Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Magnetics
Journal Basic Information
Journal DOI :
The Korean Magnetics Society
Editor in Chief :
Volume & Issues
Volume 4, Issue 4 - Dec 1999
Volume 4, Issue 3 - Sep 1999
Volume 4, Issue 2 - Jun 1999
Volume 4, Issue 1 - Mar 1999
Selecting the target year
Partitioning of Si in Fe-Zr-Si-B Nanocrystalline Alloys
Waniewska, A.Slawska ; Greneche, J.M. ; A.Inoue ;
Journal of Magnetics, volume 4, issue 1, 1999, Pages 1~4
The microstructure and magnetic properties of
nanocrystalline alloys were studied by magnetization measurements and M ssbauer spectrometry over a wide temperature range. Three well resolved spectral components have been found and attributed to bcc-Fe grains (with almost pure iron structure), residual amorphous matrix enriched with solute elements and interfaces formed at the grain-matrix boundaries. It has been shown that, contrary to the expectation, during crystallization the atomic segregation occurs leading to the formation of primary bcc-Fe grains and the partition of Si atoms into the residual amorphous matrix.
Effects of Sulfur Segregation on Tertiary Recrystallization Kinetics in Thin-gauged 3% Si-Fe Electrical Strip
Chai, K.H. ; Na, J.G. ; Heo, N.H. ; Kim, J.C. ; Lee, S.R. ; Woo, J.S. ;
Journal of Magnetics, volume 4, issue 1, 1999, Pages 5~9
Effect of sulfur segregation on tertiary recrystallization and magnetic induction during final annealing was investigated in a 3% Si-Fe electrical strip containing 6 ppm(LS) and 15 ppm(HS) sulfur. During final annealing, Auger peak height of segregated sulfur on the surface of the strips reached a maximum, and then decreased to low level with increasing annealing time, which is attributed to sulfur segregation and evaporation. The magnetic induction of the thin-gauged 3% Si strip was inversely proportional to the Auger peak height of segregated sulfur on the surface. The overall profile for surface segregation of sulfur and B10 was observed, irrespective of sulfur content in Si-Fe strips, but the peaks of LS strips appeared earlier than those of HS strips. The grain growth rate of the LS strips during final annealing was faster than that of the HS strips, which may be attributed to the pinning effects of segregated sulfur. With increasing final annealing temperature, B10 value increased rapidly and the saturation level in B10 increased.
The Magnetization Behavior of Amorphous Fe84-zNb7B8+xCu1 (x0, 1, 4) Alloys
Kim, Kyeong-Sup ; Moon, Young-Mo ; Lee, Jae-Bong ; Yu, Seong-Cho ; Lim, Woo-Young ;
Journal of Magnetics, volume 4, issue 1, 1999, Pages 10~12
We report the salient features of the magnetic properties of amorphous
(x=0, 1, 4) alloys. The study of dc-magnetization properties and the ac-susceptibility was carried out. The temperature dependence of the magnetization follows the predictions of spin wave excitations with long wavelengths. Especially, the addition of boron modifies the magnetic properties: the spin wave stiffness increases from 56.8 to 65.7 meV
2 and Curie temperature increases from 298 K to 352 K. This result indicates a magnetic hardening of the exchange interaction by higher exchange energy. Thus, the substitution of iron by boron favours the increase of magnetic order in this system.
Effects of Sweeping Rate on Magnetic Viscosity of Metal Evaporated Tape
Pyung Woo Jang ; Young Gu Yoo ; Kyung Ho Shin ;
Journal of Magnetics, volume 4, issue 1, 1999, Pages 13~16
Magnetic viscosities of a commercialized metal evaporated tape were measured as a function of sweeping rate in VSM at room temperature. Within several seconds in the viscosity measurement, curves are downward concave and more concave with increasing sweeping rate when magnetization were plotted as a logarithmic function of time. However, magnetization varied as a logarithmic function of time after several seconds. Magetic viscosity coefficient gradually increased with increasing sweeping rate and then kept a constant value at a rate faster than 61.5 Oe/s. It was supposed that magnetic viscosity occurs during field sweeping, which was in good agreement with Sharrock's model qualitatively. Activation volume decreased with increasing sweeping rate, which was due to the fact that magnetic viscosity coefficients increased with sweeping rate while irreversible susceptibilities were not affected by sweeping rate.
