Local spin reversal and associated magnetic responses in Ga-substituted Pb-hexaferrites
We have studied magnetic structure and properties of Ga-substituted Pb-hexaferrites having the stoichiometry of PbFe12−xGaxO19 with x=6 (i.e., Fe:Ga=1:1). According to the neutron diffraction results, this compound is characterized by a collinear spin structure below its Curie temperature (∼325K). A...
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| Veröffentlicht in: | Journal of magnetism and magnetic materials 2012-09, Vol.324 (18), p.2866-2870 |
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| container_title | Journal of magnetism and magnetic materials |
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| creator | Na, Eun Hye Lee, Jung-Hoon Ahn, Suk-Jin Hong, Kun-Pyo Koo, Yang Mo Jang, Hyun Myung |
| description | We have studied magnetic structure and properties of Ga-substituted Pb-hexaferrites having the stoichiometry of PbFe12−xGaxO19 with x=6 (i.e., Fe:Ga=1:1). According to the neutron diffraction results, this compound is characterized by a collinear spin structure below its Curie temperature (∼325K). Analysis of the neutron diffraction patterns further indicates that the magnetic-moment direction of Fe3+ ions located at the octahedral 2a sublattice is downward while that of the unsubstituted PbFe12O19 is upward at room temperature. With decreasing temperature, the Fe3+ magnetic moment at the octahedral 2a sublattice undergoes a reorientation to the upward direction while that of the unsubstituted PbFe12O19 remains upward down to 5K. This selective local spin reversal at the 2a sublattice of PbFe6Ga6O19 was attributed to the weakening of the superexchange interaction between the octahedral 2a site and the tetrahedral 4fIV site upon the preferential substitution of Ga ions for Fe ions at these two neighboring sites. Comparison of the neutron diffraction results with dc magnetization responses and ac susceptibilities further indicates that the paramagnetic–ferrimagnetic transition at ∼325K (Tc) is followed by the local spin reversal at lower temperatures.
► The Fe3+ spin moment at 2a site undergoes switching in its direction with temperature. ► The weakening of superexchange interaction is caused by substitution of Ga ions. ► The selective local spin reversal is correlated with the broad ac susceptibility response. ► The PM–FM transition (at ∼325K) is followed by the local spin reversal at lower temperature. |
| doi_str_mv | 10.1016/j.jmmm.2012.04.031 |
| format | Article |
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► The Fe3+ spin moment at 2a site undergoes switching in its direction with temperature. ► The weakening of superexchange interaction is caused by substitution of Ga ions. ► The selective local spin reversal is correlated with the broad ac susceptibility response. ► The PM–FM transition (at ∼325K) is followed by the local spin reversal at lower temperature.</description><identifier>ISSN: 0304-8853</identifier><identifier>DOI: 10.1016/j.jmmm.2012.04.031</identifier><identifier>CODEN: JMMMDC</identifier><language>eng</language><publisher>Amsterdam: Elsevier B.V</publisher><subject>Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Curie temperature ; Domain effects, magnetization curves, and hysteresis ; Exact sciences and technology ; Exchange and superexchange interactions ; Ferrimagnetic ; Ferrimagnetics ; Gallium ; Iron ; Lead (metal) ; Magnetic properties and materials ; Magnetic structure ; Magnetic susceptibility ; Magnetically ordered materials: other intrinsic properties ; Magnetization ; Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects ; Neutron diffraction ; Physics ; Saturation moments and magnetic susceptibilities ; Spin arrangement ; Stoichiometry ; Studies of specific magnetic materials</subject><ispartof>Journal of magnetism and magnetic materials, 2012-09, Vol.324 (18), p.2866-2870</ispartof><rights>2012 Elsevier B.V.</rights><rights>2015 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c396t-9e37bf62383294166cd0b26f4e92185acba044435ab8993d3b235f914e1ec45c3</citedby><cites>FETCH-LOGICAL-c396t-9e37bf62383294166cd0b26f4e92185acba044435ab8993d3b235f914e1ec45c3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0304885312003782$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65306</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=26011265$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Na, Eun Hye</creatorcontrib><creatorcontrib>Lee, Jung-Hoon</creatorcontrib><creatorcontrib>Ahn, Suk-Jin</creatorcontrib><creatorcontrib>Hong, Kun-Pyo</creatorcontrib><creatorcontrib>Koo, Yang Mo</creatorcontrib><creatorcontrib>Jang, Hyun Myung</creatorcontrib><title>Local spin reversal and associated magnetic responses in Ga-substituted Pb-hexaferrites</title><title>Journal of magnetism and magnetic materials</title><description>We have studied magnetic structure and properties of Ga-substituted Pb-hexaferrites having the stoichiometry of PbFe12−xGaxO19 with x=6 (i.e., Fe:Ga=1:1). According to the neutron diffraction results, this compound is characterized by a collinear spin structure below its Curie temperature (∼325K). Analysis of the neutron diffraction patterns further indicates that the magnetic-moment direction of Fe3+ ions located at the octahedral 2a sublattice is downward while that of the unsubstituted PbFe12O19 is upward at room temperature. With decreasing temperature, the Fe3+ magnetic moment at the octahedral 2a sublattice undergoes a reorientation to the upward direction while that of the unsubstituted PbFe12O19 remains upward down to 5K. This selective local spin reversal at the 2a sublattice of PbFe6Ga6O19 was attributed to the weakening of the superexchange interaction between the octahedral 2a site and the tetrahedral 4fIV site upon the preferential substitution of Ga ions for Fe ions at these two neighboring sites. Comparison of the neutron diffraction results with dc magnetization responses and ac susceptibilities further indicates that the paramagnetic–ferrimagnetic transition at ∼325K (Tc) is followed by the local spin reversal at lower temperatures.
