Structural and magnetic properties of BCC Fe/Co (0 0 1) superlattices |
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| Institution: | 1. Department of Physics, Uppsala University, Box 530, S-751 21 Uppsala, Sweden;2. Department of Materials Science, Uppsala University, Box 534, S-751 21 Uppsala, Sweden;3. Material Science Division, Argonne National Laboratory, Building 223, Argonne, IL 60439, USA;1. Universidade Federal de Viçosa, Departamento de Física, Avenida Peter Henry Rolfs s/n, 36570-000 Viçosa, MG, Brazil;2. Facultad de Ingeniería, Universidad Autónoma de Chile, Avda. Pedro de Valdivia 425, Providencia, Santiago, Chile;3. CEDENNA, Avda. Ecuador 3493, Santiago, Chile;4. Instituto de Física, Pontifícia Universidad Católica de Chile, Campus San Joaquín Av. Vicuña Mackena 4860, Santiago, Chile;5. Departamento de Física, Universidad de Santiago de Chile and CEDENNA, Avda. Ecuador 3493, Santiago, Chile;6. Departamento de Física, CEDENNA, Millennium Nucleus on Smart Soft Mechanical Metamaterials, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Av. Blanco Encalada 2008, Santiago, Chile;1. School of Materials Science and Engineering, Changwon National University, Changwon, Gyeongnam, 51140 South Korea;2. Department of Physics, Abdul Wali Khan University Mardan, Pakistan;1. Center for Research in Nanoscience and Nanotechnology, University of Calcutta, JD-2, Salt Lake City, Kolkata 700098, West Bengal, India;2. Department of Physics, University of Calcutta, 92 A.P.C. Road, Kolkata 700009, India;3. Department of Physics, Seth Anandram Jaipuria College, 10, Raja Naba Krishna Street, Kolkata 700005, India;4. CMP Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700 064, India;1. Department of Physics, College of Science, King Faisal University, P.O Box 400, Hofuf, Al-Ahsa, 31982, Saudi Arabia;2. Department of Physics, University of Petroleum & Energy Studies, Dehradun, 248007, India;3. School of Material Science and Engineering, Changwon National University, Changwon, Gyeongnam, 51140, Republic of Korea;4. Department of Physics, Banasthali Vidyapith, Banasthali- 304022, Rajasthan, India;5. Department of Pure & Applied Physics, University of Kota, Kota, 324005, Rajasthan, India |
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| Abstract: | In thin layered Fe/Co (0 0 1), grown on MgO (0 0 1), both Fe and Co crystallize in the body-centered cubic (BCC) structure, as seen in a series of superlattices where the layer thickness of the components is varied from two to twelve atomic monolayers. These superlattices have novel magnetic properties as observed by magnetization and polarized neutron reflectivity measurements. There is a significant enhancement of the magnetic moments of both Fe and Co at the interfaces. Furthermore, the easy axis of the system changes from 1 0 0] for films of low cobalt content to 1 1 0] for a Co content exceeding 33%. No indication of a uniaxial anisotropy component is found in any of the samples. The first anisotropy constant (K1) of BCC Co is found to be negative with an estimated magnitude of 110 kJ/m3 at 10 K. In all cases, the magnetic moments of Fe and Co have parallel alignment. |
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