Exchange coupling of Co/Cr(0 0 1) superlattices for in-plane and perpendicular anisotropy |
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| Institution: | 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People’s Republic of China;2. University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China;3. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Zhang Heng Road 239, Pudong District, Shanghai 201800, People’s Republic of China;1. Singapore Synchrotron Light Source, 5 Research Link, Singapore 117603, Singapore;2. SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China;3. Center of Superconducting and Magnetic Materials, National University of Singapore (NUS), Singapore 1175551, Singapore;4. Department of Physics, NUS, Singapore 117542, Singapore;5. NUS Graduate School for Integrative Sciences and Engineering, NUS, Singapore 117456, Singapore;6. NUSNNI-NanoCore, NUS, Singapore 117411, Singapore;1. State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, PR China;2. Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK;3. Department of Micro-Nano Fabrication Technology, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, PR China;4. Beijing Key Laboratory for Magnetoelectric Materials and Devices, Beijing 100871, PR China;5. Collaborative Innovation Center of Quantum Matter, Beijing 100871, PR China;1. Research Institute for Magnetoelectronics & Weak Magnetic-field Detection, College of Science, China Three Gorges University, Yichang 443002, PR China;2. Key Laboratory of Advanced Materials (MOE) and Beijing National Center for Electron Microscopy, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China;3. Baotou Research Institute of Rare Earths, Baotou 014030, PR China;1. Institute of Applied Physics, TU Wien, 1040 Vienna, Austria;2. CEITEC BUT, Brno University of Technology, Purkyňova 123, 612 00 Brno, Czech Republic;3. Institute of Physical Engineering, Brno University of Technology, Technická 2, 616 69 Brno, Czech Republic;1. Nanomagnetism and Microscopy Laboratory, Department of Physics, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, 502285 Telangana, India;2. Defence Metallurgical Research Laboratory, Hyderabad 500058, India |
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| Abstract: | We have investigated the exchange coupling of Co/Cr(0 0 1) superlattices by polar and longitudinal magneto-optical Kerr effect measurements, by varying both the Co and Cr film thicknesses. At a Co thickness of ≈10 Å a nearly perpendicular anisotropy is found with antiferromagnetic order in the range of 5–15 Å of Cr thickness. For these superlattices the magnetization curve starting from remanence to saturation is characterized by a surface spin-flip transition at low field, followed by domain wall nucleation and motion, and finally by a coherent spin rotation with increasing field. Antiferromagnetic coupling is also observed for superlattices with thicker Co layers and with in-plane magnetic anisotropy. |
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