Large Barkhausen jumps observed in Nd-Fe-B sintered magnets at very low temperatures
The demagnetization process for Nd/sub 15/Fe/sub 77/B/sub 8/ sintered magnets was studied by precise loop measurements below 50 K. A zigzag variation of coercivity with temperature was observed below about 18 K. In this temperature range, the magnetization reverses with large discontinuous magnetiza...
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| Veröffentlicht in: | IEEE (Institute of Electrical and Electronics Engineers) Transactions on Magnetics; (USA) 1989-09, Vol.25 (5), p.3431-3433 |
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| container_title | IEEE (Institute of Electrical and Electronics Engineers) Transactions on Magnetics; (USA) |
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| creator | Otani, Y. Miyajima, H. Chikazumi, S. |
| description | The demagnetization process for Nd/sub 15/Fe/sub 77/B/sub 8/ sintered magnets was studied by precise loop measurements below 50 K. A zigzag variation of coercivity with temperature was observed below about 18 K. In this temperature range, the magnetization reverses with large discontinuous magnetization jumps. The origin of the jumps, which are caused by the sudden growth of residual reversed magnetic domains pinned at some defects, was investigated by measuring hysteresis loops at very low temperatures and analyzing them from the viewpoint of domain-wall nucleation and propagation. The temperature of 18 K coincides with the Curie temperature of the B-rich Nd/sub 1.11/Fe/sub 4/B/sub 4/ phase segregated in the Nd/sub 15/Fe/sub 77/B/sub 8/ magnet. This behavior may be related to the soft magnetic properties of the B-rich phase and the demagnetizing field in the magnet.< > |
| doi_str_mv | 10.1109/20.42325 |
| format | Article |
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A zigzag variation of coercivity with temperature was observed below about 18 K. In this temperature range, the magnetization reverses with large discontinuous magnetization jumps. The origin of the jumps, which are caused by the sudden growth of residual reversed magnetic domains pinned at some defects, was investigated by measuring hysteresis loops at very low temperatures and analyzing them from the viewpoint of domain-wall nucleation and propagation. The temperature of 18 K coincides with the Curie temperature of the B-rich Nd/sub 1.11/Fe/sub 4/B/sub 4/ phase segregated in the Nd/sub 15/Fe/sub 77/B/sub 8/ magnet. This behavior may be related to the soft magnetic properties of the B-rich phase and the demagnetizing field in the magnet.< ></description><identifier>ISSN: 0018-9464</identifier><identifier>EISSN: 1941-0069</identifier><identifier>DOI: 10.1109/20.42325</identifier><identifier>CODEN: IEMGAQ</identifier><language>eng</language><publisher>United States: IEEE</publisher><subject>360102 - Metals & Alloys- Structure & Phase Studies ; 360104 - Metals & Alloys- Physical Properties ; ALLOYS ; BORON ALLOYS ; COERCIVE FORCE ; CURIE POINT ; DEMAGNETIZATION ; Iron ; IRON ALLOYS ; Magnetic domains ; Magnetic hysteresis ; MAGNETIC PROPERTIES ; MAGNETIZATION ; MAGNETS ; MATERIALS SCIENCE ; Neodymium ; NEODYMIUM ALLOYS ; Nuclear measurements ; PHASE STUDIES ; PHYSICAL PROPERTIES ; RARE EARTH ALLOYS ; Temperature distribution ; THERMODYNAMIC PROPERTIES ; TRANSITION TEMPERATURE ; VARIATIONS ; VERY LOW TEMPERATURE</subject><ispartof>IEEE (Institute of Electrical and Electronics Engineers) Transactions on Magnetics; (USA), 1989-09, Vol.25 (5), p.3431-3433</ispartof><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c332t-a7be6264fa69084e8179a930925f9c2765d36bac41bb5e83804cf9771959114e3</citedby><cites>FETCH-LOGICAL-c332t-a7be6264fa69084e8179a930925f9c2765d36bac41bb5e83804cf9771959114e3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://ieeexplore.ieee.org/document/42325$$EHTML$$P50$$Gieee$$H</linktohtml><link.rule.ids>230,309,310,314,780,784,789,790,796,885,23930,23931,25140,27924,27925,54758</link.rule.ids><linktorsrc>$$Uhttps://ieeexplore.ieee.org/document/42325$$EView_record_in_IEEE$$FView_record_in_$$GIEEE</linktorsrc><backlink>$$Uhttps://www.osti.gov/biblio/5180762$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Otani, Y.