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We study a classical double exchange magnet with direct antiferromagneticsuperexchange coupling, J, between the localized spins. It is shown that thede-stabilization of the ferromagnetic ground state with increasing J leads tophase separation; the latter always preempts the spin-wave instability(softening of the magnon spectrum). It is also found that the boundariesseparating the ferromagnetic and antiferromagnetic areas of the sample tend tobe abrupt.Comment: 3 pages, LaTeX-Revtex, 2 PostScript figures; misprints corrected,  including those in the published versio

Spin waves, phase separation, and interphase boundaries in double exchange magnets