Evolution of magnetic order in mechanically alloyed Al–1 at%Fe
The evolution of ferromagnetic order in high-energy ball-milled Al–1 at% Fe before the onset of a considerable Fe–Al solid solution phase has been investigated using 57Fe Mössbauer and bulk magnetization studies. The unmilled sample does not exhibit bulk magnetic properties and an onset of bulk magn...
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| Veröffentlicht in: | Journal of magnetism and magnetic materials 2007-02, Vol.309 (1), p.153-159 |
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| container_title | Journal of magnetism and magnetic materials |
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| creator | Sebastian, Varkey Lakshmi, N. Venugopalan, K. |
| description | The evolution of ferromagnetic order in high-energy ball-milled Al–1
at% Fe before the onset of a considerable Fe–Al solid solution phase has been investigated using
57Fe Mössbauer and bulk magnetization studies. The unmilled sample does not exhibit bulk magnetic properties and an onset of bulk magnetization is observed only after 30
min of milling, when the grain size becomes comparable to the ferromagnetic exchange length. The Curie temperatures of all the samples are less than that of pure iron. The reduction in grain size is accompanied by an increase in coercivity and reduced remanence and a decrease in
T
C. The effective magnetic moment per iron atom decreases with the development of a non-magnetic, Al-rich Fe–Al solution on longer milling. The clustering of Fe at grain boundaries is responsible for the observed bulk magnetic ordering. The systematic variation of the magnetic properties has been qualitatively correlated with the evolution of microstructure, reduction in grain size and enhanced inter-granular exchange coupling. |
| doi_str_mv | 10.1016/j.jmmm.2006.06.026 |
| format | Article |
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at% Fe before the onset of a considerable Fe–Al solid solution phase has been investigated using
57Fe Mössbauer and bulk magnetization studies. The unmilled sample does not exhibit bulk magnetic properties and an onset of bulk magnetization is observed only after 30
min of milling, when the grain size becomes comparable to the ferromagnetic exchange length. The Curie temperatures of all the samples are less than that of pure iron. The reduction in grain size is accompanied by an increase in coercivity and reduced remanence and a decrease in
T
C. The effective magnetic moment per iron atom decreases with the development of a non-magnetic, Al-rich Fe–Al solution on longer milling. The clustering of Fe at grain boundaries is responsible for the observed bulk magnetic ordering. The systematic variation of the magnetic properties has been qualitatively correlated with the evolution of microstructure, reduction in grain size and enhanced inter-granular exchange coupling.</description><identifier>ISSN: 0304-8853</identifier><identifier>DOI: 10.1016/j.jmmm.2006.06.026</identifier><identifier>CODEN: JMMMDC</identifier><language>eng</language><publisher>Amsterdam: Elsevier B.V</publisher><subject>57Fe Mössbauer ; Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Exact sciences and technology ; Magnetic properties ; Magnetic properties and materials ; Mechanical alloying ; Physics ; Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)</subject><ispartof>Journal of magnetism and magnetic materials, 2007-02, Vol.309 (1), p.153-159</ispartof><rights>2006 Elsevier B.V.</rights><rights>2007 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.jmmm.2006.06.026$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=18401124$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Sebastian, Varkey</creatorcontrib><creatorcontrib>Lakshmi, N.</creatorcontrib><creatorcontrib>Venugopalan, K.</creatorcontrib><title>Evolution of magnetic order in mechanically alloyed Al–1 at%Fe</title><title>Journal of magnetism and magnetic materials</title><description>The evolution of ferromagnetic order in high-energy ball-milled Al–1
at% Fe before the onset of a considerable Fe–Al solid solution phase has been investigated using
57Fe Mössbauer and bulk magnetization studies. The unmilled sample does not exhibit bulk magnetic properties and an onset of bulk magnetization is observed only after 30
min of milling, when the grain size becomes comparable to the ferromagnetic exchange length. The Curie temperatures of all the samples are less than that of pure iron. The reduction in grain size is accompanied by an increase in coercivity and reduced remanence and a decrease in
T
