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首页> 外文会议>Quantum Dots and Nanostructures: Growth, Characterization, and Modeling XIII >Magneto-Optic evaluation of antiferromagnetic α-Fe_2O_3 nanoparticles coated on a quartz substrate
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Magneto-Optic evaluation of antiferromagnetic α-Fe_2O_3 nanoparticles coated on a quartz substrate

机译：石英基底涂覆在石英底物上的反铁磁α-Fe_2O_3纳米颗粒的磁光评估

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This paper presents a prima facie study of the magneto-optic response of antiferromagnetic α-Fe_2O_3 nanoparticles coated on a quartz substrate investigated by MOKE. The concentrations of the iron oxide nanoparticles in the films were varied from 8.6% to 21.5% and showed a linear increase in film thicknesses. As the concentration of the iron oxide nanoparticles were increased, the samples changed from a net-like morphology to a crystalline morphology. Magnetization reversals in the lower concentration samples were asymmetric with the reversals for the ascending and descending branch of the hysteresis loop occurring on the same side. The asymmetry in the magnetization reversal was attributed to the angle between the antiferromagnetic easy axis and the external magnetic field. With increase in concentration, an improvement in the magneto-optic response was observed with the magnetization reversal occurring via coherent rotation for both ascending and descending branches of the hysteresis loop. The changes in the magneto-optic behavior for the samples with higher concentrations is attributed to the strong exchange interactions and changes in the shape of the nanoparticles. Sensitivity studies performed on the samples showed an increased magneto-optic sensitivity to changes in magnetic field for samples of higher concentration. The high sensitivity of these samples could be exploited in magneto-optic sensors. Nanoparticles on a quartz substrate could find applications in bio-medicine due to their bio-compatibility.
机译：本文介绍了掺杂上掺杂在石英基底上的反铁磁α-Fe_2O_3纳米颗粒的磁光响应的PRIMA相对研究。薄膜中的氧化铁纳米颗粒的浓度从8.6％变化至21.5％，并显示出膜厚度的线性增加。随着氧化铁纳米颗粒的浓度增加，样品从网状形态变为结晶形态。较低浓度样品中的磁化反转与滞后回路的上升和下降分支发生在同一侧的上升和下降的逆转。磁化反转中的不对称性归因于反铁磁容易轴和外部磁场之间的角度。随着浓度的增加，通过通过相干旋转发生的磁化反转来观察到磁光响应的改善，所述滞后环的上升和下降分支。具有较高浓度的样品的磁光行为的变化归因于强的交换相互作用和纳米颗粒形状的变化。对样品进行的敏感性研究表明，对于较高浓度样本的磁场变化，磁光敏感性增加了增加。这些样品的高灵敏度可以在磁光传感器中利用。在石英底物上的纳米颗粒可能由于其生物兼容性而发现生物医学的应用。

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