Mixed samarium valences effect in Faraday rotation glasses: Structure, optical, magnetic and magneto-optical properties
Mixed samarium valences effect in Faraday rotation glasses: Structure, optical, magnetic and magneto-optical properties
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DOI：
10.1016/j.jnoncrysol.2019.119803
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发表时间：
2020-02-15
影响因子：
3.5
通讯作者：
Ma, Qiuhua
中科院分区：
文献类型：
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作者：
Chen, Qiuling;Ma, Qiuhua
Sm~(2+)离子由于其光谱烧孔特性，在高密度存储领域具有广泛的应用前景。本研究首次研究了Sm离子的混合价态对抗磁玻璃磁性能和磁光性能的影响。用X射线光电子能谱(XPS)、X射线衍射、紫外-可见光谱(UV-Vis)、傅立叶变换红外光谱(FT-IR)、拉曼光谱和振动样品磁化强度(VSM)表征了Sm的化学价态及其对玻璃结构、光学吸收、发光、磁性和法拉第旋光性能的影响。在发光光谱中发现了Sm2+的D-5(0)->；F-7(0)和D-5(0)->；F-7(1)跃迁和(5)G(5/2)->；H-6(7/2)，(5)G(5/2)->；H-6(9/2)跃迁的特征发射峰，表明Sm3+还原为Sm2+。对Sm3d芯能级的XPS分析表明，Sm2+和Sm3+共存，且Sm2+和Sm3+的演化依赖于Sm2O3的含量。在UV-Vis光谱中观察到Sm3+离子的H-6(5/2)-&Gt；(4)G(5/2)，F-6(11/2)，F-6(9/2)，F-6(7/2)，F-6(5/2)跃迁的光学吸收，而Sm2+的吸收峰被Pb2+和Bi3+在紫外区的较强吸收所覆盖。高极化Sm离子的掺入改变了玻璃的折射率、光学截止波长和带隙。由于Sm~(2+)和Sm~(3+)离子的磁序不同，掺杂1%Sm_2O_3的玻璃表现出抗磁性，而掺入较高Sm_2O_3的玻璃表现出顺磁行为，法拉第旋光性能也受磁化强度的影响较大。1%Sm_2O_3掺杂玻璃具有最强的磁化强度和最大的费尔德常数，在633 nm处为0.1886 m in/g·cm。讨论了非桥氧结构、波长、折射率、磁化率和温度等因素对Verdet常数的影响。
Sm2+ ions are attractive in high density memory applications due to its spectral hole burning property. In this study, for the first time, the influence of mixed valence states of Sm ions to magnetic and magneto optical property of diamagnetic glasses were studied. The chemical valence states of Sm and their modification on glass structure, optical absorption, luminescence, magnetic and Faraday rotation performances were characterized using X-ray Photoelectron Spectroscopy (XPS), X-Ray diffraction, Ultraviolet-visible (UV-Vis), Fourier Transform Infrared (FT-IR), Raman spectra and vibrating-sample magnetization (VSM) measurements, respectively. Characteristic emission peaks due to D-5(0)-> F-7(0) and D-5(0)-> F-7(1) transitions of Sm2+ and (5)G(5/2)-> H-6(7/2), (5)G(5/2)-> H-6(9/2) transitions of Sm3+ ions were detected in luminescence spectra, indicating the reduction of Sm3+ to Sm2+. XPS analysis on Sm3d core-level spectra demonstrated the co-existence of Sm2+ and Sm3+ and their evolution was Sm2O3 content-dependent. Optical absorption of H-6(5/2)->(4)G(5/2), F-6(11/2), F-6(9/2), F-6(7/2), F-6(5/2) transitions of Sm3+ ions were observed in UV-VIS spectra, however, the absorption peaks of Sm2+ were covered by the stronger absorption of Pb2+ and Bi3+ ions in the UV region. The refractive index, optical cutoff wavelength and band gap of glasses were changed by the incorporation of highly polarizable Sm ions. Due to the different magnetic ordering of Sm2+ and Sm3+ ions, glass doped with 1%Sm2O3 presented diamagnetic nature while glasses doped with higher Sm2O3 exhibited paramagnetic behavior, and the Faraday rotation property also was greatly influenced by magnetization susceptibility. 1%Sm2O3 doped glasses presented the strongest magnetization and biggest Verdet constant of 0.1886 min/G.cm at 633 nm. Several influence factors to Verdet constant such as non-bridging oxygen structure, wavelength, refractive index, magnetic susceptibility and temperature were discussed.