Faraday effect of bismuth iron garnet thin film prepared by mist CVD method

Abstract

Metastable bismuth iron garnet (BIG, an abbreviation of Bi 3 Fe 5 O 12), one kind of garnet-type ferrites, is known to manifest very large Faraday rotation as well as low optical absorption in the visible to infrared region. We report on successful synthesis of thin film composed of single-phase BIG epitaxially grown on single-crystalline gadolinium gallium garnet (Gd 3 Ga 5 O 12 , GGG) substrate by using mist chemical vapor deposition (CVD) method, which is an emerging technique for preparation of thin films. The crystal structure, surface morphology, and magnetic, optical and magneto-optical properties of the resultant thin films have been explored. The BIG thin film has a relatively flat surface free from roughness compared to those prepared by other vapor deposition methods. Saturation magnetization is about 1620 G at room temperature, which is close to that expected from the ideal magnetic structure of BIG. The maximum value of Faraday rotation angle reaches 54.3 deg/µm at a wavelength of 424 nm. This value is rather large when compared with those reported for BIG thin films prepared by other techniques. The wavelength dependence of Faraday rotation angle is analyzed well in terms of the crystal electric field (CEF) level schema. Our result suggests that the mist CVD method is a simple and effective technique to synthesize BIG thin film with excellent magneto-optical properties.

Optical and magneto-optical properties of Bi substituted yttrium iron garnets prepared by metal organic decomposition

“…In comparison to previous results on the bulk-like films reported by Wittekoek, in here, we can notice smaller ε 1i amplitude and an absorption edge shift from 2.5 to 2.2 eV. However, similar measurement performed on thin single crystal Bi:YIGs films reported absorption data similar to our results [42][43][44]. Therefore we atributed this disprepancy to the fact that we have been studying thin single crystaline Bi:YIGs films.…”

Surface-plasmon opto-magnetic field enhancement for all-optical magnetization switching

“…The magnetic susceptibility is calculated using Eq. ( 2) with experimentally reported values of [25] and M0 [26] for BIG. In Fig.…”

Switchable plasmonic routers controlled by external magnetic fields by using magneto-plasmonic waveguides

“…( 9) and (16). We note that the experimentally observed gyration values of 0.03 or 0.06 for Bi-substituted iron garnet (BIG) have been reported in Ref., 35 in the Table 1 of Ref. 36 and in the Methods of Ref.…”