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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
Editor in Chief :
Volume & Issues
Volume 3, Issue 4 - Dec 1998
Volume 3, Issue 3 - Sep 1998
Volume 3, Issue 2 - Jun 1998
Volume 3, Issue 1 - Mar 1998
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An Open Gradient Magnetic Separator Assembled Using NdFeB Magnets for a Use of Fine Particles Remover
Park, Eon-Byung ; Choi, Seung-Duck ; Yang, Choong-Jin ; Lee, Won-Sub ;
Journal of Magnetics, volume 3, issue 3, 1998, Pages 69~73
A drum type magnetic separator was designed and optimized by computer simulation. The separator consisted of rotating outer shell of drum, magnetic flux generator drum which was assembled with numbers of disk type magnet holders, and drum axis around which the magnet holders were fixed. NdFeB magnet blocks were inserted into the disks, and the disks were assembled layer by layer along the drum axis. Magnetic circuits of the separator were simulated on the basis of highest magnetic strength, least cost, and high yield of separation by using a Vector Field S/W employing the Opera-2D program. The separator proved a separation yield of 95% in removing fine iron-base particles, and installed at Hot Rolling Mill of Pohang Iron & Steel Co. In Korea.
A Semi-graphical Analysis on the Sublattice Anisotropy of a Two Sublattice System with Uniaxial Anisotropy: Application to Pr2Fe14B
Kim, Y.B. ; Jin-Han-Min ;
Journal of Magnetics, volume 3, issue 3, 1998, Pages 74~77
A method to analyze the anisotropy constants of a two sublattice system with uniaxial anisotropy has been investigated by extending the Sucksmith and Thompson's method to higher order anisotropy terms. Using the method, a set of anisotropy constants for Pr-sublattice of
The magnetization calculated by an energy minimum method by using the sublattice anisotropy constants well reproduced the experimental results and satisfied the simulation assumptions.
Novel Properties of Boron Added Amorphous Rare Earth-transition Metal Alloys for Giant Magnetostrictive and Magneto-optical Recording Materials
Jai-Young Kim ;
Journal of Magnetics, volume 3, issue 3, 1998, Pages 78~81
Large magneto crystalline anisotropy energy and demagnetization energy of rare earth-transition metal (RF-TM) alloys play roles of bottlenecks towards their commercial applications for giant magnetostrictive and blue wavelength magneto optical recording materials, respectively. To solve the above problems, boron is added into amorphous RE-TM alloys to produce its electron transferring. The boron added amorphous RE-TM alloys show novel magnetic and magneto-optical properties as follows; 1) an amorphous
97B3 alloy obtains the magnetostriction of
at 400 Oe compared with saturation magnetostriction of
in conventional Ni based alloys, 2) an amorphous
alloy increases effective magnetic anisotropy to
without boron, which correspond to the polar Kerr rotation angles of 0.52
, respectively. These results attribute to selective 2p-3d electron orbits exchange coupling (SEC).
Characteristics of HTS SQUID-based Susceptometer
Timofeev, V.P ; Kim, C.G ; Shnyrkov, V.I ;
Journal of Magnetics, volume 3, issue 3, 1998, Pages 82~85
A portable HTS RF SQUID-based system, weighing less than 20 kg has been built for susceptometry applications in weak magnetic fields, It includes a YBCO sensor for measuring the axial magnetic field component with a resolution of about
This is determined by the intrinsic magnetic noise in the quasi-white noise region. There is a relaxation for a sudden increase in field due to magnetic flux creep in HTS. In this instance the time did not exceed 3~5 minutes.
Susceptometry Application of Portable HTS SQUID-Based System
Timofeev, V.P. ; Kim, C.G. ; Shnyrkov, V.I. ;
Journal of Magnetics, volume 3, issue 3, 1998, Pages 86~88
A portable RF HTS SQUID-based susceptometer was used for small size magnetized sample testing in weak DC (up to 200A/m) and AC (up to 4 A/m) magnetic fields. The system resolution for the magnetic moment is of the order of
. The measured DC susceptibility of a tested sample agrees well with the value obtained by using a commercial liquid helium susceptometer.
The Effect of Pinholes on Magnetic Behaviour of Antiferromagnetically Coupled Ni-Fe/Cu Mulitlayers
Stobiecki, F ; Lucinski, T ; Dubowik, J ; Szymanski, B ; Urbaniak, M ; Castano, F.J ; Stobiecki, T ;
Journal of Magnetics, volume 3, issue 3, 1998, Pages 89~91
The magnetisation behaviour of polycrystalline permalloy/copper multilayers with mixed antiferromagnetic/ferromagnetic coupling was investigated as function of temperature. The results are discussed in a framework of a realistic model of anitferromagnetically coupled layers connected by ferromagnetic pinholes. A microstructure of pinholes (their density and dimensions) was varied either by a proper annealing treatment or by choosing samples with various Cu spacer thicknesses. It was demonstrated that the temperature changes of the net magnetic moment measured in a magnetic field smaller than the saturation field was strongly affected by the composition of the pinholes, their density, cross-sectional area and their lengths.
The Structure, and the Magnetic and Magnetoresistive Characteristics of the Spin Valve Multilayers
Stobiecki, T. ; Czapkiewicz, M. ; Wrona, J. ; Powroynik, W. ; Stobiecki, F. ;
Journal of Magnetics, volume 3, issue 3, 1998, Pages 92~95
In this paper we report the low and high angle diffraction results, and the magnetic and magnetroesistive characteristics of the spin valve multilayer structure prepared by the sputter machine Emerald II in the Balzers Laboratory. The investigated system consists of a ferromagnetic free layer (7 nm NiFe) and a ferromagnetic pinned layer (7 nm NiFe), separated from each other by a nonmagnetic (2.1 nm Cu) spacer. The NiFe pinned layer is fixed by the exchange coupling with an antiferromagnetic layer (10 nm FeMn). For such system the magnetoresistance ratio ΔR/R=3.58%, the interlayer exchange coupling
Oe and the field sensitivity 1.15%/Oe were otained.
Barium Ferrite Media for Extremely High Density Recording Applications
Yang-Ki Hong ; Hong-Sik Jung ;
Journal of Magnetics, volume 3, issue 3, 1998, Pages 96~98
In this paper a structurally coupled and magnetically decoupled Ba-ferrite thin film medium is proposed to evade the superparamagnetic limit and reduce media noise. The proposed medium consists of ferrimagnetic Ba-ferrite nano-grains (< 10 nm) and a non-magnetic grain boundary material. Magnetic grains are crystallographically matched with the grain boundary material. Spherical or cubic shaped Ba-ferrite particle is also proposed for above 100 Kfci particulate recording application.