51. Evidence of a strong perpendicular magnetic anisotropy in Au/Co/MgO/GaN heterostructures
- Author
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Hongxin Yang, Hervé Rinnert, Xavier Devaux, Sylvie Migot, Yuan Lu, Baishun Yang, Nicolas Bernier, Bérangère Hyot, Qian Sun, Hui Yang, Mathieu Stoffel, Chunping Jiang, Xue Gao, Ning Tang, Shiheng Liang, Adeline Grenier, Zhongming Zeng, Stéphane Mangin, Jianping Liu, Ludovic Pasquier, Sunan Ding, Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Key Laboratory of Nanodevices and Applications, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Peking University [Beijing], Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL), University of Science and Technology of China [Hefei] (USTC), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), and ANR-18-CE24-0017,FEOrgSpin,Contrôle ferroélectrique de la spinterface organique/ferromagnétique(2018)
- Subjects
010302 applied physics ,Materials science ,Condensed matter physics ,General Engineering ,Bioengineering ,Heterojunction ,02 engineering and technology ,General Chemistry ,021001 nanoscience & nanotechnology ,Epitaxy ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Magnetic field ,Magnetic anisotropy ,Atomic orbital ,0103 physical sciences ,Sapphire ,[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,General Materials Science ,[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics ,0210 nano-technology ,Anisotropy ,ComputingMilieux_MISCELLANEOUS ,Molecular beam epitaxy - Abstract
International audience; We report a strong perpendicular magnetic anisotropy (PMA) in Au/Co/MgO/GaN heterostructures from both experiments and first-principles calculations. The Au/Co/MgO heterostructures have been grown by molecular beam epitaxy (MBE) on GaN/sapphire substrates. By carefully optimizing the growth conditions, we obtained a fully epitaxial structure with a crystalline orientation relationship Au(111)[ 110]// Co(0001)[11 20]//MgO(111)[10 1]//GaN(0002)[11 20]. More interestingly, we demonstrate that a 4.6 nm thick Co film grown on MgO/GaN still exhibits a large perpendicular magnetic anisotropy. First-principles calculations performed on the Co (4ML)/MgO(111) structure showed that the MgO(111) surface can strongly enhance the magnetic anisotropy energy by 40% compared to a reference 4ML thick Co hcp film. Our layer-resolved and orbital-hybridization resolved anisotropy analyses helped to clarify that the origin of the PMA enhancement is due to the interfacial hybridization of O 2p and Co 3d orbitals at the Co/MgO interface. The perpendicularly magnetized Au/Co/MgO/GaN heterostructures are promising for efficient spin injection and detection in GaN based opto-electronics without any external magnetic field.
- Published
- 2019