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arXiv 1105.2589cond-mat.str-elcond-mat.mtrl-sci
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Fe $_{0.25}$ TaS $_{2}$的反常磁光克尔磁滞回线

Anomalous magneto-optical Kerr hysteresis loops in Fe$_{0.25}$TaS$_{2}$

C. Sun, J. Kono, A. Imambekov, E. Morosan

摘要:

我们已经进行了磁光克尔光谱测量嵌入过渡金属二硫族化物Fe $_{0.25}$ TaS $_{2}$在极性克尔几何作为温度,磁场和波长的函数。克尔角在$\sim$ 775 nm(1.6 eV)和$\sim$ 515 nm(2.4 eV)处表现出明显的峰,我们将其归因于费米能附近的状态产生的自旋相关带间光学跃迁。在铁磁转变温度(165 K)以下,我们观察到强烈的波长和磁场依赖的克尔信号。在固定的波长下,克尔角的磁场依赖性表现出明显的磁滞回线,但其形状敏感地随波长变化。我们提出了一个模型,考虑到畴壁的贡献,这使我们能够推导出一个数学表达式,成功地适合所有观察到的磁滞回线。

英文摘要:

We have performed magneto-optical Kerr spectroscopy measurements on intercalated transition-metal dichalcogenide Fe$_{0.25}$TaS$_{2}$ in the polar Kerr geometry as a function of temperature, magnetic field, and wavelength. The Kerr angle exhibits pronounced peaks at $\sim$775 nm (1.6 eV) and $\sim$515 nm (2.4 eV), which we attribute to spin-dependent interband optical transitions arising from states in the vicinity of the Fermi energy. Below the ferromagnetic transition temperature (165 K), we observe strongly wavelength- and magnetic-field-dependent Kerr signal. At a fixed wavelength, the magnetic-field dependence of the Kerr angle shows a clear hysteresis loop, but its shape sensitively changes with the wavelength. We propose a model that takes into account contributions from domain walls, which allowed us to derive a mathematical expression that successfully fits all the observed hysteresis loops.

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