Observation of thermomagnetically written domains by Lorentz electron microscopy in Tb‐Co and Tb‐Fe‐Co disks
| Autor: | Takao Suzuki, Nobuaki Yasuda, Yumi Mizusawa, K. Ichihara |
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| Rok vydání: | 1988 |
| Předmět: | |
| Zdroj: | Journal of Applied Physics. 63:5154-5158 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.340418 |
| Popis: | For better understanding of the read/write properties of magneto‐optical disks, thermomagnetically written domains were observed by Lorentz electron microscopy. The domains were written in the quadrilayered medium with 25‐nm‐thick Tb‐Co film and in the trilayered medium with 50‐nm‐thick Tb‐Fe‐Co film, which were sputtered on pregrooved resinous substrates. Recording power and frequency were varied at intervals of 3.5 mm in a radial direction of the disk, and each recording position was observed individually. Qualitative understanding of the read/write properties, such as carrier‐to‐noise ratio (C/N) and jitter, were well achieved from Lorentz images of the domains. It is found that the C/N value of the Tb‐Fe‐Co film with a higher figure of merit (Rθk ) is lower than that of the Tb‐Co film with a lower value of Rθk . The reason for this is believed to be due to a larger variation in domain shape in the Tb‐Fe‐Co film compared to the Tb‐Co film. A careful observation based upon the image processing of domain... |
| Databáze: | OpenAIRE |
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