</creatorcontrib><creatorcontrib>Miyajima, H.</creatorcontrib><creatorcontrib>Chikazumi, S.</creatorcontrib><title>Large Barkhausen jumps observed in Nd-Fe-B sintered magnets at very low temperatures</title><title>IEEE (Institute of Electrical and Electronics Engineers) Transactions on Magnetics; (USA)</title><addtitle>TMAG</addtitle><description>The demagnetization process for Nd/sub 15/Fe/sub 77/B/sub 8/ sintered magnets was studied by precise loop measurements below 50 K. A zigzag variation of coercivity with temperature was observed below about 18 K. In this temperature range, the magnetization reverses with large discontinuous magnetization jumps. The origin of the jumps, which are caused by the sudden growth of residual reversed magnetic domains pinned at some defects, was investigated by measuring hysteresis loops at very low temperatures and analyzing them from the viewpoint of domain-wall nucleation and propagation. The temperature of 18 K coincides with the Curie temperature of the B-rich Nd/sub 1.11/Fe/sub 4/B/sub 4/ phase segregated in the Nd/sub 15/Fe/sub 77/B/sub 8/ magnet. This behavior may be related to the soft magnetic properties of the B-rich phase and the demagnetizing field in the magnet.< ></description><subject>360102 - Metals & Alloys- Structure & Phase Studies</subject><subject>360104 - Metals & Alloys- Physical Properties</subject><subject>ALLOYS</subject><subject>BORON ALLOYS</subject><subject>COERCIVE FORCE</subject><subject>CURIE POINT</subject><subject>DEMAGNETIZATION</subject><subject>Iron</subject><subject>IRON ALLOYS</subject><subject>Magnetic domains</subject><subject>Magnetic hysteresis</subject><subject>MAGNETIC PROPERTIES</subject><subject>MAGNETIZATION</subject><subject>MAGNETS</subject><subject>MATERIALS SCIENCE</subject><subject>Neodymium</subject><subject>NEODYMIUM ALLOYS</subject><subject>Nuclear measurements</subject><subject>PHASE STUDIES</subject><subject>PHYSICAL PROPERTIES</subject><subject>RARE EARTH ALLOYS</subject><subject>Temperature distribution</subject><subject>THERMODYNAMIC PROPERTIES</subject><subject>TRANSITION TEMPERATURE</subject><subject>VARIATIONS</subject><subject>VERY LOW TEMPERATURE</subject><issn>0018-9464</issn><issn>1941-0069</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1989</creationdate><recordtype>article</recordtype><recordid>eNqN0T1PwzAQBmALgUQpSKxsFgNiSfFXHHukFQWkCpYyW457aVPyUWynqP-eQBAz0-nufXTLi9AlJRNKib5jZCIYZ-kRGlEtaEKI1MdoRAhViRZSnKKzELb9KlJKRmi5sH4NeGr9-8Z2ARq87epdwG0ewO9hhcsGv6ySOSRTHMomgu9vtV03EAO2Ee_BH3DVfuII9Q68jZ2HcI5OClsFuPidY_Q2f1jOnpLF6-Pz7H6ROM5ZTGyWg2RSFFZqogQommmrOdEsLbRjmUxXXObWCZrnKSiuiHCFzjKqU02pAD5G18PfNsTSBFdGcBvXNg24aFKqSCZZj24GtPPtRwchmroMDqrKNtB2wTCVaam1_gfkVChJeng7QOfbEDwUZufL2vqDocR8l2AYMT8l9PRqoCUA_LEh-wJ4aH9U</recordid><startdate>19890901</startdate><enddate>19890901</enddate><creator>Otani, Y.</creator><creator>Miyajima, H.</creator><creator>Chikazumi, S.</creator><general>IEEE</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>8FD</scope><scope>L7M</scope><scope>8BQ</scope><scope>JG9</scope><scope>OTOTI</scope></search><sort><creationdate>19890901</creationdate><title>Large Barkhausen jumps observed in Nd-Fe-B sintered magnets at very low temperatures</title><author>Otani, Y. ; Miyajima, H. ; Chikazumi, S.