Jiunn Chen

National Pingtung University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

D. J. Huang

National Yang Ming Chiao Tung University

Yi‐Shao Lai

Advanced Semiconductor Engineering (Taiwan)

S. C. Chung

Cell Biotech (South Korea)

Ping‐Feng Yang

Advanced Semiconductor Engineering (Taiwan)

C. F. Chang

Max Planck Institute for Chemical Physics of Solids

Wen‐Bin Wu

National Synchrotron Radiation Research Center

Jiann‐Shing Lee

National Pingtung University

Hua‐Shu Hsu

National Pingtung University

Chun-Rong Lin

National Pingtung University

Shin‐Guang Shyu

Institute of Chemistry, Academia Sinica

Cooperative Institutions

National Synchrotron Radiation Research Center

National Sun Yat-sen University

Advanced Semiconductor Engineering (Taiwan)

National Cheng Kung University

National Pingtung University

National Tsing Hua University

National Taiwan University

National Yang Ming Chiao Tung University

National University of Kaohsiung

Tamkang University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Orbital magnetic moments of oxygen and chromium inCrO2

Physical review. B, Condensed matter (2002)

D. J. Huang Horng‐Tay Jeng C. F. Chang Guang‐Yu Guo Jiunn Chen

With measurements of the magnetic circular dichroism and band-structure calculations in the local spin density approximation (LSDA+U) approach, we revealed that the orbital moment of O in ${\mathrm{CrO}}_{2}$ is ferromagnetically coupled to that of Cr, whereas the spin moment of O is antiferromagnetically coupled to that of Cr. Spin and orbital magnetic moments of Cr and O are enhanced as Coulomb interaction energy U increases. Comparing the magnetic circular diachromism data with the LSDA+U calculations, we conclude that it is essential to include the on-site Coulomb energy for adequately describing the orbital magnetic moments of ${\mathrm{CrO}}_{2}.$

10.1103/physrevb.66.174440

Cite

Citations (40)

Redistribution in wafer level chip size packaging technology for high power device applications: Process and design considerations

Microelectronics Reliability (2009)

Jiunn Chen Yi‐Shao Lai Chueh-An Hsieh Chia Yi Hu

Chip-scale package

Redistribution

Wafer-level packaging

10.1016/j.microrel.2009.10.004

Cite

Citations (4)

Multipeak fitting analysis of Raman spectra on DLCH film

Journal of Raman Spectroscopy (2009)

F. C. Tai S. C. Lee Jiunn Chen Chehung Wei Shih‐Hsien Chang

Abstract The hydrogenated diamond‐like carbon (DLCH) film with 1‐µm thickness is deposited by direct hydrocarbon gas ion beam method on silicon wafer and annealed at 400 °C. Detailed Raman spectra feature are fitted from nine sets of different peak fitting functions, including Gaussian, Lorentzian and Breit‐Wigner‐Fano (BWF) functions. These fitting results obtained from a two‐peak combination show some specific variances on the G peak position, FWHM G and I D / I G ratio for as‐deposited and as‐annealed DLCH films. The most popular two‐peak fitting method with full Gaussian function tends to exhibit a higher ratio of the G peak position shift and higher I D / I G ratio than others fitting methods, the drastic difference among the most popular G (G) & G (D) and B (G) & L (D) schemes also have brought out in I D / I G ratio. However, for a more complex four‐peak Gaussian function fitting Raman spectra, the I D / I G ratio is close to that of a two‐peak fitting function with a mixture functions of BWF (G) and L (D). Furthermore, a series of systematic peak fitting procedures and comparisons of Raman spectra have been discussed in this study. Copyright © 2009 John Wiley & Sons, Ltd.

Position (finance)

10.1002/jrs.2234

Cite

Citations (107)

Spin-dependent optical charge transfer in magnetite from transmitting optical magnetic circular dichroism

Physical review. B./Physical review. B (2018)

Jiunn Chen Hua‐Shu Hsu Ya-Huei Huang D. J. Huang

In this study, we demonstrate that optical magnetic circular dichroism (OMCD) in Faraday geometry can serve as an effective means of characterizing the valence electronic structure of magnetic oxide systems. Molecular-beam-epitaxy-grown magnetite thin film single crystals served as the test sample. The dominant spin channels of optical charge transfer were resolved from transmitting OMCD spectra, which can only be interpreted by considering electron correlation effects and including polarized $2p$ oxygen. First-principles calculations based on density-functional theory with Hubbard-$U$ correction ($\mathrm{DFT}+U$) were performed on cubic inverse spinel ${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}$ ($\mathrm{F}d\overline{3}m$). We determined that the main features of optical conductivity [S. K. Park et al., Phys. Rev. B 58, 3717 (1998)] were similar to those of a Mott-Hubbard insulator. According to the extent of $2p$ character in the mixed $\mathrm{Fe}(3d)\ensuremath{-}\mathrm{O}(2p$) valence that engendered the relaxation of Laporte selection, we classified dominant optical charge transfer into three categories: (1) intervalence spin-minority $d\ensuremath{-}d$ charge transfer relax from lattice distortion; (2) intersublattice $d\ensuremath{-}d$ charge transfer across the valence gap of spin majority; and (3) ligand-to-metal $p\ensuremath{-}d$ charge transfer across the valence gap of spin minority. We conclude that the transmitting OMCD spectrum can generally reflect the competition between optical transitions from the $B$-site $\mathrm{Fe}(3d$) spin majority and the $\mathrm{O}(2p$) spin minority. Finally, we found the OMCD signal of magnetite exhibited similar trend to the valence band spin polarization deduced from Mott spin polarimetry. Excitation spectrum that access the direct information about the ``bare'' electronic states from soft x-ray spin-resolved photoemission were also revisited.

