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Damping and modal structure of patterned magnetic nanoarrays |
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| Authors: | K Rivkin IP Nevirkovets JB Ketterson BK Sarma |
| Institution: | a Department of Physics, Texas A&M University, College Station, TX 77843, USA b Department of Physics and Astronomy, Northwestern University, Evanston, IL 60208, USA c Department of Electrical and Computer Engineering, Northwestern University, Evanston, IL 60208, USA d Materials Research Center, Northwestern University, Evanston, IL 60208, USA e Department of Physics, University of Wisconsin, Milwaukee, WI 53201, USA f Department of Electrical and Computer Engineering, University of Illinois at Chicago, Chicago, IL 60607, USA |
| Abstract: | A number of studies have shown that ferromagnetic resonance linewidths in magnetic thin films contain a significant contribution due to processes, such as inhomogeneous broadening and two-magnon scattering followed by decay to the phonon thermal bath. We present a classical theoretical approach that permits the calculation of such processes for arrays of arbitrarily shaped magnetic nanoparticles and, by comparison with experimental results, demonstrates that the linewidth broadening and damping are dominated by inhomogenities that strongly depend on the equilibrium state of magnetization and can be used to identify the latter. |
| Keywords: | Ferromagnetic resonance Two-magnon scattering Spin waves Inhomogeneous broadening |
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