► The Fe3+ spin moment at 2a site undergoes switching in its direction with temperature. ► The weakening of superexchange interaction is caused by substitution of Ga ions. ► The selective local spin reversal is correlated with the broad ac susceptibility response. ► The PM–FM transition (at ∼325K) is followed by the local spin reversal at lower temperature.</description><subject>Condensed matter: electronic structure, electrical, magnetic, and optical properties</subject><subject>Curie temperature</subject><subject>Domain effects, magnetization curves, and hysteresis</subject><subject>Exact sciences and technology</subject><subject>Exchange and superexchange interactions</subject><subject>Ferrimagnetic</subject><subject>Ferrimagnetics</subject><subject>Gallium</subject><subject>Iron</subject><subject>Lead (metal)</subject><subject>Magnetic properties and materials</subject><subject>Magnetic structure</subject><subject>Magnetic susceptibility</subject><subject>Magnetically ordered materials: other intrinsic properties</subject><subject>Magnetization</subject><subject>Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects</subject><subject>Neutron diffraction</subject><subject>Physics</subject><subject>Saturation moments and magnetic susceptibilities</subject><subject>Spin arrangement</subject><subject>Stoichiometry</subject><subject>Studies of specific magnetic materials</subject><issn>0304-8853</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNqFkD1LxEAQhlMoeJ7-Aas0gk3ifl8CNnLoKRxooVgum81EN-TLneTQf--GOyy1Ggae953hiaILSlJKqLqu07pt25QRylIiUsLpUbQgnIgkyyQ_iU4Ra0IIFZlaRG_b3pomxsF1sYcdeAyb6crYIPbWmRHKuDXvHYzOBgCHvkPAONAbk-BU4OjGaYaei-QDvkwF3rsR8Cw6rkyDcH6Yy-j1_u5l_ZBsnzaP69ttYnmuxiQHvioqxXjGWS6oUrYkBVOVgJzRTBpbGCKE4NIUWZ7zkheMyyqnAihYIS1fRlf73sH3nxPgqFuHFprGdNBPqOlKcskpZfx_lPCMCRkOB5TtUet7RA-VHrxrjf8OkJ4l61rPkvUsWROhg-QQujz0GwxOK2866_A3yRQJbygZuJs9B8HLzoHXaB10FkrnwY667N1fZ34ADyyUKQ</recordid><startdate>20120901</startdate><enddate>20120901</enddate><creator>Na, Eun Hye</creator><creator>Lee, Jung-Hoon</creator><creator>Ahn, Suk-Jin</creator><creator>Hong, Kun-Pyo</creator><creator>Koo, Yang Mo</creator><creator>Jang, Hyun Myung</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7U5</scope><scope>8FD</scope><scope>L7M</scope><scope>7SR</scope><scope>8BQ</scope><scope>JG9</scope></search><sort><creationdate>20120901</creationdate><title>Local spin reversal and associated magnetic responses in Ga-substituted Pb-hexaferrites</title><author>Na, Eun Hye ; Lee, Jung-Hoon ; Ahn, Suk-Jin ; Hong, Kun-Pyo ; Koo, Yang Mo ; Jang, Hyun Myung</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c396t-9e37bf62383294166cd0b26f4e92185acba044435ab8993d3b235f914e1ec45c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Condensed matter: electronic structure, electrical, magnetic, and optical properties</topic><topic>Curie temperature</topic><topic>Domain effects, magnetization curves, and hysteresis</topic><topic>Exact sciences and technology</topic><topic>Exchange and superexchange interactions</topic><topic>Ferrimagnetic</topic><topic>Ferrimagnetics</topic><topic>Gallium</topic><topic>Iron</topic><topic>Lead (metal)</topic><topic>Magnetic properties and materials</topic><topic>Magnetic structure</topic><topic>Magnetic susceptibility</topic><topic>Magnetically ordered materials: other intrinsic properties</topic><topic>Magnetization</topic><topic>Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects</topic><topic>Neutron diffraction</topic><topic>Physics</topic><topic>Saturation moments and magnetic susceptibilities</topic><topic>Spin arrangement</topic><topic>Stoichiometry</topic><topic>Studies of specific magnetic