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Sidan uppdaterades: 2012-09-11 15:12
| Författare |
S. Tacchi T N Anh Nguyen G. Gubbiotti M. Madami G. Carlotti M. G. Pini A. Rettori V. Fallahi Randy K. Dumas Johan Åkerman |
|---|---|
| Publicerad i | Journal of Physics D-Applied Physics |
| Volym | 47 |
| Nummer/häfte | 49 |
| ISSN | 0022-3727 |
| Publiceringsår | 2014 |
| Publicerad vid |
Institutionen för fysik (GU) |
| Språk | en |
| Länkar |
dx.doi.org/10.1088/0022-3727/47/49/... |
| Ämnesord | spin waves, brillouin light scattering, exchange springs, magnetic properties of interfaces, BRILLOUIN LIGHT-SCATTERING, TORQUE OSCILLATOR, PHASE-LOCKING, MAGNETIZATION, MULTILAYERS, SYSTEMS, DRIVEN, FILMS, FIELD, DEVICES, Physics, Applied |
| Ämneskategorier | Fysik |
Exchange spring magnets, consisting of a [Co(0.5 nm)/Pd(1 nm)](5) multilayer with perpendicular magnetic anisotropy and a Co20Fe60B20 film with easy plane anisotropy, of variable thickness t(CFB), are investigated using Brillouin light scattering. On reducing t(CFB) in the range 0.8-2.3 nm, the spin-wave frequency gap displays a remarkable increase from nearly 4-48 GHz, reflecting the corresponding rapid growth of the tilting angle of the magnetization with respect to the film normal. These findings are interpreted using a one-dimensional model in which each atomic layer is assumed to be uniformly magnetized, subjected to an effective out-of-plane or easy-plane anisotropy depending on the layer position in the stack, and exchange coupled to its two nearest neighbour atomic layers. With respect to previously investigated [Co/Pd]-NiFe hybrid magnets, a largest frequency tunability, restricted to a narrower range of the soft layer thickness, is observed.
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