Effects of oxide replacement with fluoride at the CoFeB interface on interface magnetic anisotropy and its voltage control
In this paper we report results of improving Co60Fe20B20 interface perpendicular magnetic anisotropy (PMA) by replacing neighbor oxide layer with fluoride one. We expected that fluorine as element with higher than oxide electronegativity could more effectively attract electrons from out-of-plane d o...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2018-05-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/1.5006420 |
| _version_ | 1819238824857829376 |
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| author | Mykhailo Pankieiev Koji Kita |
| author_facet | Mykhailo Pankieiev Koji Kita |
| author_sort | Mykhailo Pankieiev |
| collection | DOAJ |
| description | In this paper we report results of improving Co60Fe20B20 interface perpendicular magnetic anisotropy (PMA) by replacing neighbor oxide layer with fluoride one. We expected that fluorine as element with higher than oxide electronegativity could more effectively attract electrons from out-of-plane d orbitals of ferromagnetic, increasing role of in-plane orbitals. By this we wanted to increase PMA and its response to applied voltage bias. Polar magneto-optic Kerr effect measurement show decreasing of out-of-plane magnetic field needed to change magnetization to perpendicular in stacks with oxygen replaced by fluorine as well as increasing of coefficient of response to applied voltage α from < 10 fJ/Vm for CoFeB/Al2O3 interface to 20 fJ/Vm for CoFeB/AlF3/Al2O3 and 22 fJ/Vm for CoFeB/MgF2 stacks. Direct chemical interaction of Co with F was confirmed by x-ray photoelectron spectroscopy (XPS) measurement of Co2p core level region. Moreover angular-resolved XPS showed that F tends to stay at CoFeB interface rather than diffuse out of it. |
| first_indexed | 2024-12-23T13:42:22Z |
| format | Article |
| id | doaj.art-2be5f22779154ed796e460260833c549 |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-12-23T13:42:22Z |
| publishDate | 2018-05-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-2be5f22779154ed796e460260833c5492022-12-21T17:44:49ZengAIP Publishing LLCAIP Advances2158-32262018-05-0185055901055901-510.1063/1.5006420063891ADVEffects of oxide replacement with fluoride at the CoFeB interface on interface magnetic anisotropy and its voltage controlMykhailo Pankieiev0Koji Kita1Department of Materials Engineering, The University of Tokyo, Tokyo 113-8656, JapanDepartment of Materials Engineering, The University of Tokyo, Tokyo 113-8656, JapanIn this paper we report results of improving Co60Fe20B20 interface perpendicular magnetic anisotropy (PMA) by replacing neighbor oxide layer with fluoride one. We expected that fluorine as element with higher than oxide electronegativity could more effectively attract electrons from out-of-plane d orbitals of ferromagnetic, increasing role of in-plane orbitals. By this we wanted to increase PMA and its response to applied voltage bias. Polar magneto-optic Kerr effect measurement show decreasing of out-of-plane magnetic field needed to change magnetization to perpendicular in stacks with oxygen replaced by fluorine as well as increasing of coefficient of response to applied voltage α from < 10 fJ/Vm for CoFeB/Al2O3 interface to 20 fJ/Vm for CoFeB/AlF3/Al2O3 and 22 fJ/Vm for CoFeB/MgF2 stacks. Direct chemical interaction of Co with F was confirmed by x-ray photoelectron spectroscopy (XPS) measurement of Co2p core level region. Moreover angular-resolved XPS showed that F tends to stay at CoFeB interface rather than diffuse out of it.http://dx.doi.org/10.1063/1.5006420 |
| spellingShingle | Mykhailo Pankieiev Koji Kita Effects of oxide replacement with fluoride at the CoFeB interface on interface magnetic anisotropy and its voltage control AIP Advances |
| title | Effects of oxide replacement with fluoride at the CoFeB interface on interface magnetic anisotropy and its voltage control |
| title_full | Effects of oxide replacement with fluoride at the CoFeB interface on interface magnetic anisotropy and its voltage control |
| title_fullStr | Effects of oxide replacement with fluoride at the CoFeB interface on interface magnetic anisotropy and its voltage control |
| title_full_unstemmed | Effects of oxide replacement with fluoride at the CoFeB interface on interface magnetic anisotropy and its voltage control |
| title_short | Effects of oxide replacement with fluoride at the CoFeB interface on interface magnetic anisotropy and its voltage control |
| title_sort | effects of oxide replacement with fluoride at the cofeb interface on interface magnetic anisotropy and its voltage control |
| url | http://dx.doi.org/10.1063/1.5006420 |
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