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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Magnetics
Journal Basic Information
Journal DOI :
The Korean Magnetics Society
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Volume & Issues
Volume 5, Issue 4 - Dec 2000
Volume 5, Issue 3 - Sep 2000
Volume 5, Issue 2 - Jun 2000
Volume 5, Issue 1 - Mar 2000
Selecting the target year
Phase Transitions in
P Nuclear Magnetic Relaxation
Kim, K. S. ; Lee, C. H. ; Lee, Cheol-Eui ; N. S. Dalal ; R. Fu ; S. Y. Jeong ; Kim, J. N. ; Kim, S. C. ;
Journal of Magnetics, volume 5, issue 3, 2000, Pages 73~75
Undoped and Cr-doped samples of electrooptic material KTiOPO
were studied by
P nuclear magnetic resonance (NMR). Spin-lattice relaxation time (
) measurements manifested phase transition behaviors that are attributed to changes in the dominant charge carriers in different temperature ranges.
Modified Magnetism at Buried Co/Pd Interface: Depth-Resolved Magnetic Circular Dichroism Study Using Soft X-ray Standing Waves
Kim, Sang-Koog ; Kortright, J.B. ; Shin, Sung-Chul ;
Journal of Magnetics, volume 5, issue 3, 2000, Pages 76~80
Soft x-ray standing waves produced by a multilayer interference substrate add depth-sensitivity to magnetic circular dichroism to resolve changes in Co magnetism across a 10
distance from the Co center to the Co-Pd interface of a Pd/Co/Pd trilayer having in-plane magnetization. Large enhancements of in-plane orbital and spin magnetic moments, as well as the number of d holes, are strongly localized in a thin interface layer. These results provide new insight into the phenomenon of magnetic anisotropy at buried interfaces, and suggest a broad applicability of such standing wave measurements to interface magnetism studies.
Measurements of Local Coercivity Distribution in Ferromagnetic Films Using Magneto-Optical Microscope Magnetometer (MOMM)
Choe, Sug-Bong ; Shin, Sung-Chul ;
Journal of Magnetics, volume 5, issue 3, 2000, Pages 81~84
A magneto-optical microscope magnetometer (MOMM) has been developed to simultaneously measure 2-dimensional array hysteresis loops of each local area of
spots on ferromagnetic films, in addition to grabbing time-resolved domain evolution patterns. Using the system, spatial distribution of local coercivity can be quantitatively generated and then, compared directly with domain patterns grabbed at precisely the same position of a sample. It is clearly demonstrated that local coercivity distribution governs domain reversal behavior via a thermally activated relaxation process.
Analysis of Hysteretic Giant Magnetoimpedance Using Stoner-Wohlfarth Model
Jang, K.J. ; Kim, C.G. ; Kim, D.Y. ; Kim, C.O. ;
Journal of Magnetics, volume 5, issue 3, 2000, Pages 85~89
The hysteretic characteristics of giant magnetoimpedance (GMI) profiles have been measured in Co-based amorphous ribbon with various anisotropy angles
, and they have been analyzed by using the Stoner-Wohl-farth model. Two-peaks behavior with a dip near zero field is revealed in the measured GMI profile at 10 MHz irrespective of
. The negligible hysteresis of the field fur the dip is close to the calculation assuming the magnetization jump from a metastable to stable state. However, the hysteretic asymmetry far the angle range of $20^\circ\leq\theta_k < 60^\circ$ is well described by the divergence in the calculation without the magnetization jump. The asymmetry for
may be due to the divergence, but the shapes of measured profiles are quite different from the calculations with single peak near zero field, indicating that Stoner-Wohlfarth model can be well used to describe GMI characteristics for the anisotropy angle range of $20^\circ\leq\theta_k < 60^\circ$at the frequency of 10 MHz in Co-based amorphous ribbons.
Size and Aspect Ratio Effects on the Magnetic Properties of a Spin-Valve Multilayer by Computer Simulation
Lim, S.H. ; Han, S.H. ; Shin, K.H. ; Kim, H.J. ;
Journal of Magnetics, volume 5, issue 3, 2000, Pages 90~98
The change in the magnetic properties of a spin-valve multilayer with the structure IrMn (9 m)/CoFe (4 nm)/Cu (2.6 nm)/CoFe (2 nm)/NiEe (6 nm) is investigated as a function of the size and the aspect ratio. At a fixed aspect ratio (the length/width ratio) of 2, the magnetostatic interactions begin to affect the magnetic properties substantially at a spin-valve length of 5
, and, at a length of 1
, they become even more dominant. In the case of a fixed multilayer size (2.4
) which is indicated by the sum of the length and the width, magnetization change occurs by continuous spin-reversal and M-H loops are characterized by no or very small hysteresis at aspect ratios smaller than unity, At aspect ratios greater than unity, magnetization change occurs by spin-flip resulting in squared hysteresis loops. A very large changes in the coercivity and the bias field is observed, and these results are explained by two separate contributions to the total magnetostatic interactions: the coercivity by the self-demagnetizing field and the bias field by the interlayer magnetostatic interaction field.
Oxygen Stoichiometry Modification by
-Plasma Treatment in
Kim, H. S. ; Lee, C. H. ; Lee, Cheol-Eui ; Y. H. Jeong ; N. H. Hur ;
Journal of Magnetics, volume 5, issue 3, 2000, Pages 99~101
Oxygen-plasma effects of single crystal and thin film samples of
have been studied. Our resistivity measurements indicate that oxygen plasma treatment gives rise to oxygen diffusion into bulk regions, which results in a decrease of
concentration in oxygen nonstoichiometric
and in the activation energies of Holstein's small polarons in the paramagnetic region.
Ultra-Soft Magnetic Properties in Nanocrystalline
Lee, Heebok ; Lee, Kyeong-Jae ; Kim, Yong-Kook ; Yoon, Sung-Ho ; Kim, Taik-Kee ; Yu, Seong-Cho ;
Journal of Magnetics, volume 5, issue 3, 2000, Pages 102~105
The extremely soft magnetic behaviors in the nanocrystalline
alloy annealed at 450
for 1 hour in a vacuum were investigated by means of the magnetoimpedance (MI) effect and the incremental permeability. Because the MI effect can be obtained only in ultra-soft magnetic materials, the improvement of magnetic softness by proper thermal treatment was carefully monitored by the MI effect for all annealed samples. The changes of the incremental permeability as a function of an external field were also measured to verify the magnetic softness along with the MI measurement.
Taguchi Parameter Design for the Fabrication Process of Anisotropic NdFeB Magnet by Single Stroke Hot Deformation
Ying Li ; Kim, Y. B. ; Wang, Lin-shan ; Kim, M. J. ; M. S. Song ; J. H. Yang ; D. S. Suhr ; Kim, T. K ; Kim, C. O. ;
Journal of Magnetics, volume 5, issue 3, 2000, Pages 106~109
The single stroke hot deformation is a simple method fur the fabrication of anisotropic NdFeB magnets. In order to obtain the optimum conditions, Taguchi method of experimental design was applied in this work. The optimum conditions obtained on the basis of coercivity in Taguchi analysis was a little different from those of remanence and maximum energy Product. The contribution of each factor to magnetic Properties was calculated in detail.