Nonlinear magnetoelastic effects in ultrathin epitaxial FCC Co(0 0 1) films:: an ab initio study |
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| Institution: | 1. Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia;2. Max-Planck-Institut für Metallforschung, Institut for Physik, Heisenbergstraße 1, Postfach 800665, D-70569 Stuttgart, Germany;1. Mechanics of Materials Department, Sandia National Laboratories, Livermore, CA 94550, USA;2. Radiation and Nuclear Detection Materials and Analysis Department, Sandia National Laboratories, Livermore, CA 94550, USA;3. MEMS Technologies Department, Sandia National Laboratories, Albuquerque, NM 87185, USA;4. Department of Electrical Engineering, University of Texas at El Paso, El Paso, TX 79968, USA;5. Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, NM 87185, USA;6. Computational Materials and Data Science Department, Sandia National Laboratories, Albuquerque, NM 87185, USA;1. School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai 200240, People''s Republic of China;2. School of Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, People''s Republic of China;3. School of Computing, Engineering and Mathematics, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia;4. Centre for Infrastructure Engineering, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia;5. Department of Mechanical Engineering, University of New Orleans, New Orleans, LA 70148, USA;1. Moscow Technological University (MIREA), Moscow, Russia;2. Immanuel Kant Baltic Federal University, Kaliningrad, Russia;3. University of Portsmouth, Faculty of Science, SEES, Portsmouth, UK;1. Piezoelectric Device Laboratory, School of Mechanical Engineering and Mechanics, Ningbo University, Ningbo, 315211 Zhejiang, China;2. Noise and Vibration Laboratory, Institute of Acoustics, Chinese Academy of Sciences, 100190 Beijing, China |
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| Abstract: | Those linear and nonlinear magnetoelastic coupling coefficients which determine the magnetostrictive stress and the strain-induced out-of-plane magnetic anisotropy in epitaxially grown FCC Co(0 0 1) films are calculated by the ab initio density functional electron theory. The nonlinear couplings have a strong effect on the change Δσ1m of the in-plane magnetostrictive stress resulting from a change of the magnetization direction from 0 1 0] to 1 0 0], but a negligibly small effect on the out-of-plane anisotropy eMCA. The calculations confirm the experimental result that the measured out-of-plane anisotropy cannot be totally attributed to volume magnetoelastic effects. Estimates are given for the nonlinear magnetoelastic coupling coefficients m1γ,2 and m2γ,2. |
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