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Stability of skyrmionic textures in cubic helimagnets and the role of thermal fluctuations

AuthorsLaliena, Victor; Campo, Javier
Issue Date2017
CitationIV DMI (2017)
AbstractThe Iow temperature phase diagram of the cubic helimagnet is studied as a function of temperature and magnetic field by the saddle point method including quadratic thermal fluctuations. The well-known saddle point solutions are the ferromagnetic state (FM), the conical helix state (CH) and the skyrmion lattice (SKL) obtained in the circular cell approximation. They can be stable, metastable, or unstable. At zero temperature, where the fluctuations do not contribute to the free energy, a critical field (Ho) separates the H < Ho phase, where the CH is the stable state and the FM state is unstable, from the H > Ho phase, where the opposite happens. The SKL is metastable for 0.55 < H/Ho < 0.8 and unstable elsewhere. Isolated skyrmions are unstable for H < Ho and metastable for H > Ho. The effect of the thermal fluctuations changes the scenario. First, the period of the conical helix is renormalized (Fig 1 left), increasing with the temperature and/or magnetic field. Second, for fixed temperature the CH phase looses the stability at a field value Hc(T) at which the FM state is still unstable. Thus, there exist a region in the phase diagram where both the CH and the FM state are unstable, and a intermediate phase emerges between the low-field CH phase and the high-field FM phase (Fig. 1 right). The transition from the CH to the intermediate phase is discontinuous. The nature of the intermediate phase is under investigation, but the preliminary analysis points out that the SKL beco mes the stable state at least in sorne regio o of the intermediate phase. In other regions of the intermediate phase a conical helicoid, with a propagation vector tilted with respect to the magnetic field, is the best candidate to be the stable state.
DescriptionResumen del trabajo presentado al IV International Workshop Dzyaloshinskii-Moriya Interaction and Exotic Spin Structures (DMI), celebrado en Peterhof (Rusia) del 23 al 26 de mayo de 2017.
Appears in Collections:(ICMA) Comunicaciones congresos
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