• Journal of the Korean Society of Manufacturing Technology Engineers
• /
• v.23 no.4
• /
• pp.368-373
• /
• 2014

This paper presents the dynamic modeling and analysis results for a spindle supported by angular contact ball bearings (ACBBs) subjected to angular misalignment. Although ACBBs are widely used in spindle systems, their characteristics in regard to angular misalignment have rarely been investigated. A simulation program was developed to calculate the dynamic characteristics of a simple spindle model that is supported by angular contact ball bearings subjected to angular misalignment. Angular misalignment is shown to introduce anisotropy into the angular contact ball bearings and then split the natural frequencies in spindles. Simulations were also performed to show the possibility of evaluating bearing misalignment using natural frequency measurements.

• Journal of the Korean Magnetics Society
• /
• v.7 no.4
• /
• pp.186-190
• /
• 1997

We measured an anisotropy inhomogeniety and dispersion of rf sputterd permalloy thin films by TBP(Transverse Biased Permeability) measurement method. Angular distribution function had a shape similar to the Lorentzian distribution, but magnitude distribution function deviates from the sysmetric Lorentzian distribution because of long tail to the region of a high Hk value. With increasing film thickness, the angular and magnitude anisotropy dispersion increased. The increase of angular dispersion was due to both the increase of grain size and local anisotropy in thicker films.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2003.07a
• /
• pp.432-435
• /
• 2003

최근 초고압 케이블 절연체로 XLPE(가교 폴리에틸렌)이 널리 사용되어 지면서 XLPE의 여러 물리 화학적 특성에 따른 절연 성능에 관한 연구가 활발히 이루어지고 있다. 이러한 XLPE 절연층은 제조과정에서 압출과정을 거쳐 도체를 감싸게 되는데 이 과정에서 흐름 패턴으로 나타나는 비등방성(anisotropy)을 띠게된다. 본 논문에서는 초고압 XLPE 케이블에서 시계 방향으로 나타나는 비등방성(anisotropy)이 나타내는 기계-전기적 특성을 인장강도(tensile strength), 트리 개시전압 및 개시시간을 측정한 결과를 토대로 고찰해 보았으며, 이러한 비등방성이 초고압 XLPE 케이블의 절연 성능에 영향을 주는 인자로 고려되어야 함을 알 수 있었다.

• Journal of the Korean Magnetics Society
• /
• v.13 no.6
• /
• pp.243-245
• /
• 2003

The anomalous angular modulation of magnetoresistance in Co/Cu multilayers is explained assuming substrate-induced magnetic anisotropy. The magnetic parameters of Co/Cu multilayers is determined using angular modulation of magnetoresistance and theoretical model including substrate-induced anisotropy. This mechanism introduces a new possible way of modulating the giant magnetoresistance.

• Journal of the Korean Magnetics Society
• /
• v.23 no.2
• /
• pp.37-42
• /
• 2013

The out-of-plane and in-plane angular dependence of ferromagnetic resonance field was measured in NiFe thin films fabricated by magnetron sputtering. The effective magnetization was obtained from the out-of-plane angular dependence of ferromagnetic resonance field, which was well agreed with calculated one. The decrease of effective magnetization with NiFe thickness was due to the surface anisotropy constant of $K_s=-0.23\;erg/cm^2$. The in-plane uniaxial anisotropy fields were obtained from the in-plane angular dependence of ferromagnetic resonance field. The easy axis of in-plane uniaxial anisotropy field was rotated to the reverse direction of applied magnetic field during sample fabrication, which was explained by the antiferromagnetic NiFeO layer at sample surface.

• Journal of the Korean Magnetics Society
• /
• v.26 no.2
• /
• pp.50-54
• /
• 2016

We analyzed the angular dependence of ferromagnetic resonance linewidth in exchange coupled CoFe/MnIr bilayers. The maximum and minimum linewidth was observed in the easy and hard direction of unidirectional anisotropy by exchange coupling, respectively, and it was well agreed with the angular dependence of exchange bias field. The maximum linewidth was due to the twist of CoFe magnetization near CoFe/MnIr interface from direction of pinned MnIr spin to direction of applied magnetic field. While, minimum linewidth more higher than that of CoFe was related to rotatable anisotropy field, and explained by easy axis distribution of MnIr grains.

• Journal of the Korean Society for Nondestructive Testing
• /
• v.10 no.2
• /
• pp.38-42
• /
• 1990

The specific strength of the fiber reinforced composite material is closely related to the anisotropy of the material. For the quantitative characterization of the anisotropy in the composite material, applied was CODF concept which was extensively used in the metallic material. As the results, the anisotropy of the material could be quantitatively analysed from the measurement of the phase velocities of the angular dependent $SH_o$ waves.

• Bulletin of the Korean Chemical Society
• /
• v.23 no.6
• /
• pp.865-872
• /
• 2002

A systematic way of determining the equilibrium orientation of carbon monoxide (CO) in heme proteins using time-resolved polarized mid-IR spectroscopy is presented. The polarization anisotropy at pump-probe delay time of zero in the limit of zero photolysis and the angular distrbution function of CO are required to obtain the equilibrium orientation of CO. An approach is developed for determining the polarization anisotropy in the zero-photolysis limit from the anisotropy measured under finite photolysis conditions in an optically thick sample where the fraction of molecules photolyzed decreased as the pump pulse passes through and is absorbed by the sample. This approach is verified by measuring the polarization anisotropy of CO of carbonmonoxy myoglobin at various levels of photolysis. This method can be readily applied to other photoselection experiments determining precise angle between transition dipoles.

• Journal of Magnetics
• /
• v.10 no.4
• /
• pp.133-136
• /
• 2005

The NiMn/NiFe bilayer structure which was short time annealed in order to induce unidirectional anisotropy were studied as a function of annealing temperature. The maximum exchange bias field of NiMn/NiFe bilayer was presented at $250^{\circ}C$ after short time annealing process with no external field. The appearance of exchange bias was due to phase transformation of NiMn layer. In plane angular dependence of a resonance field distribution which measured by FMR was analysed as a combined effect of unidirectional anisotropy and uniaxial anisotropy. The resonance field and the line width from FMR measurement were also analysed with annealing temperature.

• Journal of Magnetics
• /
• v.5 no.4
• /
• pp.135-138
• /
• 2000

In order to study the effect of the magnetic anisotropy on the giant magnetoresistance in a Co/Cu multilayered system, the angle dependent magnetoresistance (MR) was measured. The experimental results showed that the maximum MR ratio depends on the angle between the direction of the applied field and the easy axis. The angular modulation of the MR ratio can be explained by the alignments of the two 'effective' magnetization vectors that are bound to their own easy axes. Two maxima observed in MR loops at the second antiferromagnetic maximum are discussed in relation to the magnetic anisotropy, The simulated results under the assumption of the existence of two in-plane easy axes in the sample are compared with the experiments.