Ultrafast Control of Interfacial Exchange Coupling in Ferromagnetic Bilayer
Abstract Fast spin manipulation in magnetic heterostructures, where magnetic interactions between different materials often define the functionality of devices, is a key issue in the development of ultrafast spintronics. Although recently developed optical approaches such as ultrafast spin‐transfer...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley-VCH
2023-04-01
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| Series: | Advanced Electronic Materials |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/aelm.202201025 |
| _version_ | 1827893357533200384 |
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| author | Xiao Liu Haochen Yuan Peiwen Liu Jingyu Shi Hailong Wang Shuaihua Nie Feng Jin Zhe Zheng Xuezhe Yu Jianhua Zhao Haibin Zhao Gunter Lüpke |
| author_facet | Xiao Liu Haochen Yuan Peiwen Liu Jingyu Shi Hailong Wang Shuaihua Nie Feng Jin Zhe Zheng Xuezhe Yu Jianhua Zhao Haibin Zhao Gunter Lüpke |
| author_sort | Xiao Liu |
| collection | DOAJ |
| description | Abstract Fast spin manipulation in magnetic heterostructures, where magnetic interactions between different materials often define the functionality of devices, is a key issue in the development of ultrafast spintronics. Although recently developed optical approaches such as ultrafast spin‐transfer and spin–orbit torques open new pathways to fast spin manipulation, these processes do not fully utilize the unique possibilities offered by interfacial magnetic coupling effects in ferromagnetic multilayer systems. Here, ultrafast optically controlled interfacial exchange interactions in the ferromagnetic Co2FeAl/(Ga,Mn)As system at low laser fluence levels are experimentally demonstrated. The excitation efficiency of Co2FeAl with the (Ga,Mn)As layer is 30–40 times higher than the case with the GaAs layer at 5 K due to the modification of exchange coupling interaction via photoexcited charge transfer between the two ferromagnetic layers. In addition, the coherent spin precessions persist to room temperature, excluding the drive of pump‐modulated magnetization in the (Ga,Mn)As layer and indicating a proximity‐effect‐related optical excitation mechanism. The results highlight the importance of interfacial exchange interactions in ferromagnetic heterostructures and how these magnetic coupling effects can be utilized for ultrafast, low‐power spin manipulation. |
| first_indexed | 2024-03-12T21:53:02Z |
| format | Article |
| id | doaj.art-4d2e920f94404660bcde9e73b2ba07a9 |
| institution | Directory Open Access Journal |
| issn | 2199-160X |
| language | English |
| last_indexed | 2024-03-12T21:53:02Z |
| publishDate | 2023-04-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | Advanced Electronic Materials |
| spelling | doaj.art-4d2e920f94404660bcde9e73b2ba07a92023-07-26T01:35:24ZengWiley-VCHAdvanced Electronic Materials2199-160X2023-04-0194n/an/a10.1002/aelm.202201025Ultrafast Control of Interfacial Exchange Coupling in Ferromagnetic BilayerXiao Liu0Haochen Yuan1Peiwen Liu2Jingyu Shi3Hailong Wang4Shuaihua Nie5Feng Jin6Zhe Zheng7Xuezhe Yu8Jianhua Zhao9Haibin Zhao10Gunter Lüpke11Department of Applied Science College of William and Mary 251 Jamestown Road Williamsburg VA 23187 USAKey Laboratory of Micro and Nano Photonic Structures (Ministry of Education) Shanghai Ultra‐Precision Optical Manufacturing Engineering Research Center Department of Optical Science and Engineering Fudan University Shanghai 200433 ChinaDepartment of Applied Science College of William and Mary 251 Jamestown Road Williamsburg VA 23187 USAKey Laboratory of Micro and Nano Photonic Structures (Ministry of Education) Shanghai Ultra‐Precision Optical Manufacturing Engineering Research Center Department of Optical Science and Engineering Fudan University Shanghai 200433 ChinaState Key Laboratory of Supperlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 ChinaState Key Laboratory of Supperlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 ChinaKey Laboratory of Micro and Nano Photonic Structures (Ministry of Education) Shanghai Ultra‐Precision Optical Manufacturing Engineering Research Center Department of Optical Science and Engineering Fudan University Shanghai 200433 ChinaKey Laboratory of Micro and Nano Photonic Structures (Ministry of Education) Shanghai Ultra‐Precision Optical Manufacturing Engineering Research Center Department of Optical Science and Engineering Fudan University Shanghai 200433 ChinaState Key Laboratory of Supperlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 ChinaState Key Laboratory of Supperlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 ChinaKey Laboratory of Micro and Nano Photonic Structures (Ministry of Education) Shanghai Ultra‐Precision Optical Manufacturing Engineering Research Center Department of Optical Science and Engineering Fudan University Shanghai 200433 ChinaDepartment of Applied Science College of William and Mary 251 Jamestown Road Williamsburg VA 23187 USAAbstract Fast spin manipulation in magnetic heterostructures, where magnetic interactions between different materials often define the functionality of devices, is a key issue in the development of ultrafast spintronics. Although recently developed optical approaches such as ultrafast spin‐transfer and spin–orbit torques open new pathways to fast spin manipulation, these processes do not fully utilize the unique possibilities offered by interfacial magnetic coupling effects in ferromagnetic multilayer systems. Here, ultrafast optically controlled interfacial exchange interactions in the ferromagnetic Co2FeAl/(Ga,Mn)As system at low laser fluence levels are experimentally demonstrated. The excitation efficiency of Co2FeAl with the (Ga,Mn)As layer is 30–40 times higher than the case with the GaAs layer at 5 K due to the modification of exchange coupling interaction via photoexcited charge transfer between the two ferromagnetic layers. In addition, the coherent spin precessions persist to room temperature, excluding the drive of pump‐modulated magnetization in the (Ga,Mn)As layer and indicating a proximity‐effect‐related optical excitation mechanism. The results highlight the importance of interfacial exchange interactions in ferromagnetic heterostructures and how these magnetic coupling effects can be utilized for ultrafast, low‐power spin manipulation.https://doi.org/10.1002/aelm.202201025exchange‐coupling effectferromagnetic materialsmagneto‐opticsspin dynamicsspintronics |
| spellingShingle | Xiao Liu Haochen Yuan Peiwen Liu Jingyu Shi Hailong Wang Shuaihua Nie Feng Jin Zhe Zheng Xuezhe Yu Jianhua Zhao Haibin Zhao Gunter Lüpke Ultrafast Control of Interfacial Exchange Coupling in Ferromagnetic Bilayer Advanced Electronic Materials exchange‐coupling effect ferromagnetic materials magneto‐optics spin dynamics spintronics |
| title | Ultrafast Control of Interfacial Exchange Coupling in Ferromagnetic Bilayer |
| title_full | Ultrafast Control of Interfacial Exchange Coupling in Ferromagnetic Bilayer |
| title_fullStr | Ultrafast Control of Interfacial Exchange Coupling in Ferromagnetic Bilayer |
| title_full_unstemmed | Ultrafast Control of Interfacial Exchange Coupling in Ferromagnetic Bilayer |
| title_short | Ultrafast Control of Interfacial Exchange Coupling in Ferromagnetic Bilayer |
| title_sort | ultrafast control of interfacial exchange coupling in ferromagnetic bilayer |
| topic | exchange‐coupling effect ferromagnetic materials magneto‐optics spin dynamics spintronics |
| url | https://doi.org/10.1002/aelm.202201025 |
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