Electric Field-Induced Modification of Magnetism in Thin-Film Ferromagnets
A large electric field at the surface of a ferromagnetic metal is expected to appreciably change its electron density. In particular, the metal's intrinsic magnetic properties, which are commonly regarded as fixed material constants, will be affected. This requires, however, that the surface ha...
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| Veröffentlicht in: | Science (American Association for the Advancement of Science) 2007-01, Vol.315 (5810), p.349-351 |
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| creator | Weisheit, Martin Fähler, Sebastian Marty, Alain Souche, Yves Poinsignon, Christiane Givord, Dominique |
| description | A large electric field at the surface of a ferromagnetic metal is expected to appreciably change its electron density. In particular, the metal's intrinsic magnetic properties, which are commonly regarded as fixed material constants, will be affected. This requires, however, that the surface has a strong influence on the material's properties, as is the case with ultrathin films. We demonstrated that the magnetocrystalline anisotropy of ordered iron-platinum (FePt) and iron-palladium (FePd) intermetallic compounds can be reversibly modified by an applied electric field when immersed in an electrolyte. A voltage change of -0.6 volts on 2-nanometer-thick films altered the coercivity by -4.5 and +1% in FePt and FePd, respectively. The modification of the magnetic parameters was attributed to a change in the number of unpaired d electrons in response to the applied electric field. Our device structure is general and should be applicable for characterization of other thin-film magnetic systems. |
| doi_str_mv | 10.1126/science.1136629 |
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In particular, the metal's intrinsic magnetic properties, which are commonly regarded as fixed material constants, will be affected. This requires, however, that the surface has a strong influence on the material's properties, as is the case with ultrathin films. We demonstrated that the magnetocrystalline anisotropy of ordered iron-platinum (FePt) and iron-palladium (FePd) intermetallic compounds can be reversibly modified by an applied electric field when immersed in an electrolyte. A voltage change of -0.6 volts on 2-nanometer-thick films altered the coercivity by -4.5 and +1% in FePt and FePd, respectively. The modification of the magnetic parameters was attributed to a change in the number of unpaired d electrons in response to the applied electric field. Our device structure is general and should be applicable for characterization of other thin-film magnetic systems.</description><identifier>ISSN: 0036-8075</identifier><identifier>EISSN: 1095-9203</identifier><identifier>DOI: 10.1126/science.1136629</identifier><identifier>PMID: 17234941</identifier><identifier>CODEN: SCIEAS</identifier><language>eng</language><publisher>Washington, DC: American Association for the Advancement of Science</publisher><subject>Anisotropy ; Coercivity ; Condensed Matter ; Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Devices ; Electric fields ; Electric potential ; Electrolytes ; Electrons ; Exact sciences and technology ; Ferromagnetism ; Ferrous alloys ; Intermetallics ; Iron compounds ; Magnetic fields ; Magnetic properties ; Magnetic properties and materials ; Magnetic properties of monolayers and thin films ; Magnetic properties of nanostructures ; Magnetic properties of surface, thin films and multilayers ; Magnetism ; Material films ; Materials ; Materials Science ; Metals ; Palladium compounds ; Physics ; Platinum compounds</subject><ispartof>Science (American Association for the Advancement of Science), 2007-01, Vol.315 (5810), p.349-351</ispartof><rights>Copyright 2007 American Association for the Advancement of Science</rights><rights>2007 INIST-CNRS</rights><rights>Copyright American Association for the Advancement of Science Jan 19, 2007</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c592t-1d64a133354d6c50330d60784405b0c2ce5bdaffcf3183e353f9e2f39b4f87363</citedby><cites>FETCH-LOGICAL-c592t-1d64a133354d6c50330d60784405b0c2ce5bdaffcf3183e353f9e2f39b4f87363</cites><orcidid>0000-0001-5709-6945</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.jstor.org/stable/pdf/20035247$$EPDF$$P50$$Gjstor$$H</linktopdf><linktohtml>$$Uhttps://www.jstor.org/stable/20035247$$EHTML$$P50$$Gjstor$$H</linktohtml><link.rule.ids>230,314,777,781,800,882,2871,2872,27905,27906,57998,58231</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=18473307$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/17234941$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink><backlink>$$Uhttps://hal.science/hal-00153072$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Weisheit, Martin</creatorcontrib><creatorcontrib>Fähler, Sebastian</creatorcontrib><creatorcontrib>Marty, Alain</creatorcontrib><creatorcontrib>Souche, Yves</creatorcontrib><creatorcontrib>Poinsignon, Christiane</creatorcontrib><creatorcontrib>Givord, Dominique</creatorcontrib><title>Electric Field-Induced Modification of Magnetism in Thin-Film Ferromagnets</title><title>Science (American Association for the Advancement of Science)</title><addtitle>Science</addtitle><description>A large electric field at the surface of a ferromagnetic metal is expected to appreciably change its electron density. In particular, the metal's intrinsic magnetic properties, which are commonly regarded as fixed material constants, will be affected. This requires, however, that the surface has a strong influence on the material's properties, as is the case with ultrathin films. We demonstrated that the magnetocrystalline anisotropy of ordered iron-platinum (FePt) and iron-palladium (FePd) intermetallic compounds can be reversibly modified by an applied electric field when immersed in an electrolyte. A voltage change of -0.6 volts on 2-nanometer-thick films altered the coercivity by -4.5 and +1% in FePt and FePd, respectively. The modification of the magnetic parameters was attributed to a change in the number of unpaired d electrons in response to the applied electric field. 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Science)</jtitle><addtitle>Science</addtitle><date>2007-01-19</date><risdate>2007</risdate><volume>315</volume><issue>5810</issue><spage>349</spage><epage>351</epage><pages>349-351</pages><issn>0036-8075</issn><eissn>1095-9203</eissn><coden>SCIEAS</coden><abstract>A large electric field at the surface of a ferromagnetic metal is expected to appreciably change its electron density. In particular, the metal's intrinsic magnetic properties, which are commonly regarded as fixed material constants, will be affected. This requires, however, that the surface has a strong influence on the material's properties, as is the case with ultrathin films. We demonstrated that the magnetocrystalline anisotropy of ordered iron-platinum (FePt) and iron-palladium (FePd) intermetallic compounds can be reversibly modified by an applied electric field when immersed in an electrolyte. A voltage change of -0.6 volts on 2-nanometer-thick films altered the coercivity by -4.5 and +1% in FePt and FePd, respectively. The modification of the magnetic parameters was attributed to a change in the number of unpaired d electrons in response to the applied electric field. Our device structure is general and should be applicable for characterization of other thin-film magnetic systems.</abstract><cop>Washington, DC</cop><pub>American Association for the Advancement of Science</pub><pmid>17234941</pmid><doi>10.1126/science.1136629</doi><tpages>3</tpages><orcidid>https://orcid.org/0000-0001-5709-6945</orcidid></addata></record> |
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| source | American Association for the Advancement of Science; Jstor Complete Legacy |
| subjects | Anisotropy Coercivity Condensed Matter Condensed matter: electronic structure, electrical, magnetic, and optical properties Devices Electric fields Electric potential Electrolytes Electrons Exact sciences and technology Ferromagnetism Ferrous alloys Intermetallics Iron compounds Magnetic fields Magnetic properties Magnetic properties and materials Magnetic properties of monolayers and thin films Magnetic properties of nanostructures Magnetic properties of surface, thin films and multilayers Magnetism Material films Materials Materials Science Metals Palladium compounds Physics Platinum compounds |
| title | Electric Field-Induced Modification of Magnetism in Thin-Film Ferromagnets |
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