C. The effective magnetic moment per iron atom decreases with the development of a non-magnetic, Al-rich Fe–Al solution on longer milling. The clustering of Fe at grain boundaries is responsible for the observed bulk magnetic ordering. The systematic variation of the magnetic properties has been qualitatively correlated with the evolution of microstructure, reduction in grain size and enhanced inter-granular exchange coupling.</description><subject>57Fe Mössbauer</subject><subject>Condensed matter: electronic structure, electrical, magnetic, and optical properties</subject><subject>Exact sciences and technology</subject><subject>Magnetic properties</subject><subject>Magnetic properties and materials</subject><subject>Mechanical alloying</subject><subject>Physics</subject><subject>Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)</subject><issn>0304-8853</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2007</creationdate><recordtype>article</recordtype><recordid>eNqNkE1OwzAQhb0AifJzAVbelF2CPXYcR2JBVbWAVIkNrC3XmYKjJC5xWqk77sANOQmJ2gMgPc1sPj3pfYTccpZyxtV9lVZN06TAmErHgDojEyaYTLTOxAW5jLFijHGp1YQ8Lvah3vU-tDRsaGM_Wuy9o6ErsaO-pQ26T9t6Z-v6QIcTDljSWf37_cOp7adLvCbnG1tHvDn9K_K-XLzNn5PV69PLfLZKUDDWJ5DnwEEjd2sF4EpUgFpkGaDlkutMFbm2iJKDKNYCJVs7LkThNEgJucjEFbk79m678LXD2JvGR4d1bVsMu2igyHKt_wNqrXMAPoDTE2jjsG_T2db5aLadb2x3MFxLxjnIgXs4cjjM23vsTHQeW4el79D1pgzecGZG96Yyo3szujdjQIk_OGN5WA</recordid><startdate>20070201</startdate><enddate>20070201</enddate><creator>Sebastian, Varkey</creator><creator>Lakshmi, N.</creator><creator>Venugopalan, K.</creator><general>Elsevier B.V</general><general>Elsevier Science</general><scope>IQODW</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>7QF</scope><scope>7U5</scope><scope>L7M</scope></search><sort><creationdate>20070201</creationdate><title>Evolution of magnetic order in mechanically alloyed Al–1 at%Fe</title><author>Sebastian, Varkey ; Lakshmi, N. ; Venugopalan, K.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-e300t-2772128e1cb622cde62e83552ea141856978aee41239b3e40bc1339c824427353</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2007</creationdate><topic>57Fe Mössbauer</topic><topic>Condensed matter: electronic structure, electrical, magnetic, and optical properties</topic><topic>Exact sciences and technology</topic><topic>Magnetic properties</topic><topic>Magnetic properties and materials</topic><topic>Mechanical alloying</topic><topic>Physics</topic><topic>Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sebastian, Varkey</creatorcontrib><creatorcontrib>Lakshmi, N.</creatorcontrib><creatorcontrib>Venugopalan, K.</creatorcontrib><collection>Pascal-Francis</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Aluminium Industry Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of magnetism and magnetic materials</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Sebastian, Varkey</au><au>Lakshmi, N.</au><au>Venugopalan, K.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Evolution of magnetic order in mechanically alloyed Al–1 at%Fe</atitle><jtitle>Journal of magnetism and magnetic materials</jtitle><date>2007-02-01</date><risdate>2007</risdate><volume>309</volume><issue>1</issue><spage>153</spage><epage>159</epage><pages>153-159</pages><issn>0304-8853</issn><coden>JMMMDC</coden><abstract>The evolution of ferromagnetic order in high-energy ball-milled Al–1
at% Fe before the onset of a considerable Fe–Al solid solution phase has been investigated using
57Fe Mössbauer and bulk magnetization studies. The unmilled sample does not exhibit bulk magnetic properties and an onset of bulk magnetization is observed only after 30
min of milling, when the grain size becomes comparable to the ferromagnetic exchange length. The Curie temperatures of all the samples are less than that of pure iron. The reduction in grain size is accompanied by an increase in coercivity and reduced remanence and a decrease in
T
C. The effective magnetic moment per iron atom decreases with the development of a non-magnetic, Al-rich Fe–Al solution on longer milling. The clustering of Fe at grain boundaries is responsible for the observed bulk magnetic ordering. The systematic variation of the magnetic properties has been qualitatively correlated with the evolution of microstructure, reduction in grain size and enhanced inter-granular exchange coupling.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><doi>10.1016/j.jmmm.2006.06.026</doi><tpages>7</tpages></addata></record> |
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| subjects | 57Fe Mössbauer Condensed matter: electronic structure, electrical, magnetic, and optical properties Exact sciences and technology Magnetic properties Magnetic properties and materials Mechanical alloying Physics Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.) |
| title | Evolution of magnetic order in mechanically alloyed Al–1 at%Fe |
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