By Sergej O. Demokritov
This e-book provides fresh clinical achievements within the research of magnetization dynamics in restrained magnetic structures. brought via Bloch as aircraft waves of magnetization in unconfined ferromagnets, spin waves presently play an enormous position for description of very small systems.Spin wave confinement impact used to be experimentally came upon within the Nineties in permalloy microstripes. the range of structures the place this impression is saw has been progressively growing to be due to the fact that then, such a lot of to be able to be addressed during this e-book.
The ebook comprises six chapters which originate from diverse teams of experimentalists and theoreticians dominating the sector because the discovery of the impression. diversified chapters of the booklet replicate diverse features of spin wave confinement, supplying a finished description of the impact and its position in glossy magnetism. it will likely be of price for scientists and engineers engaged on magnetic garage parts and magnetic good judgment, and can be appropriate as a complicated textbook for graduate scholars.
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Additional resources for Spin Wave Confinement
A smaller group velocity results in a larger number of magnon states in a unit frequency range. Therefore BLS intensity should increase with approaching the incidence angle corresponding to edges of Brillouin zones k x = (π ± 2π n ) T .
1 GHz (shown by circles in Fig. 32 The modes with lower frequencies (squares) are the Damon-Eshbach modes quantized due to the confinement caused by the finite width of the stripe. Values of these frequencies calculated using (19) are shown by horizontal lines for comparison. The dashed line in Fig. 38 The theory described in Section 4 predicts not only the frequencies of the quantized modes (19) or (25), but their profiles as well. A comparison between the experimentally measured BLS intensities and the results of the calculation based on (2) is presented in Fig.
A mode which is not localized at a low field can become localized with increasing field. 7. Spin-Wave Modes in Rectangular Platelets If a magnetic element confined in all dimensions is considered, there is no orientation of the external field which provides a homogeneous static internal magnetic field. However, as shown above, the magnetic dynamics in a rectangular platelet can be treated with a good accuracy as a combination of the two stripe geometries considered above, provided the thickness of the platelet is much smaller than its lateral dimensions.
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