GMR and Magnetization Study of Sputtered Permalloy/Cu Multilayer: The Influence of Temperature, Thickness and Number of Magnetic Layer
Lucinski, T. ; Stobiecki, F. ; Urbaniak, M. ;
Journal of Magnetics, volume 4, issue 1, 1999, Pages 17~21
The GMR (
) oscillatory behaviour as well as the widths of first and the second antiferromagnetically coupled ranges of the Permalloy (
)/Cu multilayers have been found to be strongly affected not only by the presence of the superparamagnetic/paramagnetic entitles located at the Py/Cu interfaces but mainly by the existence of the magnetic bridges between Py layers. The effectiveness of the magnetic bridges has been found to be temperature dependent, leading to the temperature dependence of the remnant to saturation magnetization ratio (
). We have found that for Py/Cu multilayers with equal Py and Cu layer thicknesses a high field sensitivity of the GMR effect (0.4%/Oe) and negligible hysteresis can be achieved when the number of Py layers decreases from 100 to 6. Sensitivity can be further improved by increasing the Py layers thickness, but the hysterstic effect becomes more pronounced then.
Theoretical Interpretation of Positive Magnetoresistance in Permalloy Film
Sung, Gisuk ; Shalyguina, Elena-E. ; Shin, Kyung-Ho ;
Journal of Magnetics, volume 4, issue 1, 1999, Pages 22~25
Recently we reported the evolutionary transition from the positive magnetoresistance to the negative was discovered in the transverse configuration as the thickness of permalloy film increases. The discovered peculiarities of positive magnetoresistance phenomenal were explained in the framework of the uniform rotation model of the film magnetization reversal.
Thermomagnetic Characteristics of the Hard Magnetic Materials with a Fine Microstructure due to a HDDR Process
Kwon, H.W. ; Kim, Yoon-B. ; Jeung, W.Y. ;
Journal of Magnetics, volume 4, issue 1, 1999, Pages 26~32
The HDDR process can be used as an effective means of processing of the coercive Nd-Fe-B-type or the Sm2Fe17Nx materials. The HDDR (hydrogenation, disproportionation, desorption, recombination) processed materials are feartured with a very fine microstructure. The thermomagnetic characteristics of the Nd-Fe-B-type or the Sm2Fe17Nx materials with fine microstructure due to the HDDR process were investigated. It has been found that the fine-microstructured hard magnetic materials showed an unusual TMA (Thermomagnetic analysis) tracting featured with a low and constant magnetization at lower temperature range and a peak just below their Curie temperatures when a low external field is applied. This thermomagnetic characteristic was immediate particularly in the TMA with a low applied field. This thermomagnetic characteristic was interpreted in terms of the competition between two counteracting effects; the decrease in magnetication due to the thermal agitation at an elevated temperature and the increase in magnetization resulting from the rotation of magnetization of the fine grains comparable to a critical single domain size due to the decreased magnetocrystalline anisotropy at an elevated temperature.
Magnetic Semiconductors Thin Films-Unidirectional Anisotropy
Lubecka, M. ; Maksymowicz, L.J. ; Szymczak, R. ; Powroznik, W. ;
Journal of Magnetics, volume 4, issue 1, 1999, Pages 33~37
Unidirectional magnetic anisotropy field (
) was investigated for thin films of
0.2). This anisotropy originates from the microscopic anisotropic Dzyaloshinskii-Moriya (DM) interaction which arise from the spin-orbit scattering of the conduction electrons by the nonmagnetic impurities. This interaction maintains the remanent magnetization in the direction of the initial applied field. Then the single easy direction of the magnetization is parallel to the direction of the magnetic field. The anisotropy produced by field cooling is unidirectional I.e. the spins system deeps some memory of the cooling field direction. The chalcogenide spinel of
belongs to the class of the magnetic semiconductors. The magnetic disordered state is obtained when ferromagnetic structure is diluted by In. Then we have the mixed phase characterised by coexistence the magnetic long range ordering (IFN-infinite ferromagnetic network) and the spin glass order (Fc-finite clusters). The total magnetic anisotropy energy depends on the state of magnetic ordering. In our study we concentrated on the magnetic state with reentrant transition and spin glass state. The polycrystalline
thin films were obtained by rf sputtering technique. We applied the ferromagnetic resonance (FMR) and M-H loop techniques for determining the temperature composition dependencies of Han. From the experimental data, we have found that Han decreases almost linearly when temperature is increased and in the low temperature is about three times bigger at SG state with comparison to the state with REE.