Enhanced magnetoresistance by monoatomic roughness in epitaxial Fe/MgO/Fe tunnel junctions
Interfacial effects on spin and symmetry filtering in single-crystal Fe(001)/ MgO / Fe magnetic tunnel junctions are investigated with the insertion of a Fe monoatomic step at the bottom MgO interface. After annealing, the atomically flat bottom electrode is covered by a fractional part of a Fe mono...
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| Veröffentlicht in: | Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2015-05, Vol.91 (17), Article 174403 |
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| container_title | Physical review. B, Condensed matter and materials physics |
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| creator | Duluard, A. Bellouard, C. Lu, Y. Hehn, M. Lacour, D. Montaigne, F. Lengaigne, G. Andrieu, S. Bonell, F. Tiusan, C. |
| description | Interfacial effects on spin and symmetry filtering in single-crystal Fe(001)/ MgO / Fe magnetic tunnel junctions are investigated with the insertion of a Fe monoatomic step at the bottom MgO interface. After annealing, the atomically flat bottom electrode is covered by a fractional part of a Fe monoatomic layer resulting in two-dimensional Fe islands that are separated for low coverages and percolated above around half a monolayer. The magnetotransport properties of the junctions are studied as a function of this Fe sublayer coverage that is varied from 0 to 1 monolayer. Surprisingly, the magnetoresistance ratio exhibits a maximum for a coverage around half a monolayer. Tunneling spectroscopy experiments performed at low temperature allow relating this result to the decrease of the contribution of the interfacial resonance state to the conductance of the junction. |
| doi_str_mv | 10.1103/PhysRevB.91.174403 |
| format | Article |
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After annealing, the atomically flat bottom electrode is covered by a fractional part of a Fe monoatomic layer resulting in two-dimensional Fe islands that are separated for low coverages and percolated above around half a monolayer. The magnetotransport properties of the junctions are studied as a function of this Fe sublayer coverage that is varied from 0 to 1 monolayer. Surprisingly, the magnetoresistance ratio exhibits a maximum for a coverage around half a monolayer. Tunneling spectroscopy experiments performed at low temperature allow relating this result to the decrease of the contribution of the interfacial resonance state to the conductance of the junction.</description><identifier>ISSN: 1098-0121</identifier><identifier>EISSN: 1550-235X</identifier><identifier>DOI: 10.1103/PhysRevB.91.174403</identifier><language>eng</language><publisher>American Physical Society</publisher><subject>Condensed Matter ; Filtering ; Iron ; Magnesium oxide ; Magnetoresistance ; Magnetoresistivity ; Materials Science ; Monolayers ; Physics ; Tunnel junctions</subject><ispartof>Physical review. 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B, Condensed matter and materials physics</title><description>Interfacial effects on spin and symmetry filtering in single-crystal Fe(001)/ MgO / Fe magnetic tunnel junctions are investigated with the insertion of a Fe monoatomic step at the bottom MgO interface. After annealing, the atomically flat bottom electrode is covered by a fractional part of a Fe monoatomic layer resulting in two-dimensional Fe islands that are separated for low coverages and percolated above around half a monolayer. The magnetotransport properties of the junctions are studied as a function of this Fe sublayer coverage that is varied from 0 to 1 monolayer. Surprisingly, the magnetoresistance ratio exhibits a maximum for a coverage around half a monolayer. Tunneling spectroscopy experiments performed at low temperature allow relating this result to the decrease of the contribution of the interfacial resonance state to the conductance of the junction.</description><subject>Condensed Matter</subject><subject>Filtering</subject><subject>Iron</subject><subject>Magnesium oxide</subject><subject>Magnetoresistance</subject><subject>Magnetoresistivity</subject><subject>Materials Science</subject><subject>Monolayers</subject><subject>Physics</subject><subject>Tunnel junctions</subject><issn>1098-0121</issn><issn>1550-235X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><recordid>eNo9kEFLAzEUhBdRsFb_gKcc9bBtXpJ1k2Mt1gqViiiIl5BNX9uU3aRudov9926penkzDB8Db5LkGugAgPLhy3ofX3F3P1AwgFwIyk-SHmQZTRnPPk47T5VMKTA4Ty5i3FAKQgnWSz4f_Np4iwtSmZXHJtQYXWwOESn2pAo-mCZUzpI6tKu1xxiJ8wS3rjHfzpRkgsPn1Xw4QdK03mNJNq23jQs-XiZnS1NGvPrVfvI-eXgbT9PZ_PFpPJqlVtC8ScUdZ6agmBtZyAKUQLbIaWZUoYzIpURbWMUAsMgBlsAkRUutygx0JuOM95PbY-_alHpbu8rUex2M09PRTB-y7m0purODjr05sts6fLUYG125aLEsjcfQRg05SMUyzmWHsiNq6xBjjcv_bqD6MLr-G10r0MfR-Q_0QXcH</recordid><startdate>20150501</startdate><enddate>20150501</enddate><creator>Duluard, A.