1. Thermomagnetic writing in Tb-Fe films
- Author
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Katsuyoshi Sunago, Shunsuke Matsushita, and Yoshifumi Sakurai
- Subjects
Materials science ,Physics and Astronomy (miscellaneous) ,Condensed matter physics ,General Engineering ,General Physics and Astronomy ,Thermomagnetic convection ,Coercivity ,Laser ,Electronic, Optical and Magnetic Materials ,Amorphous solid ,Magnetic field ,law.invention ,Magnetization ,law ,Curie temperature ,Laser power scaling ,Electrical and Electronic Engineering - Abstract
Thermomagnetic writing in amorphous Tb-Fe films prepared by thermal evaporation or rf-sputtering is described. These films have a low Curie temperature (75°C) and large values of coercive force over the wide range of temperature. Spots are thermomagnetically written and erased by using a He-Ne laser in conjunction with external magnetic field, and 1 ∼ 2 micron spots are written stably with low laser power. At this writing, a new property was found, that is, the Kerr contrast of the spots gradually varies with a value of the external magnetic field. Temperature dependences of coercive force and magnetization, spot diameter as a function of writing laser power and the Kerr contrast of spots as a function of external magnetic field are reported.
- Published
- 1976
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