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We study the possibility to apply phenomenological approach to thedescription of magnetic transitions in UGe2 with the help of Landau free energyexpanded to 8-th order in magnetisation. The analysis shows that for certainvalues of parameters in front of M^4, and M^6 terms in the free energy there idpossibility for the appearance of two successive phase transitions between thelow-magnetisation and high-magnetisation phase with the same structure. Weestablish the relation of the parameters in Landau energy, for which the phasetransition from the disordered to low-magnetisation phase is of second order asthe experimental data shows. Within our approximation the transition betweentwo magnetically ordered phases is of first order

Application of phenomenological Landau approach to the description of  magnetic phase transitions in the ferromagnetic superconductor at ambient  pressure