• Transactions of the Korean Society of Automotive Engineers
• /
• v.16 no.5
• /
• pp.113-118
• /
• 2008

We have developed an integrated giant magneto resistance using not only circuit but also integrating technique with semiconductor for automobile application. It has four elements used for giant magneto resistance sensor. Ni-Fe/Cu multi layers were prepared on a glass substrate by magnetron sputtering. The dependence of magneto resistance on the thickness of the Ni-Fe and Cu layers was investigated. The MR ratio showed a saturated a peak at Cu layer $10{\AA}$, Ni-Fe layer $50{\AA}$, where the MR ratio is about 8.7% at room temperature. By means of Ni-Fe multi film and specific integrating technique, these new giant magneto resistance sensor showed excellent resistance characteristics.

• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 1999.10a
• /
• pp.113-118
• /
• 1999

The design program of fitting and thrust block including various shapes and sizes was developed for the GMR project (Great Man-made River Project in Lybia). It can automatically recalculated the minimum size of fitting required for the structural performance and can also determine the proper size of fitting for the safe and economic design by users. It was found that the results of this program was accurate and efficient when it was compared to other references. This program is also developed with GUI (Graphic User Interface) technology for the convenience of users.

• Proceedings of the Korean Magnestics Society Conference
• /
• 2002.12a
• /
• pp.154-155
• /
• 2002

스핀밸브형 GMR(Giant magnetoresistance) 소자는 낮은 자장범위에서 큰 자기저항변화가 생기는 높은 민감도의 소자로서, 고밀도 자기기록매체의 재생헤드 및 MRAM(Magnetoresistance Random Access Memory) 등의 실제 응용에 있어 큰 자기저항비와 열적 안정성을 가지는 재료들을 필요로 한다. NiO, a-$Fe_2O_3$, NiO/a-$Fe_2O_3$ 등과 같은 산화물의 경우, 높은 Tn(Neel temperature)을 가지므로 이를 이용한 Bottom형 스핀밸브에 대한 연구가 활발히 진행되어 왔다. (중략)

• Proceedings of the Korean Magnestics Society Conference
• /
• 2002.12a
• /
• pp.160-161
• /
• 2002

One problem in giant magnetoresistance(GMR) spin valves and magnetic tunneling junctions(MTJ) exchange biased by Mn-based antiferromagnets is the Mn diffusion into the ferromagnetic layer and other layers upon annealing.$^{1-3}$ It seems that Mn diffusion that may occur during annealing has a key role in the exchange biasing. We have fabricated multilayers inserting the nanolayer(NL) between antiferromagnet and ferromagent using ion-beam deposition system to study the diffusion effect for the exchange bias. (omitted)

• Proceedings of the Korean Magnestics Society Conference
• /
• 2002.12a
• /
• pp.62-63
• /
• 2002

To reach 100 Gbit/in$^2$ magnetic recording densities in hard disk drives specular enhancement of giant magnetoresistance (GMR) effect in spin valve (SV) films has become one of the indispensable means for application as read elements in recording heads [1]. More recently specular spin valve (SSV) structure containing nano-oxides layers (NOL) were reported [2], where MR enhancement is caused to extended mean free path of majority spin polarized electrons through specular reflection at metal/insulator interfaces [3] in the SV films. (omitted)

• Proceedings of the Korean Magnestics Society Conference
• /
• 2000.09a
• /
• pp.329-330
• /
• 2000

• Journal of the Korean Magnetics Society
• /
• v.5 no.5
• /
• pp.456-460
• /
• 1995

Giant magnetoresistance(GMR) of $Cu_{85-x}Co_{15}Ni_{x}$ melt-spu ribbons is closely correlated with the microstructure produced by the spinodal decomposition. The solid solution range is extanded by the replacement of Cu by Ni in the as-quenched state. The wavelengths obtained by subsequent isothermal aging in Cu-Co-Ni ribbons are shorter than those in Cu-Co binary ribbons, resulting in the increase of the surface-to-volume ratio. The largest MR ratio of 8 % in high field has been achieved in the $Cu_{80}Co_{15}Ni_{5}$ aged ribbon. The field dependence of MR ratio in low fields becomes larger with the Ni content.

• Journal of the Korean Magnetics Society
• /
• v.5 no.5
• /
• pp.663-666
• /
• 1995

The domain wall motion coercivity, $H_{c}$, of magnetic materials arises from the dependence of the wall energy on localized changes in material parameters (magnetization, anisotropy, exchange energy densities). However, in an otherwise perfectly homogeneous material, the domain wall energy might change due to the change in the volume of the wall versus the wall position. Thus, any surface roughness contributes to the coercivity. Assuming different two-dimensional surface profiles, characterized by average wavelengths ${\lambda}_{x}$ and ${\lambda}_{y}$, and relative thickness variations dh/h, the coercivity due to the surface roughness has been calculated. Compared to the one dimensional case, the 2D coercivity is reduced. Depending on the ratio of ${\lambda}$ to the domain wall width, $H_{c}$ has a maximum around 2, and increasing with dh/h. With the decreasing thickness of the thin film and GMR heads, it might be the domain factor in determining the coercivity.

• Current Optics and Photonics
• /
• v.2 no.6
• /
• pp.525-531
• /
• 2018

The effect of eccentricity on dispersion and nonlinear properties of a photonic crystal fiber having elliptical air holes is investigated using a fully vectorial effective index method. It is found that the effective refractive index increases with increase of eccentricity. The dependence of dispersion and nonlinear properties of the PCF on the eccentricity of the air hole is investigated. It is revealed that eccentricity of the air hole affects the zero dispersion wavelength. Further, the nonlinear properties such as mode field area, nonlinear coefficient and self phase modulation of the Photonic crystal fibers are analyzed. The mode field area increases and the nonlinear coefficient decreases with increase in eccentricity. The variation of the self phase modulation with elliptical air hole is also discussed.

• Current Optics and Photonics
• /
• v.3 no.4
• /
• pp.304-310
• /
• 2019

In this paper, a microstructured, hexagonal-shaped dual-core photonic crystal fiber (PCF) is proposed. The proposed structure has specific optical properties to obtain high birefringence and short coupling length, for different values of structural parameters varied over a wide range of wavelength. The properties are analyzed using a solid core of silica material. The proposed structure is implemented as a polarization splitter with splitting length of 1.9 mm and a splitting ratio of -34.988 dB, at a wavelength of 1550 nm. The obtained bandwidth in one band gap of about 81 nm. The numerical analysis ensures that the performance of the proposed polarization splitter is better than that of existing ones.