Optical conductivity

10.1103/physrevb.98.085141

Cite

Citations (23)

Performance of a Mott detector for undulator-based spin-resolved spectroscopy

Review of Scientific Instruments (2002)

D. J. Huang Wen-Bin Wu Jiunn Chen C. F. Chang S. C. Chung

To measure spin-polarized core-level electron spectra, a spectrometer equipped with a highly efficient retarding-potential Mott spin polarimeter using undulator-based soft-x-ray beamlines has been set up. With a thin film of Au as a target this polarimeter has an efficiency estimated to be ∼2×10−4. The performance of this system for spin-polarized spectroscopy has been tested using core-level spin-polarized photoemission of magnetic and nonmagnetic thin films excited with linearly and circularly polarized light, respectively. Measurements using a new spin-resolved absorption technique are also discussed.

Polarimeter

Undulator

10.1063/1.1510552

Cite

Citations (18)

Identification of mechanical properties of Cu<inf>6</inf>Sn<inf>5</inf>, Cu<inf>3</inf>Sn, and Ni<inf>3</inf>Sn<inf>4</inf> intermetallic compounds using nanoindentation

Ping‐Feng Yang Yi‐Shao Lai Sheng‐Rui Jian Jiunn Chen Rongsheng Chen

We report in this paper Young's moduli and hardness of Cu 6 Sn 5 , Cu 3 Sn, and Ni 3 Sn 4 intermetallic compounds (IMCs) measured by nanoindentation. The samples were prepared by annealing Sn-Cu and Sn-Ni diffusion couples. Indentations performed along the directions lateral and perpendicular to the IMC layers show statistically indistinguishable Young's moduli and hardness for each of the three IMCs, implying that these polycrystalline IMC aggregates are rather isotropic. Nanomechanical responses of the IMCs were shown to depend greatly on the strain rate during loading while independent of the strain rate during unloading. Multiple pop-in events were observed for Cu 6 Sn 5 during loading at a strain rate lower than about 0.1 s ⁻¹ to 0.5 s ⁻¹ .

Identification

10.1109/impact.2007.4433598

Cite

Citations (1)

Magnetic enhancement of carbon-encapsulated magnetite nanoparticles

Journal of Alloys and Compounds (2019)

Jiann‐Shing Lee Yuan-Jhe Song Hua‐Shu Hsu Chun-Rong Lin J. C. A. Huang

Ferrimagnetism

Superparamagnetism

Coprecipitation

Carbon fibers

Maghemite

Amorphous carbon

10.1016/j.jallcom.2019.03.191

Cite

Citations (21)

Mechanical Properties ofCu6Sn5, Cu3Sn, andNi3Sn4 Intermetallic CompoundsMeasured by Nanoindentation

Ping‐Feng Yang Yi‐Shao Lai Sheng‐Rui Jian Jiunn Chen

We report inthis paper Young's moduli andhardness of Cu6Sn5, Cu3Sn, andNi3Sn4 intermetallic compounds (IMCs) measured bynanoindentation. Thesamples wereprepared by annealing Sn-CuandSn-Nidiffusion couples. Indentations performed along thedirections lateral andperpendicular to theIMClayers showstatistically indistinguishable Young's moduli andhardness foreachofthethree IMCs,implying thatthesepolycrystalline IMC aggregates arerather isotropic. Nanomechanical responses oftheIMCswere showntodepend greatly onthestrain rateduring loading whileindependent ofthestrain rateduring unloading. Multiple pop-in events wereobserved forCu6Sn5 during loading atastrain ratelower thanabout 0.1s-1 to0.5s-1. Topographies oftheresidual impressions werequantitatively measured andthepile-up features wereapparent forthethree IMCs.

Source

Cite

Citations (0)

Investigation of growth behavior of Al–Cu intermetallic compounds in Cu wire bonding

Microelectronics Reliability (2010)

Jiunn Chen Yi‐Shao Lai Yi-Wun Wang C. R. Kao

10.1016/j.microrel.2010.09.034

Cite

Citations (50)

Electromigration Reliability and Morphologies of Cu Pillar Flip-Chip Solder Joints with Cu Substrate Pad Metallization

Journal of Electronic Materials (2008)

Yi‐Shao Lai Ying-Ta Chiu Jiunn Chen