FMR investigation of magnetic anisotropies in Fe/Au superlattices |
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| Affiliation: | 1. Hubei Province Key Laboratory of Systems Science in Metallurgical Process, The State Key Laboratory for Refractories and Metallurgy, Collaborative Innovation Center for Advanced Steels, International Research Institute for Steel Technology, Wuhan University of Science and Technology, Wuhan, 430081, China;2. Key Laboratory of Metallurgical Equipment and Control Technology, Key Laboratory of Mechanical Transmission and Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan, 430081, China;1. Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo, Himeji, Japan;2. IoT Device Laboratory, NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki, Japan;3. Department of Energy and Environment, National Institute of Advanced Industrial Science and Technology, Ikeda, Japan;4. Department of Chemistry and Materials Engineering, Faculty of Chemistry, Materials and Bioengineering, Kansai University, Suita, Japan;5. Nippon Graphite Industries, Otsu, Japan;6. Nano Materials Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan;1. Istituto Italiano di Tecnologia, Center for Sustainable Future Technologies, Via Livorno 60, 10144 Torino, Italy;2. Politecnico di Torino, Department of Electronics, Corso Duca degli Abruzzi 24, 10129 Torino, Italy;3. Istituto Italiano di Tecnologia, Electronic Design Laboratory, Via Enrico Melen 83, 16152 Genova, Italy;4. Politecnico di Torino, Department of Mechanical and Aerospace Engineering, Corso Duca degli Abruzzi 24, 10129 Torino, Italy;1. Faculty of Physics, Shahid Beheshti University, Evin, 19839, Tehran, Iran;2. Department of Physics, Faculty of Science, University of Kurdistan, 66177-15175, Sanandaj, Iran;3. Research Center for Nanotechnology, University of Kurdistan, 66177-15175, Sanandaj, Iran;4. Laser and Plasma Research Institute, Shahid Beheshti University, Tehran, 19839, Iran;1. Physics Department, Herbert H. Lehman College and Graduate School, The City University of New York, 250 Bedford Park Boulevard West, Bronx, NY 10468-1589, USA;2. Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia |
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| Abstract: | Fe(xML)/Au(xML) superlattices (1⩽x⩽4, ML: monatomic layer thickness) have been investigated by the ferromagnetic resonance method at room temperature. It has been confirmed that out-of-plane anisotropy field Hu shows oscillatory behavior as a function of Fe layer thickness with a period of 1 ML as reported previously from magnetization measurements. In addition, we have found that the in-plane fourfold anisotropy field H2 oscillates in a similar manner. The easy magnetization axis for x⩾2.25 is Fe [1 1 0] in contrast with the case of bulk Fe, and the values of H2 show maxima for x=2.5 and 3.5, suggesting that the atomic steps at interfaces are formed along the Fe [1 1 0] direction. Furthermore, the interface roughness for x=non-integer causes wide distributions of Hu and H2 compared to those for x=integer with flat interfaces. |
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