The magnetic field dependences of the frequencies of standing spin-wave
modes in a tangentially magnetized array of thin rectangular permalloy dots
(800 × 550 nm) were measured experimentally by a Brillouin light scattering technique and calculated
theoretically using an approximate size-dependent quantization of the spin-wavevector
components in the dipole-exchange dispersion equation for spin waves propagating in a
continuous magnetic film. It was found that the inhomogeneous internal bias magnetic field
of the dot has a strong influence on the profiles of the lowest spin-wave standing modes. In
addition, the dynamic magnetization distributions found for both longitudinally and
transversely magnetized long magnetic stripes gives a good approximation for mode
distributions in a rectangular dot magnetized along one of its in-plane sides. An
approximate analytic theory of exchange-dominated spin-wave modes, strongly localized
along the dot edge that is perpendicular to the bias magnetic field, is developed. A
good quantitative agreement with the results of the BLS experiment is found.
There is a paucity of studies with this approach; however, the results showed the importance of researches in this area, which turns the subject into an important field of research.
Nebivolol was effective in reducing cardiac ischaemic events in patients with HF of ischaemic aetiology. The prevention of ischaemic events can be an additional beneficial effect of β-blockade in HF patients with underlying CAD.
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