A study on the Kerr angle enhancement by the magnetic image effect (abstract)
- Department of Applied Physics, Chung Cheng Institute of Technology, Tahsi 335, Taiwan, Republic of (China)
- Opto-Electronics & Systems Laboratory, ITRI, Chutung, Hsinchu 310, Taiwan, Republic of (China)
Recently, new mechanisms have been proposed to explain the giant enhancements of M-O Kerr effect. In this work, we use magnetic image effect to explain the Kerr angle enhancement of M-O media on Co-base amorphous films. The M-O layer and reflection layer were produced by using conventional dc magnetron sputtering processes. The Kerr hysteresis loops of M-O films were measured with wavelength from 500 to 860 nm, and the peak applied field was 9 kOe. We have studied the enhancements of Kerr angle in TbFeCo amorphous film which sandwiched by AlN layers and backed with Co-base amorphous film. There is a remarkable increase of Kerr angle with value 1.85{degree} at wavelength 640 nm. At wavelength 780 nm, the Kerr angle of magneto-optic medium on Co-base amorphous ribbon has been significantly enhanced by a factor of 3.1 as compared to that on Al foil. Because of its high permeability and low coercivity, the Co-base amorphous film serve as a magnetic shielding material which can induce the magnetic image effect for M-O film. Theoretical calculations show that the Kerr angle can be enhanced by the image magnetic field. The calculated values of Kerr angle are in good agreement with experiment results. An explicit equation to calculate the Kerr angle will be discussed. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 280066
- Report Number(s):
- CONF-951101--
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 79; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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