Angle-resolved soft X-ray magnetic circular dichroism in a monatomic Fe layer facing an MgO(0 0 1) tunnel barrier |
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| Institution: | 1. Photon Factory, Institute of Materials Structure Science (IMSS), High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan;2. Department of Complexity Science and Engineering, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan;3. Graduate School of Engineering Science, Osaka University, 1-3 Toyonaka, Osaka 560-8531, Japan;4. NanoElectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan;1. School of Physics, University of Melbourne, Victoria 3010, Australia;1. Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil;2. DEFIS – Universidade Federal de Ouro Preto, Ouro Preto, MG, Brazil;3. Departamento de Física, Instituto de Geociências e Ciências Exatas, Universidade Estadual Paulista, Rio Claro, SP, Brazil;4. Institut de Chimie et des Materiaux Paris Est, CNRS and Université Paris Est Créteil, 94320 Thiais, France;5. Departamento de Física, Universidade Federal de São Carlos, São Carlos, SP, Brazil;1. Institute of Physical and Organic Chemistry, Southern Federal University, 344090 Rostov-on-Don, Russian Federation;2. Southern Scientific Center of the Russian Academy of Sciences, 344006 Rostov-on-Don, Russian Federation;1. Department of Physics, National Institute of Technology, Kurukshetra 136119, India;2. National Physical Laboratory, Dr. K.S. Krishnan Marg, New Delhi 110012, India;1. REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua Campo Alegre s/n, 4169-007 Porto, Portugal;2. Dpto. de Química Inorgánica y Química Técnica, Facultad de Ciencias, UNED, Senda del Rey 9, 28040 Madrid, Spain;3. Instituto de Catálisis y Petroleoquímica, CSIC, C/Marie Curie 2, Cantoblanco, 28049 Madrid, Spain |
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| Abstract: | The electronic and magnetic states of a monatomic Fe(0 0 1) layer directly facing an MgO(0 0 1) tunnel barrier were studied by angle-resolved X-ray magnetic circular dichroism (XMCD) at the Fe L2,3 edges in the longitudinal (L) and transverse (T) arrangements. A strong XMCD reveals no oxidation of the 1-ML Fe, showing its crucial role in giant tunnel magnetoresistance effects in Fe/MgO/Fe magnetic tunnel junctions. Sum-rule analyses of the angle-resolved XMCD give values of a spin moment, in-plane and out-of-plane orbital and magnetic dipole moments. Argument is given on their physical implication. |
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