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c332t-a7be6264fa69084e8179a930925f9c2765d36bac41bb5e83804cf9771959114e3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1989</creationdate><topic>360102 - Metals & Alloys- Structure & Phase Studies</topic><topic>360104 - Metals & Alloys- Physical Properties</topic><topic>ALLOYS</topic><topic>BORON ALLOYS</topic><topic>COERCIVE FORCE</topic><topic>CURIE POINT</topic><topic>DEMAGNETIZATION</topic><topic>Iron</topic><topic>IRON ALLOYS</topic><topic>Magnetic domains</topic><topic>Magnetic hysteresis</topic><topic>MAGNETIC PROPERTIES</topic><topic>MAGNETIZATION</topic><topic>MAGNETS</topic><topic>MATERIALS SCIENCE</topic><topic>Neodymium</topic><topic>NEODYMIUM ALLOYS</topic><topic>Nuclear measurements</topic><topic>PHASE STUDIES</topic><topic>PHYSICAL PROPERTIES</topic><topic>RARE EARTH ALLOYS</topic><topic>Temperature distribution</topic><topic>THERMODYNAMIC PROPERTIES</topic><topic>TRANSITION TEMPERATURE</topic><topic>VARIATIONS</topic><topic>VERY LOW TEMPERATURE</topic><toplevel>online_resources</toplevel><creatorcontrib>Otani, Y.</creatorcontrib><creatorcontrib>Miyajima, H.</creatorcontrib><creatorcontrib>Chikazumi, S.</creatorcontrib><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>METADEX</collection><collection>Materials Research Database</collection><collection>OSTI.GOV</collection><jtitle>IEEE (Institute of Electrical and Electronics Engineers) Transactions on Magnetics; (USA)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Otani, Y.</au><au>Miyajima, H.</au><au>Chikazumi, S.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Large Barkhausen jumps observed in Nd-Fe-B sintered magnets at very low temperatures</atitle><jtitle>IEEE (Institute of Electrical and Electronics Engineers) Transactions on Magnetics; (USA)</jtitle><stitle>TMAG</stitle><date>1989-09-01</date><risdate>1989</risdate><volume>25</volume><issue>5</issue><spage>3431</spage><epage>3433</epage><pages>3431-3433</pages><issn>0018-9464</issn><eissn>1941-0069</eissn><coden>IEMGAQ</coden><abstract>The demagnetization process for Nd/sub 15/Fe/sub 77/B/sub 8/ sintered magnets was studied by precise loop measurements below 50 K. A zigzag variation of coercivity with temperature was observed below about 18 K. In this temperature range, the magnetization reverses with large discontinuous magnetization jumps. The origin of the jumps, which are caused by the sudden growth of residual reversed magnetic domains pinned at some defects, was investigated by measuring hysteresis loops at very low temperatures and analyzing them from the viewpoint of domain-wall nucleation and propagation. The temperature of 18 K coincides with the Curie temperature of the B-rich Nd/sub 1.11/Fe/sub 4/B/sub 4/ phase segregated in the Nd/sub 15/Fe/sub 77/B/sub 8/ magnet. This behavior may be related to the soft magnetic properties of the B-rich phase and the demagnetizing field in the magnet.< ></abstract><cop>United States</cop><pub>IEEE</pub><doi>10.1109/20.42325</doi><tpages>3</tpages></addata></record> |
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| issn | 0018-9464 1941-0069 |
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| subjects | 360102 - Metals & Alloys- Structure & Phase Studies 360104 - Metals & Alloys- Physical Properties ALLOYS BORON ALLOYS COERCIVE FORCE CURIE POINT DEMAGNETIZATION Iron IRON ALLOYS Magnetic domains Magnetic hysteresis MAGNETIC PROPERTIES MAGNETIZATION MAGNETS MATERIALS SCIENCE Neodymium NEODYMIUM ALLOYS Nuclear measurements PHASE STUDIES PHYSICAL PROPERTIES RARE EARTH ALLOYS Temperature distribution THERMODYNAMIC PROPERTIES TRANSITION TEMPERATURE VARIATIONS VERY LOW TEMPERATURE |
| title | Large Barkhausen jumps observed in Nd-Fe-B sintered magnets at very low temperatures |
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