Magnetic and magneto-optical properties of rapid thermal annealing glass/Al/BiGaDyIG double-layer films
✍ Scribed by Huai-Wu Zhang; H.J. Kim; S.Q. Yang
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 397 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0921-5107
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✦ Synopsis
The rapid thermal annealing method is used to crystallize a glass/A1/BiGaDylG double-layer film (where BiGaDylG denotes dysprosium iron garnet films doped with Bi and Ga); the effective Faraday angle of the double-layer film is about 0.25 ° greater than that for glass/BiGaDyIG film and about 0.15 ° greater than that for common glass/BiGaDyIG/A1 double films in a wide thickness range; meanwhile the Curie point is decreased because of the aluminium atoms diffusing into the garnet film and substituting at octahedral and tetrahedral Fe 3+ sites. The Curie temperature can be adjusted between 161 and 140 °C by means of delay annealing duration. The grain diameter and Faraday angle as functions of heating rate c~ and number of rapid recurrent annealings N have been presented, and are used to explain the mechanism of effective Faraday angle increase and grain size decrease, suggesting that glass/A1/BiGaDyIG films are promising candidates for blue light magneto-optical recording disks.