Moore, Thomas A. and Moehrke, Philipp and Heyne, Lutz and Kaldun, Andreas and Klaeui, Mathias and Backes, Dirk and Rhensius, Jan and Heyderman, Laura J. and Thiele, Jan-Ulrich and Woltersdorf, Georg and Rodriguez, Arantxa Fraile and Nolting, Frithjof and Mentes, Tevfik O. and Nino, Miguel A. and Locatelli, Andrea and Potenza, Alessandro and Marchetto, Helder and Cavill, Stuart and Dhesi, Sarnjeet S. (2010) Magnetic-field-induced domain-wall motion in permalloy nanowires with modified Gilbert damping. PHYSICAL REVIEW B, 82 (9): 094445. ISSN 1098-0121,
Full text not available from this repository. (Request a copy)Abstract
Domain wall (DW) depinning and motion in the viscous regime induced by magnetic fields, are investigated in planar permalloy nanowires in which the Gilbert damping alpha is tuned in the range 0.008-0.26 by doping with Ho. Real time, spatially resolved magneto-optic Kerr effect measurements yield depinning field distributions and DW mobilities. Depinning occurs at discrete values of the field which are correlated with different metastable DW states and changed by the doping. For alpha < 0.033, the DW mobilities are smaller than expected while for alpha >= 0.033, there is agreement between the measured DW mobilities and those predicted by the standard one-dimensional model of field-induced DW motion. Micromagnetic simulations indicate that this is because as alpha increases, the DW spin structure becomes increasingly rigid. Only when the damping is large can the DW be approximated as a pointlike quasiparticle that exhibits the simple translational motion predicted in the viscous regime. When the damping is small, the DW spin structure undergoes periodic distortions that lead to a velocity reduction. We therefore show that Ho doping of permalloy nanowires enables engineering of the DW depinning and mobility, as well as the extent of the viscous regime.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | DYNAMICS; PROPAGATION; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Back > Group Christian Back |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 13 Jul 2020 06:42 |
| Last Modified: | 13 Jul 2020 06:42 |
| URI: | https://pred.uni-regensburg.de/id/eprint/24163 |
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