Scaling of nonlinear susceptibilities in an artificial permalloy honeycomb lattice

Article

关键词: SPIN ICE;    FRUSTRATION;    TRANSITION;    BEHAVIOR;    GLASSES;    SYSTEM;   

DOI  :  10.1103/PhysRevB.97.214420

来源: SCIE

【 摘 要 】

Two-dimensional artificial magnetic honeycomb lattice is predicted to manifest several magnetic phase transitions as a function of reducing temperature. We have performed the analysis of nonlinear susceptibility to explore the equilibrium nature of phase transition in artificial honeycomb lattice of ultrasmall connected permalloy (Ni0.81Fe0.19) elements, typical length of similar or equal to 12 nm. The nonlinear susceptibility chi(n1) is found to exhibit an unusual crossover character in both temperature and magnetic field. The higher order susceptibility chi(3) changes from positive to negative as the system traverses through the spin solid phase transition at T-s = 29 K. Additionally, the static critical exponents, used to test the scaling of chi(n1), do not follow the conventional scaling relation. We conclude that the magnetic phase transition, especially to the low temperature spin solid order, is not conventional in nature at this length scale.

【 授权许可】

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