Lorentz TEM study of the magnetic microstructure in near-eutectoid Co-Pt alloys
•The magnetic microstructure of a new-eutectoid Co-Pt alloy was investigated.•An unconventional inter-phase magnetic domain wall was discovered.•Domain walls in tweed and macro-twinned microstructures are reported. In this paper, we report Lorentz Transmission Electron Microscopy (LTEM) observations...
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| Veröffentlicht in: | Journal of magnetism and magnetic materials 2019-06, Vol.479, p.204-211 |
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| container_title | Journal of magnetism and magnetic materials |
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| creator | Kashyap, Isha Vetter, Eric P. Floro, Jerrold A. De Graef, Marc |
| description | •The magnetic microstructure of a new-eutectoid Co-Pt alloy was investigated.•An unconventional inter-phase magnetic domain wall was discovered.•Domain walls in tweed and macro-twinned microstructures are reported.
In this paper, we report Lorentz Transmission Electron Microscopy (LTEM) observations of magnetic domain structures in a near-eutectoid Co40Pt60 alloy. The crystallographic microstructure is characterized using conventional bright field/dark field TEM imaging. The magnetic induction orientation inside magnetic domains is extracted from Fresnel through-focus images by reconstructing the phase of electron wave using the transport-of-intensity equation. The alloy shows a nano-chessboard pattern composed of the L10 tetragonal and L12 cubic phases. The magnetization distribution in four neighboring L10 tiles in the nano-chessboard structure is found to follow a vortex/anti-vortex configuration to reduce the magnetostatic and magneto-crystalline anisotropy energies. An unconventional domain wall referred to as an inter phase magnetic domain wall (IPMDW) is observed at the inter-phase boundaries of L10 and L12 phases. Magnetic domain walls in other microstructures (tweed microstructure, macro-twinned structure, coarsened L10 plates) are also documented. |
| doi_str_mv | 10.1016/j.jmmm.2019.02.036 |
| format | Article |
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In this paper, we report Lorentz Transmission Electron Microscopy (LTEM) observations of magnetic domain structures in a near-eutectoid Co40Pt60 alloy. The crystallographic microstructure is characterized using conventional bright field/dark field TEM imaging. The magnetic induction orientation inside magnetic domains is extracted from Fresnel through-focus images by reconstructing the phase of electron wave using the transport-of-intensity equation. The alloy shows a nano-chessboard pattern composed of the L10 tetragonal and L12 cubic phases. The magnetization distribution in four neighboring L10 tiles in the nano-chessboard structure is found to follow a vortex/anti-vortex configuration to reduce the magnetostatic and magneto-crystalline anisotropy energies. An unconventional domain wall referred to as an inter phase magnetic domain wall (IPMDW) is observed at the inter-phase boundaries of L10 and L12 phases. Magnetic domain walls in other microstructures (tweed microstructure, macro-twinned structure, coarsened L10 plates) are also documented.</description><identifier>ISSN: 0304-8853</identifier><identifier>EISSN: 1873-4766</identifier><identifier>DOI: 10.1016/j.jmmm.2019.02.036</identifier><language>eng</language><publisher>Amsterdam: Elsevier B.V</publisher><subject>Alloys ; Anisotropy ; Cobalt ; Crystallography ; Domain walls ; Eutectoid transformation ; Eutectoids ; Image reconstruction ; Lorentz TEM ; Magnetic domain wall ; Magnetic domains ; Magnetic induction ; Microstructure ; Phase reconstruction ; Plates (structural members) ; Platinum ; Platinum base alloys ; Transmission electron microscopy</subject><ispartof>Journal of magnetism and magnetic materials, 2019-06, Vol.479, p.204-211</ispartof><rights>2019 Elsevier B.V.</rights><rights>Copyright Elsevier BV Jun 1, 2019</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c328t-7f1ce83009fc997feb741d72733bf8b60ae2c820fac9c78ca5bd36705ecf6e1a3</citedby><cites>FETCH-LOGICAL-c328t-7f1ce83009fc997feb741d72733bf8b60ae2c820fac9c78ca5bd36705ecf6e1a3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.jmmm.2019.02.036$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,777,781,3537,27905,27906,45976</link.rule.ids></links><search><creatorcontrib>Kashyap, Isha</creatorcontrib><creatorcontrib>Vetter, Eric P.</creatorcontrib><creatorcontrib>Floro, Jerrold A.</creatorcontrib><creatorcontrib>De Graef, Marc</creatorcontrib><title>Lorentz TEM study of the magnetic microstructure in near-eutectoid Co-Pt alloys</title><title>Journal of magnetism and magnetic materials</title><description>•The magnetic microstructure of a new-eutectoid Co-Pt alloy was investigated.•An unconventional inter-phase magnetic domain wall was discovered.•Domain walls in tweed and macro-twinned microstructures are reported.
