Si-Ge solid solution whiskers are used as sensors of various physical parameters (temperature, pressure, strain) operating in wide range of temperatures including cryogenic ones. In present paper magnetic properties of Si-Ge<B> whiskers were studied in magnetic fields (0,3-4,0) kQe in temperature range 4,2-300K. In particular magnetization and magnetic susceptibility of the whiskers were investigated. The results obtained in temperature range 77-300K show two peculiarities: 1) substantial paramagnetic contribution in whisker magnetization and magnetic susceptibility, respectively; 2) non-linear dependency of magnetization on magnetic field. These facts indicate in existing in the whiskers ferromagnetic ordering. Really observing of magnetization hysteresis at 4,2 K and substantial growth of magnetization (in several orders of magnitude) at T< 7 K confirm the above supposition. Possible reasons of the effect observed are discussed.

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