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Jalli, Jeevan,Hong, Yang-Ki,Bae, Seok,Lee, Jae-Jin,Abo, Gavin S.,Lyle, Andrew,Gee, Sung-Hoon,Lee, Hwachol,Mewes, Tim,Sur, Jeong-Chul,Lee, Sung-Ik American Institute of Physics 2009 JOURNAL OF APPLIED PHYSICS - Vol.105 No.7
<P>Liquid phase epitaxy technique was used to grow 144 mu m thick barium ferrite (BaFe12O19; BaM) single crystalline films on (111) Gd3Ga5O12 substrate. The growth rate of 72 mu m/h was achieved with a flux system of Fe2O3-BaCO3-Na2CO3. The grown BaM films show single crystalline (000l) orientation that was confirmed by x-ray diffraction and magnetic torque curves. The saturation magnetization (4 pi M-s) and the anisotropy field (H-k) were found to be 4.2 kG and 16.0 kOe, respectively. The ferrimagnetic resonance linewidth (Delta H) at 35 GHz was measured to be 0.1 kOe. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3062824]</P>
Joghee Nanjundan,Channappa Manjunatha,Jalli Radhamani,Ajay Kumar Thakur,Rashmi Yadav,Arun Kumar,Mohan Lal Meena,Rishi Kumar Tyagi,Devender Kumar Yadava,Dhiraj Singh 한국식물병리학회 2020 Plant Pathology Journal Vol.36 No.2
Powdery mildew of Indian mustard (Brassica juncea), caused by Erysiphe cruciferarum, is emerging as ma- jor problem in India. All the Indian mustard cultivars presently grown in India are highly susceptible to pow- dery mildew and so far no resistance source has been reported. In this study, with an aim to identify resistant source, 1,020 Indian mustard accessions were evaluated against E. cruciferarum PMN isolate, at Wellington, The Nilgiris, Tamil Nadu, India under natural hot spot conditions. The study identified one accession (RDV 29) with complete resistance against E. cruciferarum PMN isolate for the first time, which was consistent in five independent evaluations. Genetic analysis of F1, F2 and backcross populations obtained from the cross RSEJ 775 (highly susceptible) × RDV 29 (highly resistant) for two season revealed that the resistance is governed by two genes with semi-dominant and gene dosage effect. Further, a new disease rating system using six scales (0, 1, 2, 3, 4, and 5) has also been proposed in this study to score powdery mildew based on progress of fungal growth in different plant parts of the F2 population. The outcome of this study viz. newly identified powdery mildew-resistant Indian mustard accession (RDV 29), information on inheritance of resistance and the newly developed disease rating scale will provide the base for development of powdery mildew-resistant cultivars of Indian mustard.
Gavin S. Abo,Yang-Ki Hong,Jeevan Jalli,Jaejin Lee,Jihoon Park,Seok Bae,Seong-Gon Kim,Byoung-Chul Choi,Terumitsu Tanaka 한국자기학회 2012 Journal of Magnetics Vol.17 No.1
The coercivity of a single 27 nm-spherical barium ferrite (S-BaFe) particle was simulated using three models: 1) Gibbs free energy (GFE), 2) Landau-Lifshitz-Gilbert (LLG), and 3) Stoner-Wohlfarth (S-W). Spherically and hexagonally shaped particles were used in the GFE and LLG simulations to investigate coercivity with the different shape anisotropies. The effect of shape was not included in the S-W model. It was found that the models using a spherical shape resulted in a coercivity higher than the models using the hexagonal shape with both shapes having the same diameter. The coercivity estimated with the S-W model was approximately the same as that for the spherical-shape models, which indicates that spherical shape has no significant effect on the particle’s coercivity at nanoscale.
Jae-Jin Lee,Yang-Ki Hong,Seok Bae,Jalli, J.,Abo, G.S.,Won-Mo Seonug,Won-Gi Ahn,Sang-Hoon Park,Chul-Jin Choi,Jung-Goo Lee IEEE 2009 IEEE transactions on magnetics Vol.45 No.10
<P>Ni<SUB>x</SUB>Zn<SUB>0.8-x</SUB>Cu<SUB>0.2</SUB>Fe<SUB>2</SUB>O<SUB>4</SUB> ferrites with various composition (x = 0.45-0.79) were synthesized by the coprecipitation method for broadband and electromagnetic absorbing characteristics. Saturation magnetization decreased as the Ni content increased, while coercivity was elevated. It was found that calculated reflection loss and fractional bandwidth (FBW) changed with the matching thickness and chemical composition of the ferrite. Minimum reflection loss (RL) of -47.05 dB and FBW of 105% were observed at 1 GHz for Ni<SUB>0.45</SUB>Zn<SUB>0.35</SUB>Cu<SUB>0.2</SUB>Fe<SUB>2</SUB>O<SUB>4</SUB>, which are competitive to those of conventional ferrite and ferrite rubber composite absorbers.</P>
Optimized Design of Low Voltage High Current Ferrite Planar Inductor for 10 ㎒ On-chip Power Module
Seok Bae,Yang-Ki Hong,Jae-jin Lee,Gavin Abo,Jeevan Jalli,Andrew Lyle,Hongmei Han,Gregory W. Donohoe 한국자기학회 2008 Journal of Magnetics Vol.13 No.2
In this paper, design parameters of high Q (> 50), high current inductor for on-chip power module were optimized by 4 Xs 3 Ys DOE (Design of Experiment). Coil spacing, coil thickness, ferrite thickness, and permeability were assigned to Xs, and inductance (L) and Q factor at 10 ㎒, and resonance frequency (?r) were determined Ys. Effects of each X on the Ys were demonstrated and explained using known inductor theory. Multiple response optimizations were accomplished by three derived regression equations on the Ys. As a result, L of 125 nH, Q factor of 197.5, and ?r of 316.3 ㎒ were obtained with coil space of 127 ㎛, Cu thickness of 67.8 ㎛, ferrite thickness of 130.3 ㎛, and permeability 156.5. Loss tan δ = 0 was assumed for the estimation. Accordingly, Q factor of about 60 is expected at tan δ = 0.02.
