Thermal stability of sputtered GdDyFeCo films with trilayer structure

The thermal stability of GdDyFeCo films with trilayer structure has been studied by annealing in vacuum up to 300/spl deg/C. In GdDyFeCo films sputtered on glass, the coercivity is reduced after annealing, which is thought to be due to a structural relegation caused by annealing. The saturation magn...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1994-11, Vol.30 (6), p.4428-4430
Main Authors: Uchihara, Y., Tanase, K., Suzuki, Y., Torazawa, K.
Format: Article
Language:English
Subjects:
Annealing
Coercive force
Glass
Magnetic films
Magnetic moments
Magnetic properties
Saturation magnetization
Temperature
Testing
Thermal stability
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Summary:The thermal stability of GdDyFeCo films with trilayer structure has been studied by annealing in vacuum up to 300/spl deg/C. In GdDyFeCo films sputtered on glass, the coercivity is reduced after annealing, which is thought to be due to a structural relegation caused by annealing. The saturation magnetization tends to increase upon annealing, in particular for rare-earth rich composition because of the increase of effective magnetic moment, making the compensation temperature (Tcomp) shift higher. The films with Tcomp between room temperature and 100/spl deg/C show superior thermal stability, because their magnetic properties, especially Tcomp, change little after annealing. Overwrite repetition tests using magnetic field modulation recording also indicate that the disks with the Tcomp between room temperature and 100/spl deg/C have superior overwrite durability. Small adjustments of the GdDy content seem to be effective in improving the thermal stability of GdDyFeCo films. The best Tcomp of the GdDyFeCo films is between room temperature and 100/spl deg/C, and the optimum Dy:Gd ratio is between 45/55 and 70/30.< >
ISSN:0018-9464
1941-0069
DOI:10.1109/20.334109