Spacer Thickness and Temperature Dependences of the Interlayer Exchange Coupling in a Co/Pt/Co Three-Layer Structure
Domain wall mobility as a function of nonmagnetic interlayer thickness and temperature was studied in ultrathin exchange-coupled ferromagnetic layers using magneto-optic Kerr microscopy. The system under study is a Pt/Co/Pt/Co/Pt heterostructure having perpendicular magnetic anisotropy and a middle...
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MDPI AG
2023-07-01
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| Series: | Magnetochemistry |
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| Online Access: | https://www.mdpi.com/2312-7481/9/7/176 |
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| author | V. S. Gornakov I. V. Shashkov O. A. Tikhomirov Yu. P. Kabanov |
| author_facet | V. S. Gornakov I. V. Shashkov O. A. Tikhomirov Yu. P. Kabanov |
| author_sort | V. S. Gornakov |
| collection | DOAJ |
| description | Domain wall mobility as a function of nonmagnetic interlayer thickness and temperature was studied in ultrathin exchange-coupled ferromagnetic layers using magneto-optic Kerr microscopy. The system under study is a Pt/Co/Pt/Co/Pt heterostructure having perpendicular magnetic anisotropy and a middle Pt layer with spatially variable thickness. The ferromagnetic interaction between the Co layers is observed when the Pt interlayer thickness varies from 5 to 6 nm in a temperature range of 200–300 K. There is a certain interval of Pt layer thickness where domain walls in both ferromagnetic layers move independently. Nonlinear dependence of the domain wall displacement on the applied field was measured. It is shown that an equilibrium position of the relaxed domain wall depends on field, temperature, and the nonmagnetic interlayer thickness. This position is determined by the energy balance: (i) domain wall displacement provided by the applied field, (ii) interlayer exchange interaction in the area swept by the domain wall, and (iii) domain wall coercivity. The mechanism of domain wall stabilization in terms of independent wall motion near critical thickness was considered. It is found that both the coercivity of the Co layer and the critical thickness decrease at higher temperature, while the interlayer exchange constant J is changed weakly. |
| first_indexed | 2024-03-11T00:54:13Z |
| format | Article |
| id | doaj.art-d1933c9f2d9d43928eb691083a488c65 |
| institution | Directory Open Access Journal |
| issn | 2312-7481 |
| language | English |
| last_indexed | 2024-03-11T00:54:13Z |
| publishDate | 2023-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Magnetochemistry |
| spelling | doaj.art-d1933c9f2d9d43928eb691083a488c652023-11-18T20:13:35ZengMDPI AGMagnetochemistry2312-74812023-07-019717610.3390/magnetochemistry9070176Spacer Thickness and Temperature Dependences of the Interlayer Exchange Coupling in a Co/Pt/Co Three-Layer StructureV. S. Gornakov0I. V. Shashkov1O. A. Tikhomirov2Yu. P. Kabanov3Osipyan Institute of Solid State Physics RAS, Moscow District, 2 Academician Osipyan Str., Chernogolovka 142432, RussiaOsipyan Institute of Solid State Physics RAS, Moscow District, 2 Academician Osipyan Str., Chernogolovka 142432, RussiaOsipyan Institute of Solid State Physics RAS, Moscow District, 2 Academician Osipyan Str., Chernogolovka 142432, RussiaOsipyan Institute of Solid State Physics RAS, Moscow District, 2 Academician Osipyan Str., Chernogolovka 142432, RussiaDomain wall mobility as a function of nonmagnetic interlayer thickness and temperature was studied in ultrathin exchange-coupled ferromagnetic layers using magneto-optic Kerr microscopy. The system under study is a Pt/Co/Pt/Co/Pt heterostructure having perpendicular magnetic anisotropy and a middle Pt layer with spatially variable thickness. The ferromagnetic interaction between the Co layers is observed when the Pt interlayer thickness varies from 5 to 6 nm in a temperature range of 200–300 K. There is a certain interval of Pt layer thickness where domain walls in both ferromagnetic layers move independently. Nonlinear dependence of the domain wall displacement on the applied field was measured. It is shown that an equilibrium position of the relaxed domain wall depends on field, temperature, and the nonmagnetic interlayer thickness. This position is determined by the energy balance: (i) domain wall displacement provided by the applied field, (ii) interlayer exchange interaction in the area swept by the domain wall, and (iii) domain wall coercivity. The mechanism of domain wall stabilization in terms of independent wall motion near critical thickness was considered. It is found that both the coercivity of the Co layer and the critical thickness decrease at higher temperature, while the interlayer exchange constant J is changed weakly.https://www.mdpi.com/2312-7481/9/7/176interlayer exchange couplingferromagnetic heterostructureperpendicular magnetic anisotropydomain wallkerr microscopytemperature |
| spellingShingle | V. S. Gornakov I. V. Shashkov O. A. Tikhomirov Yu. P. Kabanov Spacer Thickness and Temperature Dependences of the Interlayer Exchange Coupling in a Co/Pt/Co Three-Layer Structure Magnetochemistry interlayer exchange coupling ferromagnetic heterostructure perpendicular magnetic anisotropy domain wall kerr microscopy temperature |
| title | Spacer Thickness and Temperature Dependences of the Interlayer Exchange Coupling in a Co/Pt/Co Three-Layer Structure |
| title_full | Spacer Thickness and Temperature Dependences of the Interlayer Exchange Coupling in a Co/Pt/Co Three-Layer Structure |
| title_fullStr | Spacer Thickness and Temperature Dependences of the Interlayer Exchange Coupling in a Co/Pt/Co Three-Layer Structure |
| title_full_unstemmed | Spacer Thickness and Temperature Dependences of the Interlayer Exchange Coupling in a Co/Pt/Co Three-Layer Structure |
| title_short | Spacer Thickness and Temperature Dependences of the Interlayer Exchange Coupling in a Co/Pt/Co Three-Layer Structure |
| title_sort | spacer thickness and temperature dependences of the interlayer exchange coupling in a co pt co three layer structure |
| topic | interlayer exchange coupling ferromagnetic heterostructure perpendicular magnetic anisotropy domain wall kerr microscopy temperature |
| url | https://www.mdpi.com/2312-7481/9/7/176 |
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