• Proceedings of the Korean Magnestics Society Conference
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• 2010.06a
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• pp.99-100
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• 2010

• Proceedings of the Korean Nuclear Society Conference
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• 2002.10a
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• pp.306.1-306
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• 2002

• The Science & Technology
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• s.497
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• pp.48-51
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• 2010

• Proceedings of the Korean Magnestics Society Conference
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• 2005.12a
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• pp.102-104
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• 2005

• Proceedings of the Korean Magnestics Society Conference
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• 1998.10a
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• pp.8-9
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• 1998

• Proceedings of the Korean Magnestics Society Conference
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• 2000.09a
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• pp.570-571
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• 2000

• Proceedings of the Korean Magnestics Society Conference
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• 2014.11a
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• pp.129-129
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• 2014

• Journal of the Korean Magnetics Society
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• v.7 no.1
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• pp.31-37
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• 1997

The magnetoresistance and the saturation field behavior of the Co-Ag nano granular films as a function of the composition and the ferromagnetic underlayer and overlayermaterials were investigated. The maximum magnetoresistance of 23% and the saturation field of 2.3 kOe at room temperature were obtained in the as-deposited 3000$\AA$ $Co_{30}Ag_{70}$ single alloy films. The magnetoresistance and the saturation field of 100$\AA$ $Co_{30}Ag-{70}$ alloy film were 3.65 % and 3.0 kOe respectively. Those of the sandwiched films with 200$\AA$ Fe were 3.3 % and 1.23 kOe respectively. The saturation field of the sandwiched alloy films could be reduced by the exchange coupling between the ferromagnetic layers and the alloy layer. The effective depth of the exchange coupling was approximately 150$\AA$ in each Fe layer. Among the Fe, Co, and FeNi, the most effective materials to reduce the saturation field of the sandwiched alloy films was Fe.

• Journal of the Korean Magnetics Society
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• v.13 no.6
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• pp.237-242
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• 2003

$Ti_{1-x}$$^{57}$ F $e_{x}$ $O_2$(0.0$\leq$x$\leq$0.07) compounds were fabricated using the sol-gel method, and the crystal structure and magnetic properties were investigated as a function of doped $^{57}$ Fe concentration. X-ray diffraction patterns showed a pure anatase single phase, without any segregation of Fe into particulate. With varying $^{57}$ Fe concentration, we could observe unusual magnetic phenomena in these materials. Doping $^{57}$ Fe into the Ti $O_2$ nonmagnetic semiconductor formed magnetic properties, but the gradual increase of $^{57}$ Fe concentration decreased rapidly the ferromagnetic properties rather than enhanced the ferromagnetic properties. Obvious ferromagnetic behavior was shown for the samples with x$\leq$0.01, while paramagnetic behavior was shown for the sample with x$\geq$0.03. These phenomena could be verified using Mossbauer measurement. Separation of the ferromagnetic phase (sextet) and the paramagnetic phase (doublet) of the samples with different $^{57}$ Fe concentration was characterized. Samples with x$\leq$0.01 have sextet and doublet simultaneously, but samples with x$\geq$0.03 have only doublet at room temperature. This indicates that the sample x$\leq$0.01 have the ferromagnetic phase at room temperature. This result corresponded with the M-H loops referenced above and reveals an interesting feature that there is a critical limit of $^{57}$ Fe concentration (0.01$\leq$0.01 samples was fundamentally attributable to the paramagnetic phase as well as the ferromagnetic phase.e.

• Journal of the Korean Vacuum Society
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• v.4 no.3
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• pp.283-286
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• 1995

자화도와 비저항의 온도에 따른 변화를 측정함으로써 덩치 가돌리늄의 큐리온도를 정확히 결정하였다. 이 두 물리량은 큐리온도에서 비정상적인 특이성을 보여준다. 이들의 특이성에서 결정된 큐리온도의 값은 서로 1도 이내에서 잘 일치함을 보여주었다.