Diffusion-limited kinetics of the antiferromagnetic to ferrimagnetic lambda-transition in Fe1-xS

作者：Herbert F William; Krishnamoorthy Aravind; Yildiz Bilge^*; Van Vliet Krystyn J

来源：Applied Physics Letters, 2015, 106(9): 092402.

DOI：10.1063/1.4913201

Fe1-xS (0.08 <= x <= 0.11) exhibits a simultaneous magneto-structural "lambda-transition" at approximately 200 degrees C. Time-dependent magnetization measurements demonstrate the lambda-transition can be accurately modeled by a stretched exponential function, consistent with a nucleation-free, continuous reordering of the vacancy-bearing sublattice. The experimental result is supported by kinetic Monte Carlo simulations that confirm the activation energy for the transition to be 1.1 +/- 0.1 eV-representing the iron vacancy migration energy in ordered Fe1-xS. A mechanistic understanding of the lambda-transition enables potential functional uses of Fe1-xS such as thermally activated magnetic memory, switches, or storage.

• 出版日期2015-3-2
• 单位MIT