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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Magnetics Society
Journal Basic Information
Journal DOI :
The Korean Magnetics Society
Editor in Chief :
Volume & Issues
Volume 10, Issue 6 - Dec 2000
Volume 10, Issue 5 - Oct 2000
Volume 10, Issue 4 - Aug 2000
Volume 10, Issue 3 - Jun 2000
Volume 10, Issue 2 - Apr 2000
Volume 10, Issue 1 - Feb 2000
Selecting the target year
Magnetic Properties in Alternating Magnetic Field for the Sintered Ee-l7Cr-2M(M=Si, Nb, Mo) Alloys
Journal of the Korean Magnetics Society, volume 10, issue 6, 2000, Pages 269~273
Fe-l7Cr-2M(M=Si, Nb, Mo) alloy powder was prepared by plasma electrode rotating atomizer and than the alloy powder was formed and sintered. The particle shape of the Fe-l7Cr-2M(M=Si, Nb, Mo) alloy power is spherical. The saturation magnetization of the sintered Fe-17Cr-2Mo and Fe-l7Cr-2Nb alloy are 155 emu/g. The saturation magnetization of the sintered Fe-l7Cr-2Si alloy is less than that of the sintered Fe-l7Cr-2Mo and Fe-l7Cr-2Nb alloy. The amplitude relative permeability of the sintered Fe-l7Cr-2M(M=Si, Nb, Mo) alloy has the maximum value in the range of 3∼5 Oe applied field at forming pressure 12 ton/cm
, sintering temperature 1200
, and frequency 1 kHz. Power loss of the sintered Fe-l7Cr-2Nb alloy is 40 mW/cc at applied field, H
a/=5 Oe, and frequency, f=1 kHz. The power loss of the sintered Fe-l7Cr-2Nb alloy is a half of that of the sintered Fe-l7Cr-2Si and Fe-l7Cr-2Mo alloy.
Microstructure and Thermal Properties of Mn-Ir/Ni-Ee Exchange Biased Multilayers
Journal of the Korean Magnetics Society, volume 10, issue 6, 2000, Pages 274~279
The microstructure and thermal properties of the Mn-IriNi-Fe exchange biased multi-layers with various buffer layers and stacking structures have been investigated. The H
and the T
depend on the Mn-Ir grain size at the interface between the Mn-Ir layer and the Ni-Fe layer, The (111) preferred orientation of Mn-Ir/Ni-Fe on the Ta buffer layer may promote the values of J
. The samples which produce the Hex have the epitaxial relationship at the interface between the Mn-Ir layer and the Ni-Fe layer due to the generation of misfit dislocation.
Magnetic properties of NdEeB thin films with perpendicular anisotropy
Journal of the Korean Magnetics Society, volume 10, issue 6, 2000, Pages 280~294
[(300nm)Ta/(500nm)NdFeB/(300nm)Ta] thin films were deposited at 5 mTorr Ag gas pressure by RF-DC magnetron sputtering, and their magnetic properties were investigated. The [Ta/NdFeB/Ta] films deposited on heated Si substrates showed high perpendicular anisotropy and excellent hard magnetic properties. The films sputtered at tile substrate temperature of T
max/=20 MGOe and
c/= 18.9 kOe along the perpendicular direction to the film plane, respectively.
Influences of Oxygen Partial Pressure and Annealing Time on Microstructure and Magnetic Properties of Hexagonal Barium-Ferrite Thin Films
Journal of the Korean Magnetics Society, volume 10, issue 6, 2000, Pages 285~290
BaM thin films were prepared by using RF magnetron sputtering system at room temperature, and then successively annealed to crystallize at 850
using RTA. The structure and magnetic properties of post-annealed BaM films have been investigated using XRD and VSM, respectively. The dependences of partial oxygen gas pressure (Po2) on the characteristics of BaM films were investigated. Although mixing of spinel and BaM phase only was identified in 0.5 mTorr oxygen partial pressure, BaM phase only was identified in the range from 1 to 3 mTorr oxygen partial pressure. The saturation magnetization and perpendicular coercivity of BaM thin films decreases with increase of Po2 in the range of Pot between 0.5 and 3 mTorr.
Effect of Residual Impurity on Magnetic Properties of the Permalloy Soft Magnet by Powder Injection Molding
Journal of the Korean Magnetics Society, volume 10, issue 6, 2000, Pages 291~296
The manufacturing method of permalloy soft magnet with the Ni contents of 46.6 and 47.2 wt% was investigated by powder injection molding technology. The magnetic properties of permalloy were greatly affected on the residual carbon and oxygen content of the sintered magnet. Solvent extraction and thermal debinding process to minimize the residual carbon content in sintered magnet were developed by controlling the debinding atmosphere. The residual carbon content depends on the debinding condition of the binder system for powder injection molding and the residual oxygen content on the sintering atmosphere. The sintered magnet produced by powder injection molding process had a 50 ppm. residual carbon, 150 ppm. residual oxygen. The coercivity and maximum relative permeability of permalloy soft magnet were 0.46 Oe and 14,600 respectively.
Development of Coercivity Measuring System for Ferromagnetic Materials in Open Magnetic Circuit
Journal of the Korean Magnetics Society, volume 10, issue 6, 2000, Pages 297~301
Coercivity is defined as the magnetic field strength required to reduce the magnetic polarization to zero of magnetic specimen which has been previously magnetized to saturation. This quantity is a reference for classifying soft and hard magnetic materials. We have constructed the measuring system for measurement of coercivity of ferromagnetic materials in open magnetic circuit. The measurement range of the constructed system is from tens A/m to tens kA/m, the combined uncertainty is
0.22 kA/m as coercivity is 14.63 kA/m.
Inspection of Non-metallic Inclusions in Thin Steel Sheets Using Magnetic Flux Leakage Method
Journal of the Korean Magnetics Society, volume 10, issue 6, 2000, Pages 302~309
An MFL (Magnetic Flux Leakage) testing system has been developed in order to inspect the non-metallic inclusions in the thin steel sheets. We have made a differential type flux-gate magnetometer using the measurement of apparent coercive field strength of soft magnetic core. The specifications of the electromagnet was determined using FEM software, and MFL testing system with 3 axis degree of freedom was constructed. The feasibility testing for non-metallic inclusion was shown using the system. By digitizing MFL signal and using 2-D graphic display, we could identify various surface defects other than the inclusions.
Sensitivity and Rejection Capability of Thermal Asperity Induced by Sub-Micron Contamination Particles
Journal of the Korean Magnetics Society, volume 10, issue 6, 2000, Pages 310~317
With use of (G)MR head, thermal asperity (TA) has been a big concern in drive industry. In this study, we investigated several factors of heads and disks which affects the TA sensitivity of the drive. TA experiments were conducted by introducing the particles on the drives using a particle injection chamber. It was found that the slider ABS shape can help to reduce TA or contamination in the head/media interface. However, TA sensitivity of the drive mainly depend on the intrinsic property of (G)MR sensor. GMR head is much less sensitive to TA compared with MR head. However, in case that the same bias current was applied for both of MR and GMR head, TA sensitivity of GMR head became almost identical to that of MR head. Therefore it was found that the bias current is a dominant factor in determining TA sensitivity of the head. TA sensitivity of different types of disks was also studied. The scratch resistance of the carbon overcoat layer is the one of the main factors which influence TA rejection capability of the disks.