Formation of new phase inclusions in the system of quasiequilibrium magnons of high density

Article

关键词: BOSE-EINSTEIN CONDENSATION;    STATE;    GAS;   

DOI  :  10.1103/PhysRevB.94.014407

来源: SCIE

【 摘 要 】

The paper studies the spatial variation of the magnetization in a nonconducting magnetic sample with an excess number of magnons in comparison to the equilibrium. The phenomenon is considered using the Landau-Lifshits equation with additional terms describing the longitudinal relaxation of the magnetization, the magnon diffusion, and the magnon creation by external pumping. The free energy of the system is presented in the mean-field approximation. It is shown that, if the pumping exceeds some critical value, regions of a new phase arise where the magnetic moments are oriented opposite to the magnetization of the magnetic sample. The phenomenon is similar to the appearance of droplets of condensed phase in a supersaturated vapor. The appearance of a new phase either in the form of a single domain or a periodical lattice is demonstrated. The studied process is a competitor to the process of the Bose-Einstein condensation of magnons.

【 授权许可】

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