• Journal of the Korean Magnetics Society
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• v.5 no.2
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• pp.109-111
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• 1995

We suggest the phenominological model to determine the mangetoelastic coupling coefficient in Cu/Ni/Cu thin films by considering effective anisotropy energy with magnetic film thicknesses. This indirect determination can be applied other single crystalline systems.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.16 no.12S
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• pp.1305-1309
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• 2003

To utilize FeCoSiB amorphous films for magnetoelastic sensors, the temperature dependency of magnetization (M-T curve) and the magnetization properties of the amorphous films were investigated in this study. As the amount of cobalt In the films increased, the Curie temperature decreased but the crystallization temperature increased. In addition to this, the crystallization temperature was lower than the Curie temperature in the film containing 20 at% cobalt. The optimized annealing condition was set up by analyzing the H-T curve. And then, the amorphous film that has excellent magnetic properties and uni-axal anisotropy could be prepared for construction of the magnetoelastic sensor devices. The coercive force of the film was below 0.5 Oe and the anisotripic field was about 5 Oe.

• Journal of Magnetics
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• v.13 no.4
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• pp.160-162
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• 2008

In this work the magnetic anisotropies of magnetostriction material $Tb(Fe_{0.55}Co_{0.45})_{1.5}$ (named a-TerfecoHan) films were investigated with respect to working pressures in the range 1-7 mTorr. The results obtained show that perpendicular magnetic anisotropy (PMA) can be obtained at a working pressure above 5.1 mTorr. XRD was utilized to clarify the origin of the PMA observed in $Tb(Fe_{0.55}Co_{0.45})_{1.5}$ films, and revealed that all samples were amorphous. Therefore, we propose that the PMA effect is explained by stress produced in film due to internal relaxation process and magnetic anisotropy enhancements caused by magnetoelastic interactions.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2001.07a
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• pp.423-426
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• 2001

Recently we have reported that the meander-patterned amorphous FeCoSiB films exhibit large change in their high frequency impedance by applying a strain, suggesting that the films are very attractive for making of a highly sensitive strain sensor elements. In this study, the effect of anisotropy on a change in the impedance of sputtered amorphous film patterns was investigated in the frequency range from 1MHz to 1GHz. As a function of applied strains, the high frequency impedance was extremely changed in the case of film patterns with transverse anisotropy due to excellent magnetomechanical coupling properties. As a summary, the maximum figure of merit f has measured about 2600 in the case of transverse anisotropy, and about 500 in the case of longitudinal anisotropy at 500 MHz. These values of F are approximately more than 1000 times higher than that of a conventional metal strain gauge (F 2) and more than 10 times higher than that of a semiconductor gauge (F 200).

• Proceedings of the Korean Magnestics Society Conference
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• 1998.10a
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• pp.40-41
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• 1998

• Journal of the Korean Magnetics Society
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• v.5 no.2
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• pp.112-114
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• 1995

We show physically and mathematically that magnetoelastic coupling coefficients can be predicted to have a form of $B^{eff}=B^{b}+B^{s}/t$, sirniiarily in effective magnetic anisotropy energy in ultrathin films. The inverse thickness dependnce of magnetoelastic coupling coefficients implies lots of technical potentials.

• Proceedings of the Korean Magnestics Society Conference
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• 2000.05a
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• pp.66-67
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• 2000

• Proceedings of the Korean Magnestics Society Conference
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• 2001.04a
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• pp.116-117
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• 2001

• Proceedings of the Korean Magnestics Society Conference
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• 2002.12a
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• pp.178-179
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• 2002

CoCrPt alloy films are one of the most promising candidates for high-density perpendicular magnetic recording media due to their strong perpendicular magnetic anisotropy (PMA) and high coercivity [1]. In order to achieve high-density magnetic recording media, it is essential to characterize the magnetoelastic properties since experimental and theoretical research has revealed a significant magnetoelastic contribution to the magnetic properties in magnetic thin films. (omitted)

• Proceedings of the Korean Magnestics Society Conference
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• 2002.12a
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• pp.210-211
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• 2002

The magnetic anisotropy of amorphous wires plays a decisive role in the giant magnetoimpedance(GMI) behavior. The magnetoelastic anisotropy caused by internal stress, that are frozen in during the fabrication process, results in an axial easy axis in the core region and in a circular easy axis in the shell region [1]. It leads to a simple domain structure consisting of circular domains in the shell and axial domains in the core. For a more realistic domain structure, it has been suggested that the helical anisotropy exists due to an internal helical stress [2]. (omitted)