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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 11, Issue 6 - Dec 2001
Volume 11, Issue 5 - Oct 2001
Volume 11, Issue 4 - Aug 2001
Volume 11, Issue 3 - Jun 2001
Volume 11, Issue 2 - Apr 2001
Volume 11, Issue 1 - Feb 2001
Selecting the target year
Fabrication of RF Inductor Using FeTaN Patterned Soft Magnetic Films
Journal of the Korean Magnetics Society, volume 11, issue 6, 2001, Pages 239~244
Recently, RF inductor having researched by many workers, we fabricated and investigated properties of RF inductors. In order to improve the Q-factor (Quality), we try to apply the patterned Fe
soft magnetic thin film of 5000 which shows magnetic anisotropy of 30 Oe. Thus, patterned magnetic film was artificially increased magnetic anisotropy lead to increasing of ferro-magnetic resonance frequency up to GHz band. Coil as part of inductor was fabricated by lift off process. The dimension of RF inductor was designed 47un, rectangular shape, and measured properties. In the case of Ti/Ag air core type inductor shows Q of 9, inductance of 8.4 nH at 2 GHz. Magnetic film employed inductor shows inductance of 9 nH and FMR resonance frequency was 700 MHz.
Experimental Study of Natural Convection for Magnetic Fluids in Annular Pipes Under the Influence of External Magnetic Fields
Journal of the Korean Magnetics Society, volume 11, issue 6, 2001, Pages 245~249
Natural convection of a magnetic fluid is different from that of Newtonian fluids because magnetic body force exists in an addition to gravity and buoyancy. In this paper, natural convection of a magnetic fluids (W-40) in annular pipes was studied by experimentally. Inside wall was kept at a constant temperature (25
), and outside wall was also held at a constant but lower temperature (20
). The magnetic fields of various magnitude were applied up. This study has resulted in the following fact that the natural convection of a magnetic fluids was controlled by the direction and intensity of the magnetic fields.
Magnetic Properties of NdFeB Permanent Magnets Fabricated by CAPA Process with Melt-spun Powder
Journal of the Korean Magnetics Society, volume 11, issue 6, 2001, Pages 250~255
Magnetic properties of the isotropic and anisotropic NdFeB magnets obtained by the Current-Applied Pressure-Assisted (CAPA) process from a melt-spun NdFeB powder were investigated using B-H loop analyser. The coercivity of the isotropic magnets is sensitive to the applied pressure in the CA-pressing and increases with increasing the pressure. The remanence of the anisotropic magnet increases with increasing the degree of deformation, and it results in the increase of a maximum energy Product. The best magnetic Properies of the isotropic and anistropic magnet are B
r/= 8.7 kG,
c/= 16.9 kOe, (BH)
max/= 16.5 and B
r/= 13.6 kG,
c/= 10.9 kOe, (BH)
max/= 44.2 MGOe, respectively.
Magnetic Properties of Zn and La-Zn Substituted Strontium Ferrite
Journal of the Korean Magnetics Society, volume 11, issue 6, 2001, Pages 256~261
These experiments were carried out to examine the effects of element substitution of Zn and La-Zn for Sr-ferrite. The calcined properties of Zn and La-Zn element substitution were examined, and also the sintered magnetic properties were compared with the stoichiometric condition. The magnetization properties of calcined SrM materials is as follows; M
s/ : 61.06 emu/g. Also, the magnetization properties of calcined Zn
0.3/-SrM materials is as follows; M
s/ : 66.90 emu/g. The sintered magnetic properties of (La-Zn)
0.3/-SrM composition is as follows; B
r/ : 4.21 kG, BH
max/: 4.19 MGOe.
Magnetic Layer Thickness Dependence on Magnetic Switching volume of CoSm/Cr Thin Films
Journal of the Korean Magnetics Society, volume 11, issue 6, 2001, Pages 262~266
The magnetic switching volume is known as an important parameter to understand the magnetization reversal process, thermal stability of the written information and media noise. This parameter is influenced significantly by the microstructure of the magnetic layer as well as underlayer. Therefore, we fabricated CoSm/Cr thin films with varying magnetic layer thickness under constant sputtering by using a dc magnetic sputtering machine. The magnetic layer thickness effect on the magnetic switching volume have been studied by the means of magnetic viscosity and dc demagnetization remanence curve mesurements. From these measurements, we found that the switching volumes increased with increasing the magnetic layer thickness, whereas the coercivity showed different behavior. These may be a result of the increased intergranular coupling and the larger volume fraction of the magnetic layer.
Magnetic Properties of Mn and La-Mn Substituted Strontium Ferrite
Journal of the Korean Magnetics Society, volume 11, issue 6, 2001, Pages 267~271
These experiments were carried out to examine the effects of elemental substitution of Mn and La-Mn on Sr-ferrite. The calcined properties for the Mn and La-Mn substitution were examined, and the sintered magnetic properties were compared with the stoichiometric condition. The magnetic properties of calcined SrM and (La-Mn)
-SrM composition were as follows, respectively; M
: 61.06 emu/g,
: 4.45 kOe and M
: 61.06 emu/g,
: 4.46 kOe. Also, the sintered ferrite magnets of Mn
-SrM and [(La-Mn)
-SrM exhibited a similar properties to the stoichiometric composition but the coercivity of (La-Mn)
-SrM was decreased rapidly with x=0.5.
Analysis of Magnetic Multi-layers by RBS and PIXE
Journal of the Korean Magnetics Society, volume 11, issue 6, 2001, Pages 272~277
A spin valve structure of Ta/NiFe/CoFe/Cu/CoFe/Ru/CoFe/FeMn/Ta which has a synthetic antiferromagnet (CoFe/Ru/CoFe), was fabricated by using a magnetron sputtering system. The thickness and composition of magnetic free and pinned layers affect the magnetic properties such as exchange interaction strength of each layer and so on. Even though Rutherford Backscattering Spectrometry (RBS) has advantages of quantitative and non-destructive analysis, it is almost impossible to determine the thickness and composition of magnetic thin films using lBS because of its poor mass resolution for a higher atom number (Z>20). In this study, quantitative analysis of the element composition and thickness for the spin valve sample was performed by combining both Proton Induced X-ray Emission Spectrometry (PIXE), which is one of element specific analysis techniques, and grazing-exit RBS with a highly improved depth resolution and absolute quantitative analysis. For the quantitative analysis, standardization of PIXE was carried out with NiFe, CoFe, and FeMn layers, which are one of constituent layers of spin valve films. Through PIXE standardization and the aid of PHE experimental results of the spin valve sample, ire overlapped signal in a grazing-exit RBS spectrum were successfully resolved and the thickness of the Ru layer was determined with a resolution of ∼1 .
The Trend of Patent Application in Magnetism Part and the Filing of Patent Claim
Journal of the Korean Magnetics Society, volume 11, issue 6, 2001, Pages 278~284
Recently patented rights affect the competitive power of each country. Specially the situation of that country will be superiority if one country has lots of basic invention patents in advanced technology. In the near future, research results in universities or research institutes should be involved with patent application so that the investment of research funds improves our technology. Alloy is used to adjust magnetic characteristic in invention for magnetic recording medium. In this case there must be cautious in make out the patent claims of invention about such alloys. The patent for alloy invention is considered with following standard. (1) composition range and structure aspect according to the need of a composition metal (2)characteristics of the alloy and for use.