• Proceedings of the Korean Magnestics Society Conference
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• 1993.11a
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• pp.56-57
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• 1993

• Proceedings of the Korean Magnestics Society Conference
• /
• 1991.11a
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• pp.46-47
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• 1991

• Proceedings of the Korean Magnestics Society Conference
• /
• 1998.10a
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• pp.78-79
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• 1998

• Proceedings of the Korean Magnestics Society Conference
• /
• 2016.11a
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• pp.129-129
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• 2016

• Proceedings of the Korean Magnestics Society Conference
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• 2008.12a
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• pp.216.2-216.2
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• 2008

• Proceedings of the Korean Magnestics Society Conference
• /
• 2008.12a
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• pp.256.1-256.1
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• 2008

• Journal of Magnetics
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• v.3 no.2
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• pp.39-40
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• 1998

Normal state EPR signals have been studied for the n-type$ high-T_c$ superconductors $Nd_{1.85}Ce_{0.15}CuO_{4-x} and Nd_2CuO_{3.6-x}F_{0.4-y}.$ Since EPR signals were observed only in quenched non-superconducting samples and were absent in furnace-cooled samples, our results suggest that no normal state EPR signals come from pure phase n-type hihg-Tc superconductors. Our observation is consistent with previously reported absence of nomal state EPR signals in the p-type high-Tc superconductors.

• Journal of Magnetics
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• v.19 no.4
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• pp.323-326
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• 2014

Superparamagnetic maghemite nanoparticles were prepared by chemical co-precipitation, followed by a temperate oxidation stage, and investigated using FE-SEM, XRD, TGA, VSM, and M$\ddot{o}$ssbauer spectroscopy. Through SEM image and XRD analysis, its average particle size was found to be 13.9 nm. While VSM magnetic measurement showed typical superparamagnetic behavior at room temperature, M$\ddot{o}$ssbauer spectroscopic investigation revealed that non-vanishing magnetic hyperfine structure were retained. Cation distribution estimated from M$\ddot{o}$ssbauer spectroscopy confirmed the formation of maghemite nanophase in the sample.

• Journal of Magnetics
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• v.13 no.4
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• pp.140-143
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• 2008

The magnetic and structural properties of transition metal (Mn, Fe, Co) monolayers on Ta(001) surfaces are investigated theoretically by using the first principles full-potential linearized augmented plane wave method. Mn and Fe monolayers become ferromagnetic on Ta(001) surfaces while Co monolayers becomes non-magnetic. The paramagnetism of Co monolayers is explained by the Stoner theory of magnetism. The magnetic coupling of a transition metal overlayer with a substrate is ascribed to the orbital hybridization between the s and d orbitals of the transition metal.

• Journal of Magnetics
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• v.18 no.4
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• pp.380-385
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• 2013

We find a metastable vortex state of the perpendicular magnetic anisotropy free layer in spin transfer torque magnetic tunneling junctions by using micromagnetic simulations. The metastable vortex state does not exist in a single layer, and it is only found in the trilayer structure with the perpendicular magnetic anisotropy polarizer layer. It is revealed that the physical origin is the non-uniform stray field from the polarizer layer.