Novel Ni-Mn-Co ferrite for gigahertz chip devices
Lee, J. J.,Bae, S.,Hong, Y. K.,Jalli, J.,Abo, G. S.,Seong, W. M.,Park, S. H.,Choi, C. J.,Lee, J. G. American Institute of Physics 2009 JOURNAL OF APPLIED PHYSICS - Vol.105 No.7
<P>The effect of Mn and/or Co doping in Ni-Mn-Co ferrite on the static, dynamic magnetic properties, and thermal magnetic stability were investigated for high frequency microwave applications up to the gigahertz range. Saturation magnetization and coercivity increased with increased substitution of Mn and Co, respectively. Both Mn and Co substituted Ni-Mn-Co ferrite exhibited higher thermal stability factor rather than Ni-Mn and Ni-Co ferrites. The highest thermal stability factor was achieved to be -12.0 X 10(-4) degrees C/ppm for Ni0.93Mn0.05Co0.02Fe2O4. The second highest, -11.88 X 10(-4) degrees C/ppm, was measured for Ni0.7Mn0.05Co0.02Fe2.23O4. Permeability (mu), permittivity (epsilon), and cutoff frequency of Ni0.93Mn0.05Co0.02Fe2O4 and Ni0.7Mn0.05Co0.02Fe2.23O4 showed 7.41, 4.56, 1084 MHz, and 3.87, 4.55, 1436 MHz, respectively. Furthermore, the mu/epsilon ratio of Ni0.93Mn0.05Co0.02Fe2O4 was found to be 1.63 (mu/epsilon = 7.41/4.56). (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3068023]</P>
Seok Bae,Yang-Ki Hong,Jaejin Lee,Jihoon Park,Jeevan Jalli,Gavin S. Abo,Hyuck M. Kwon,Chandana K. K. Jayasooriya 한국자기학회 2013 Journal of Magnetics Vol.18 No.1
A pulsed ferrite magnetic field generator (FMFG) was designed for the use in the 1000 m long through-theearth (TTE) communication system for mining disaster situations. To miniaturize the TTE system, a ferrite core having 10,000 of permeability was used for the FMFG. Attenuation of the magnetic field intensity from the FMFG (200-turn and 0.18 m diameter) was calculated to be 89.95 ㏈ at 1000 m depth soil having 0.1 S/m of conductivity. This attenuation was lower than 151.13 dB attenuation of 1 ㎑ electromagnetic wave at the same conditions. Therefore, the magnetic-field was found to be desirable as a signal carrier source for TTE communications as compared to the electromagnetic wave. The designed FMFG generates the magnetic field intensity of 1 × 10?¹? Tesla at 1000 m depth. This magnetic field is detectable by compact magnetic sensors such as flux gate or magnetic tunneling junction sensor. Therefore, the miniature FMFG TTE communication system can replace the conventional electromagnetic wave carrier type TTE system and allow reliable signal transmission between rescuer and trapped miners.
The Impact of MRS Phantom Container on the Quality of Spectrum Provided by 3T MRI
Mahdi Saeedi-Moghadam,Mehrzad Lotfi,Banafsheh Zeinali-Rafsanjani,Reza Jalli 한국자기학회 2020 Journal of Magnetics Vol.25 No.3
This study intended to evaluate the effect of the material of phantom-container on the MRS signal in 3T MRI. Three phantom-container consisting of clear laboratory-glass, PET-bottle, and falcon-tube was used. The metabolites contained 6 mM Cr and 3 mM Cho. FWHM and SNR of Cho and both peaks of Cr were calculated. FWHM of all the peaks of glass-phantom was 50.08 and 19.48 % fewer than those provided by PET and falcon-tube; also, the SNR of the all the peaks of the PET and falcon-tube were by average 77.99 and 91.18 % fewer than the peaks provided by glass-phantom. The laboratory-glass is a good material for building MRS phantoms since it does not affect the baseline-noise, FWHM, and SNR of the spectra. It was also revealed that the size of the phantom and the distance between the spectroscopy volume and phantom walls were important and can affect the baseline-noise.