</creator><creator>Bellouard, C.</creator><creator>Lu, Y.</creator><creator>Hehn, M.</creator><creator>Lacour, D.</creator><creator>Montaigne, F.</creator><creator>Lengaigne, G.</creator><creator>Andrieu, S.</creator><creator>Bonell, F.</creator><creator>Tiusan, C.</creator><general>American Physical Society</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QF</scope><scope>7U5</scope><scope>8FD</scope><scope>H8D</scope><scope>JG9</scope><scope>L7M</scope><scope>1XC</scope><scope>VOOES</scope><orcidid>https://orcid.org/0000-0002-4240-5925</orcidid><orcidid>https://orcid.org/0000-0001-7296-0404</orcidid><orcidid>https://orcid.org/0000-0003-3337-8205</orcidid><orcidid>https://orcid.org/0000-0002-4137-0118</orcidid><orcidid>https://orcid.org/0000-0003-0373-8193</orcidid><orcidid>https://orcid.org/0000-0003-4010-9935</orcidid><orcidid>https://orcid.org/0000-0002-5871-8870</orcidid><orcidid>https://orcid.org/0000-0003-1338-3867</orcidid></search><sort><creationdate>20150501</creationdate><title>Enhanced magnetoresistance by monoatomic roughness in epitaxial Fe/MgO/Fe tunnel junctions</title><author>Duluard, A. ; Bellouard, C. ; Lu, Y. ; Hehn, M. ; Lacour, D. ; Montaigne, F. ; Lengaigne, G. ; Andrieu, S. ; Bonell, F. ; Tiusan, C.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c407t-4632ab0e7a8b8b194e2d705a9b9a4788ecbc9211eb711f1280ec0c95a10ec5323</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>Condensed Matter</topic><topic>Filtering</topic><topic>Iron</topic><topic>Magnesium oxide</topic><topic>Magnetoresistance</topic><topic>Magnetoresistivity</topic><topic>Materials Science</topic><topic>Monolayers</topic><topic>Physics</topic><topic>Tunnel junctions</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Duluard, A.</creatorcontrib><creatorcontrib>Bellouard, C.</creatorcontrib><creatorcontrib>Lu, Y.</creatorcontrib><creatorcontrib>Hehn, M.</creatorcontrib><creatorcontrib>Lacour, D.</creatorcontrib><creatorcontrib>Montaigne, F.</creatorcontrib><creatorcontrib>Lengaigne, G.</creatorcontrib><creatorcontrib>Andrieu, S.</creatorcontrib><creatorcontrib>Bonell, F.</creatorcontrib><creatorcontrib>Tiusan, C.</creatorcontrib><collection>CrossRef</collection><collection>Aluminium Industry Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><jtitle>Physical review. B, Condensed matter and materials physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Duluard, A.</au><au>Bellouard, C.</au><au>Lu, Y.</au><au>Hehn, M.</au><au>Lacour, D.</au><au>Montaigne, F.</au><au>Lengaigne, G.</au><au>Andrieu, S.</au><au>Bonell, F.</au><au>Tiusan, C.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Enhanced magnetoresistance by monoatomic roughness in epitaxial Fe/MgO/Fe tunnel junctions</atitle><jtitle>Physical review. B, Condensed matter and materials physics</jtitle><date>2015-05-01</date><risdate>2015</risdate><volume>91</volume><issue>17</issue><artnum>174403</artnum><issn>1098-0121</issn><eissn>1550-235X</eissn><abstract>Interfacial effects on spin and symmetry filtering in single-crystal Fe(001)/ MgO / Fe magnetic tunnel junctions are investigated with the insertion of a Fe monoatomic step at the bottom MgO interface. After annealing, the atomically flat bottom electrode is covered by a fractional part of a Fe monoatomic layer resulting in two-dimensional Fe islands that are separated for low coverages and percolated above around half a monolayer. The magnetotransport properties of the junctions are studied as a function of this Fe sublayer coverage that is varied from 0 to 1 monolayer. Surprisingly, the magnetoresistance ratio exhibits a maximum for a coverage around half a monolayer. 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| source | American Physical Society Journals |
| subjects | Condensed Matter Filtering Iron Magnesium oxide Magnetoresistance Magnetoresistivity Materials Science Monolayers Physics Tunnel junctions |
| title | Enhanced magnetoresistance by monoatomic roughness in epitaxial Fe/MgO/Fe tunnel junctions |
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