• Journal of the Korean Recycled Construction Resources Institute
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• v.10 no.4
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• pp.600-608
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• 2022

This study investigates the effect of layered double hydroxide (LDH) on the healing performance of self-healing concrete by assessing the chloride penetration resistance of self-healing cement mortars using electrical chloride ion migration-diffusion test. Test results show that both mortars containing healing materials only and mortars containing healing materials and Ca-Al LDH together mostly had higher migration-diffusion coefficients right after cracking, but the migration-diffusion coefficients decreased more than that of OPC with increasing healing ages, and thus, they yielded higher healing capacities than OPC. Also, mortars containing Ca-Al LDH together with healing materials showed higher reduction of their migration-diffusion coefficients, and thus, higher healing capacities than mortars containing healing materials only. This suggests that as the self-healing product increases on the crack surface, the binding of chloride ions by LDH inside the crack increases.

• Journal of the Korean Magnetics Society
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• v.15 no.1
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• pp.21-24
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• 2005

This work is to present each properties and the interfacial characterization between PZT layer and LSMO layer of PZT/LSMO/Pt. LSMO thin film grown by KrF(248 nm) excimer lasers are used in pulsed in pulsed laser deposition(PLD). PZT coposites thin films were deposited by spin coating using a commercial resist spinner. LSMO thin film by deposition oxygen pressure 125 mtorr have rhombohedral structure on Pt(111) substrate. The PZT/LSM/Pt pre-orientate to [111] direction. The final thin films were shown that magnetic and electric property was typical value, respective. We report that the lattice between the PZT/LSMO thin film and the substrate plays a very important role and may control to another effects.

• Journal of the Korean Magnetics Society
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• v.21 no.2
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• pp.52-55
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• 2011

Spin-transfer torque is a useful tool to control the magnetic state in nanostructures. In magnetic tunnel junctions, the spin-transfer torque has two components, the in-plane spin torque and the perpendicular spin torque. While properties of the in-plane spin-transfer torque are relatively well understood, properties of the perpendicular spin-transfer torque still remain controversial. A recent experiment demonstrated that in asymmetric magnetic tunnel junctions, the bias voltage dependence of the perpendicular spin-transfer torque contains both linear and quadratic terms in the bias. However it still remains unexplored how the bias voltage dependence changes as a function of material parameters. In this paper, we systematically investigate the perpendicular spin-transfer torque in asymmetric magnetic tunnel junction by varying spin splitting energy, work function difference, and Fermi energy of the ferromagnetic metal leads.

• The Journal of the Korea institute of electronic communication sciences
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• v.12 no.6
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• pp.1057-1064
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• 2017

High sensitivity magnetic sensor having foreign metal detection capability is proposed utilizing giant magneto-impedance effect. Strip sensor showed the increasing output voltage when the external magnetic field was applied along with strip from strip grounding point, although the initial DC voltage varied depending on the pointing direction of strip sensor. Proposed sensor was able to eliminate more than half of background noise using active noise filter to achive high sensitivity, and it showed the capability to detect magnetized foreign metal object independent of ambient electro-magnetic noise and earth magnet. In case of ferrous sphere, the metal detection up to 0.8mm diameter was experimentally demonstrated at 5mm distance from strip sensor.

• Proceedings of the KSMRM Conference
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• 2007.10a
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• pp.28-29
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• 2007

• Proceedings of the KSMRM Conference
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• 2007.10a
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• pp.57-58
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• 2007

• Journal of KSNVE
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• v.21 no.2
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• pp.29-34
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• 2011

이번 기초강좌 코너에서는 앞으로 4회 혹은 5회에 걸쳐서 소위 영어로 'magnetostriction' 한국말로는 '자기변형 혹은 자왜현상'(이하 자기변형 현상으로 통일하여 지칭함)이라고 불리는 현상에 대한 연재를 진행할 예정이다. 지능형 물질에 대한 관심이 어느 때보다 높아진 요즘에 독자들의 요구에 부합하는 시의적절한 연재물이 되기를 기대하며 때때로 필자의 근거 없는 사견이 포함되더라도 독자 여러분들의 많은 양해를 부탁드린다.

• Proceedings of the Korean Magnestics Society Conference
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• 1999.04a
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• pp.138-139
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• 1999

• Proceedings of the Korean Magnestics Society Conference
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• 2011.06a
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• pp.153-154
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• 2011

• Proceedings of the Korean Magnestics Society Conference
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• 2003.06a
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• pp.186-187
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• 2003