Excitation of spin waves by an electric current |
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| Affiliation: | 1. Dpto. Física Aplicada, University of Salamanca, 37008 Salamanca, Spain;2. Dpto. Electricidad y Electrónica, University of Valladolid, 47011 Valladolid, Spain;1. Computational Nanoelectronics and Nano-device Laboratory, National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore;2. School of Physical and Mathematical Sciences, 21 Nanyang Link, Nanyang Technological University, Singapore 637371, Singapore;1. Graduate School of Materials Science, National Yunlin University of Science and Technology, Douliu, Yunlin 640, Taiwan, ROC;2. Taiwan SPIN Research Center, National Yunlin University of Science and Technology, Douliu, Yunlin 640, Taiwan, ROC;3. Department of Physics, National Changhua University of Education, Changhua 500, Taiwan, ROC;1. Departemen Fisika, FMIPA Universitas Indonesia, Depok, 16424, Indonesia;2. Research Center for Physics, Indonesian Institute of Sciences (LIPI), Bld 440, Puspiptek Office Area, Tangerang Selatan, Indonesia;3. Department of Physics, Chungbuk National University, Cheongju, 28644, South Korea |
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| Abstract: | The excitation of spin waves in an unbounded ferromagnetic film by a direct spin-polarized current distributed over a small area is treated macroscopically. The derived critical threshold current for excitation has two additive terms: The first arises from radiation of spin waves and is constant. The second arises from local viscous dissipation and varies in proportion to damping coefficient, external field, and area. An application of these predictions modifies the existing interpretation of experiments by Tsoi and collaborators employing currents flowing through point contacts. |
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