Strong magneto‐optical enhancement in highly Ce‐substituted iron garnet films prepared by sputtering
Strong magneto‐optical enhancement in highly Ce‐substituted iron garnet films prepared by sputtering
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DOI：
10.1063/1.349786
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发表时间：
1991-12
影响因子：
3.2
通讯作者：
M. Gomi;H. Furuyama;M. Abe
中科院分区：
文献类型：
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作者：
M. Gomi;H. Furuyama;M. Abe
用射频溅射法外延生长的R3-xCexFe_5O_（12）（R = Y，Gd，Yb）薄膜，在光子能量h_v = 0.9 - 4.0 eV范围内测量了其法拉第旋转谱和椭圆率谱。Ce的掺杂不仅在h ν = 1.4 eV的红外区，而且在h ν = 3.1 eV的紫外区都显著增强了法拉第效应。这两种跃迁都具有顺磁色散关系，它们的大小几乎相等，但符号相反。在h ν = 2.1 eV时，Ce 3+引起的一个新的跃迁也引起了光吸收，该跃迁不增强法拉第旋转。这些电子跃迁可以归因于电荷转移跃迁Ce3+（4f）-Fe3+（tet.）。
Faraday rotation and ellipticity spectra were measured at photon energies hν=0.9–4.0 eV for R3−xCexFe5O12 (R=Y, Gd, Yb) films with substitutions up to x=2.5, expitaxially grown by rf sputtering. The Ce substitution prominently enhances the Faraday effect not only in the IR region at hν=1.4 eV but also in the UV region at hν=3.1 eV. Both transitions have a paramagnetic dispersion relation, which are nearly equal in magnitude but opposite in sign. Optical absorption is also induced by a new transition due to Ce3+ at hν=2.1 eV, which does not enhance Faraday rotation. These electronic transitions may be attributed to charge transfer transition Ce3+(4f)‐Fe3+(tet.).