materials</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Na, Eun Hye</creatorcontrib><creatorcontrib>Lee, Jung-Hoon</creatorcontrib><creatorcontrib>Ahn, Suk-Jin</creatorcontrib><creatorcontrib>Hong, Kun-Pyo</creatorcontrib><creatorcontrib>Koo, Yang Mo</creatorcontrib><creatorcontrib>Jang, Hyun Myung</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Engineered Materials Abstracts</collection><collection>METADEX</collection><collection>Materials Research Database</collection><jtitle>Journal of magnetism and magnetic materials</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Na, Eun Hye</au><au>Lee, Jung-Hoon</au><au>Ahn, Suk-Jin</au><au>Hong, Kun-Pyo</au><au>Koo, Yang Mo</au><au>Jang, Hyun Myung</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Local spin reversal and associated magnetic responses in Ga-substituted Pb-hexaferrites</atitle><jtitle>Journal of magnetism and magnetic materials</jtitle><date>2012-09-01</date><risdate>2012</risdate><volume>324</volume><issue>18</issue><spage>2866</spage><epage>2870</epage><pages>2866-2870</pages><issn>0304-8853</issn><coden>JMMMDC</coden><abstract>We have studied magnetic structure and properties of Ga-substituted Pb-hexaferrites having the stoichiometry of PbFe12−xGaxO19 with x=6 (i.e., Fe:Ga=1:1). According to the neutron diffraction results, this compound is characterized by a collinear spin structure below its Curie temperature (∼325K). Analysis of the neutron diffraction patterns further indicates that the magnetic-moment direction of Fe3+ ions located at the octahedral 2a sublattice is downward while that of the unsubstituted PbFe12O19 is upward at room temperature. With decreasing temperature, the Fe3+ magnetic moment at the octahedral 2a sublattice undergoes a reorientation to the upward direction while that of the unsubstituted PbFe12O19 remains upward down to 5K. This selective local spin reversal at the 2a sublattice of PbFe6Ga6O19 was attributed to the weakening of the superexchange interaction between the octahedral 2a site and the tetrahedral 4fIV site upon the preferential substitution of Ga ions for Fe ions at these two neighboring sites. Comparison of the neutron diffraction results with dc magnetization responses and ac susceptibilities further indicates that the paramagnetic–ferrimagnetic transition at ∼325K (Tc) is followed by the local spin reversal at lower temperatures.
► The Fe3+ spin moment at 2a site undergoes switching in its direction with temperature. ► The weakening of superexchange interaction is caused by substitution of Ga ions. ► The selective local spin reversal is correlated with the broad ac susceptibility response. ► The PM–FM transition (at ∼325K) is followed by the local spin reversal at lower temperature.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><doi>10.1016/j.jmmm.2012.04.031</doi><tpages>5</tpages></addata></record> |
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| subjects | Condensed matter: electronic structure, electrical, magnetic, and optical properties Curie temperature Domain effects, magnetization curves, and hysteresis Exact sciences and technology Exchange and superexchange interactions Ferrimagnetic Ferrimagnetics Gallium Iron Lead (metal) Magnetic properties and materials Magnetic structure Magnetic susceptibility Magnetically ordered materials: other intrinsic properties Magnetization Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects Neutron diffraction Physics Saturation moments and magnetic susceptibilities Spin arrangement Stoichiometry Studies of specific magnetic materials |
| title | Local spin reversal and associated magnetic responses in Ga-substituted Pb-hexaferrites |
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