Magnetic and magneto-optical quenching in (Mn 2+ , Sr 2+ ) metaphosphate glasses
Magnetic and magneto-optical quenching in (Mn 2+ , Sr 2+ ) metaphosphate glasses
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DOI：
10.1364/ome.3.000184
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发表时间：
2013-02
影响因子：
2.8
通讯作者：
A. Winterstein;H. Akamatsu;D. Möncke;Katsuhisa Tanaka;M. Schmidt;L. Wondraczek
中科院分区：
文献类型：
--
作者：
A. Winterstein;H. Akamatsu;D. Möncke;Katsuhisa Tanaka;M. Schmidt;L. Wondraczek
过渡金属离子如Mn 2+、Fe 2+或Co 2+为光学活性玻璃中的稀土掺杂剂提供了令人感兴趣的替代物。就其磁光特性而言，它们尚未得到很好的利用。本文报道了Mn ~（2+）对偏磷酸盐玻璃基质中沿着Mn_xSr_（1-x）（PO_3）_2（x = 0. 1. Mn 2+在可见光谱范围内显示出小的光学消光，并且与其他过渡金属离子相比，具有高的有效磁矩。然而，在高Mn-水平下，由于离子簇合，Mn 2+的磁光活性强烈淬灭。重Mn 2+负载的磷酸盐基质的磁性由Mn 2 +-O-Mn 2+桥中的超交换相互作用主导，Mn 2+和O2-物种之间具有反平行自旋排列。因此，在室温下不能利用Mn 2+物种的表观顺磁势。
Transition metal ions such as Mn2+, Fe2+, or Co2+ provide an interesting alternative to rare earth dopants in optically active glasses. In terms of their magneto-optical properties, they are not yet very well exploited. Here, we report on the effect of Mn2+ on Faraday rotation in a metaphosphate glass matrix along the join MnxSr1-x(PO3)2 with x = 0...1. Mn2+ shows small optical extinction in the visible spectral range and, compared to other transition metal ions, a high effective magnetic moment. At high Mn- levels, however, the magneto-optical activity of Mn2+ is strongly quenched due to ionic clustering. The magnetic properties of the heavily Mn2+-loaded phosphate matrix are dominated by a superexchange interaction in the Mn2+-O-Mn2+ bridge with antiparallel spin alignment between Mn2+ and O2- species. The apparent paramagnetic potential of Mn2+ species can therefore not be exploited at room temperature.