a3d6fdc32f82b442f86a9b6ba9dfb55e1d03a53</citedby><cites>FETCH-LOGICAL-c262t-c16a96a910ebabbea2d987d604a3d6fdc32f82b442f86a9b6ba9dfb55e1d03a53</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Ghosh, Anirudha</creatorcontrib><creatorcontrib>Paul, Sanhita</creatorcontrib><creatorcontrib>Raj, Satyabrata</creatorcontrib><title>Understanding of ferromagnetism in thiol capped Mn doped CdS nanocrystals</title><title>Journal of applied physics</title><description>The evolution of ferromagnetism has been investigated in thiol (2-mercaptoethanol) capped Mn doped CdS nanoparticles synthesized at various temperatures by sol-gel reverse micelle mechanism. X-ray diffraction measurements reveal a structural phase transformation from wurtzite to zinc blende structure with the increase in synthesis temperature of Mn doped nanocryatals. Magnetic measurements suggest that the antiferromagnetic interactions of Mn2+ ions within Mn—cluster in Mn doped CdS nanocrystals synthesized at lower temperature (∼17 °C) reduce the total magnetic moment at ambient temperature. Whereas the isolated Mn2+ ions in nanocrystals synthesized above 70 °C enhance the magnetic moment due to the sp-d exchange interaction at ambient temperature. It has been observed that the magnetic moments in all samples synthesized at various temperatures do not saturate even at lowest temperature, 5 K. The core diamagnetism in doped nanocrystals synthesized at low temperature (∼17 °C) is mostly due to the presence of magnetic ions around the surface, whereas these ions exist randomly throughout the crystal for samples synthesized at high temperature (∼70 °C), as a result core diamagnetism vanishes.</description><subject>Cadmium sulfides</subject><subject>Capping</subject><subject>Diamagnetism</subject><subject>Ferromagnetism</subject><subject>Magnetic moment</subject><subject>Manganese</subject><subject>Nanocrystals</subject><subject>Nanostructure</subject><issn>0021-8979</issn><issn>1089-7550</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNotkLtOwzAUQC0EEqEw8AceYUjxtfOwR1TxqFTEAJ0jP0tQYgc7Hfr3uGqlK507nHuHg9A9kCWQhj3BsuKU0JpfoAIIF2Vb1-QSFYRQKLloxTW6SemXEADORIHWW29sTLP0pvc7HBx2NsYwyp23c59G3Hs8__RhwFpOkzX4w2MTjsvKfGEvfdDxkM-HdIuuXIa9O3OBtq8v36v3cvP5tl49b0pNGzqXGhop8gCxSiplJTWCt6YhlWSmcUYz6jhVVZWRNdUoKYxTdW3BECZrtkAPp79TDH97m-Zu7JO2wyC9DfvUQVXxNheANquPJ1XHkFK0rptiP8p46IB0x1wddOdc7B9tA102</recordid><startdate>20130907</startdate><enddate>20130907</enddate><creator>Ghosh, Anirudha</creator><creator>Paul, Sanhita</creator><creator>Raj, Satyabrata</creator><scope>AAYXX</scope><scope>CITATION</scope><scope>7U5</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>20130907</creationdate><title>Understanding of ferromagnetism in thiol capped Mn doped CdS nanocrystals</title><author>Ghosh, Anirudha ; Paul, Sanhita ; Raj, Satyabrata</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c262t-c16a96a910ebabbea2d987d604a3d6fdc32f82b442f86a9b6ba9dfb55e1d03a53</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Cadmium sulfides</topic><topic>Capping</topic><topic>Diamagnetism</topic><topic>Ferromagnetism</topic><topic>Magnetic moment</topic><topic>Manganese</topic><topic>Nanocrystals</topic><topic>Nanostructure</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ghosh, Anirudha</creatorcontrib><creatorcontrib>Paul, Sanhita</creatorcontrib><creatorcontrib>Raj, Satyabrata</creatorcontrib><collection>CrossRef</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of applied physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ghosh, Anirudha</au><au>Paul, Sanhita</au><au>Raj, Satyabrata</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Understanding of ferromagnetism in thiol capped Mn doped CdS nanocrystals</atitle><jtitle>Journal of applied physics</jtitle><date>2013-09-07</date><risdate>2013</risdate><volume>114</volume><issue>9</issue><issn>0021-8979</issn><eissn>1089-7550</eissn><abstract>The evolution of ferromagnetism has been investigated in thiol (2-mercaptoethanol) capped Mn doped CdS nanoparticles synthesized at various temperatures by sol-gel reverse micelle mechanism. X-ray diffraction measurements reveal a structural phase transformation from wurtzite to zinc blende structure with the increase in synthesis temperature of Mn doped nanocryatals. Magnetic measurements suggest that the antiferromagnetic interactions of Mn2+ ions within Mn—cluster in Mn doped CdS nanocrystals synthesized at lower temperature (∼17 °C) reduce the total magnetic moment at ambient temperature. Whereas the isolated Mn2+ ions in nanocrystals synthesized above 70 °C enhance the magnetic moment due to the sp-d exchange interaction at ambient temperature. It has been observed that the magnetic moments in all samples synthesized at various temperatures do not saturate even at lowest temperature, 5 K. The core diamagnetism in doped nanocrystals synthesized at low temperature (∼17 °C) is mostly due to the presence of magnetic ions around the surface, whereas these ions exist randomly throughout the crystal for samples synthesized at high temperature (∼70 °C), as a result core diamagnetism vanishes.</abstract><doi>10.1063/1.4820258</doi></addata></record> |
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| source | American Institute of Physics (AIP) Journals; AIP Digital Archive; Alma/SFX Local Collection |
| subjects | Cadmium sulfides Capping Diamagnetism Ferromagnetism Magnetic moment Manganese Nanocrystals Nanostructure |
| title | Understanding of ferromagnetism in thiol capped Mn doped CdS nanocrystals |
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