In this paper, we report Lorentz Transmission Electron Microscopy (LTEM) observations of magnetic domain structures in a near-eutectoid Co40Pt60 alloy. The crystallographic microstructure is characterized using conventional bright field/dark field TEM imaging. The magnetic induction orientation inside magnetic domains is extracted from Fresnel through-focus images by reconstructing the phase of electron wave using the transport-of-intensity equation. The alloy shows a nano-chessboard pattern composed of the L10 tetragonal and L12 cubic phases. The magnetization distribution in four neighboring L10 tiles in the nano-chessboard structure is found to follow a vortex/anti-vortex configuration to reduce the magnetostatic and magneto-crystalline anisotropy energies. An unconventional domain wall referred to as an inter phase magnetic domain wall (IPMDW) is observed at the inter-phase boundaries of L10 and L12 phases. Magnetic domain walls in other microstructures (tweed microstructure, macro-twinned structure, coarsened L10 plates) are also documented.</description><subject>Alloys</subject><subject>Anisotropy</subject><subject>Cobalt</subject><subject>Crystallography</subject><subject>Domain walls</subject><subject>Eutectoid transformation</subject><subject>Eutectoids</subject><subject>Image reconstruction</subject><subject>Lorentz TEM</subject><subject>Magnetic domain wall</subject><subject>Magnetic domains</subject><subject>Magnetic induction</subject><subject>Microstructure</subject><subject>Phase reconstruction</subject><subject>Plates (structural members)</subject><subject>Platinum</subject><subject>Platinum base alloys</subject><subject>Transmission electron microscopy</subject><issn>0304-8853</issn><issn>1873-4766</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNp9kD1PwzAQhi0EEqXwB5gsMSec7TR2JBZU8SUVwQCz5TpncNTExXaQyq8nVZmZbnmfu3sfQi4ZlAxYfd2VXd_3JQfWlMBLEPURmTElRVHJuj4mMxBQFUotxCk5S6kDAFapekZeViHikH_o290zTXlsdzQ4mj-R9uZjwOwt7b2NIeU42jxGpH6gA5pY4JjR5uBbugzFa6Zmswm7dE5OnNkkvPibc_J-f_e2fCxWLw9Py9tVYQVXuZCOWVQCoHG2aaTDtaxYK7kUYu3UugaD3CoOztjGSmXNYt2KWsICrauRGTEnV4e92xi-RkxZd2GMw3RSc86Eks1CVVOKH1L7Bimi09voexN3moHei9Od3ovTe3EauJ7ETdDNAcLp_2-PUSfrcbDY-jg11m3w_-G_oE53fA</recordid><startdate>20190601</startdate><enddate>20190601</enddate><creator>Kashyap, Isha</creator><creator>Vetter, Eric P.</creator><creator>Floro, Jerrold A.</creator><creator>De Graef, Marc</creator><general>Elsevier B.V</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20190601</creationdate><title>Lorentz TEM study of the magnetic microstructure in near-eutectoid Co-Pt alloys</title><author>Kashyap, Isha ; Vetter, Eric P. ; Floro, Jerrold A. ; De Graef, Marc</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c328t-7f1ce83009fc997feb741d72733bf8b60ae2c820fac9c78ca5bd36705ecf6e1a3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Alloys</topic><topic>Anisotropy</topic><topic>Cobalt</topic><topic>Crystallography</topic><topic>Domain walls</topic><topic>Eutectoid transformation</topic><topic>Eutectoids</topic><topic>Image reconstruction</topic><topic>Lorentz TEM</topic><topic>Magnetic domain wall</topic><topic>Magnetic domains</topic><topic>Magnetic induction</topic><topic>Microstructure</topic><topic>Phase reconstruction</topic><topic>Plates (structural members)</topic><topic>Platinum</topic><topic>Platinum base alloys</topic><topic>Transmission electron microscopy</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Kashyap, Isha</creatorcontrib><creatorcontrib>Vetter, Eric P.</creatorcontrib><creatorcontrib>Floro, Jerrold A.</creatorcontrib><creatorcontrib>De Graef, Marc</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</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>Kashyap, Isha</au><au>Vetter, Eric P.</au><au>Floro, Jerrold A.</au><au>De Graef, Marc</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Lorentz TEM study of the magnetic microstructure in near-eutectoid Co-Pt alloys</atitle><jtitle>Journal of magnetism and magnetic materials</jtitle><date>2019-06-01</date><risdate>2019</risdate><volume>479</volume><spage>204</spage><epage>211</epage><pages>204-211</pages><issn>0304-8853</issn><eissn>1873-4766</eissn><abstract>•The magnetic microstructure of a new-eutectoid Co-Pt alloy was investigated.•An unconventional inter-phase magnetic domain wall was discovered.•Domain walls in tweed and macro-twinned microstructures are reported.
In this paper, we report Lorentz Transmission Electron Microscopy (LTEM) observations of magnetic domain structures in a near-eutectoid Co40Pt60 alloy. The crystallographic microstructure is characterized using conventional bright field/dark field TEM imaging. The magnetic induction orientation inside magnetic domains is extracted from Fresnel through-focus images by reconstructing the phase of electron wave using the transport-of-intensity equation. The alloy shows a nano-chessboard pattern composed of the L10 tetragonal and L12 cubic phases. The magnetization distribution in four neighboring L10 tiles in the nano-chessboard structure is found to follow a vortex/anti-vortex configuration to reduce the magnetostatic and magneto-crystalline anisotropy energies. An unconventional domain wall referred to as an inter phase magnetic domain wall (IPMDW) is observed at the inter-phase boundaries of L10 and L12 phases. Magnetic domain walls in other microstructures (tweed microstructure, macro-twinned structure, coarsened L10 plates) are also documented.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><doi>10.1016/j.jmmm.2019.02.036</doi><tpages>8</tpages></addata></record> |
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| subjects | Alloys Anisotropy Cobalt Crystallography Domain walls Eutectoid transformation Eutectoids Image reconstruction Lorentz TEM Magnetic domain wall Magnetic domains Magnetic induction Microstructure Phase reconstruction Plates (structural members) Platinum Platinum base alloys Transmission electron microscopy |
| title | Lorentz TEM study of the magnetic microstructure in near-eutectoid Co-Pt alloys |
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