Miniaturization of magnetic storage devices causes an increasing interest in patterned magnetic films and magnetic dot arrays. Recent experiments performed using Brillouin light scattering (BLS) technique on magnetic wires [1-3] and circular dots [4] have shown that the spin wave (SW) spectrum in such patterned films is quantized. The calculations of dipole-exchange SW spectra of non-ellipsoidal magnetic dots are necessary for better understanding of experimentally observed dynamic properties of arrays of the dots and wires, in particular, a process of fast remagnetization of such magnetic elements. The main difficulty in description of non-ellipsoidal samples is the non-uniform character of the internal demagnetization field in the dot. Below we calculate discrete dipole-exchange SW spectra of rectangular permalloy (FeNi) dots using by the tensorial Green's functions method [5], and compare our calculation with the results of our latest experiments done by means of BLS technique, described in detail in [3].
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