Search results for: H.W. Chang

Items from 1 to 20 out of 120 results

article

Improved perpendicular magnetic properties of pulsed-dc-sputtered FePt thin films

C.Y. Shen, P.Y. Yeh, F.T. Yuan, H.W. Chang, more

Surface and Coatings Technology > 2018 > 350 > C > 795-800

Magnetic properties and microstructure of FePt thin films prepared by pulse dc sputtering on SiO₂/Si(100) substrates are studied. As comparing to the films prepared by conventional dc sputtering, FePt films fabricated by pulse dc sputtering show higher ordering parameter (S) of 0.6–0.8 at the post annealing temperature (T_a) in the range of 500–700 °C. In addition, a strong (00l) texture with Lotgering...

article

Exchange bias in Co/MnPt polycrystalline films on Si(100)/SiO2 substrates with Ta underlayer

H.W. Chang, C.Y. Shen, F.T. Yuan, P.H. Pan, more

Thin Solid Films > 2018 > 660 > C > 834-839

Structure and magnetic properties of sputter-prepared Co(5 nm)/MnPt bilayer films with Ta underlayer and various thicknesses of MnPt layer (t_MnPt) have been studied. Ta underlayer is effective in promoting the ordering of MnPt layer, flattening the surface and interface, and therefore leading to the improvement of the exchange bias field (H_E). Nevertheless, higher annealing temperature leads to the...

article

Significant coercivity enhancement of hot deformed NdFeB magnets by doping Ce-containing (PrNdCe)70Cu30 alloys powders

H.W. Chang, Y.I. Lee, P.H. Liao, W.C. Chang

Scripta Materialia > 2018 > 146 > C > 222-225

Coercivity enhancement of hot-deformed NdFeB magnets made from commercially available NdFeB powders doped with Ce-containing alloys is demonstrated. By doping (Pr₇₁Nd₂₇Ce₂)₇₀Cu₃₀ powders, where Pr₇₁Nd₂₇Ce₂ is a commercial mischmetal, the hot-deformed magnets exhibit significant enhancement of coercivity from 15.0kOe to 19.0kOe, and it can reach 20.1kOe by doping higher Ce-content (Pr₇₁Nd₉Ce₂₀)₇₀Cu...

article

Coercivity enhancement in hot deformed Nd2Fe14B-type magnets by doping low-melting RCu alloys (R=Nd, Dy, Nd+Dy)

Y.I. Lee, G.Y. Huang, C.W. Shih, W.C. Chang, more

Journal of Magnetism and Magnetic Materials > 2017 > 439 > C > 1-5

Magnetic properties of the anisotropic NdFeB magnets prepared by hot pressing followed by die-upsetting NdFeB MQU-F powders doped with low-melting RCu alloy powders were explored, where RCu stands for Nd₇₀Cu₃₀, Dy₇₀Cu₃₀ and (Nd_0.5Dy_0.5)₇₀Cu₃₀, respectively. In addition, the post-annealing at 600°C was employed to modify the microstructures and the magnetic properties of the hot deformed magnets. It...

article

Prediction of overall survival for patients with metastatic castration-resistant prostate cancer: development of a prognostic model through a crowdsourced challenge with open clinical trial data

Justin Guinney, Tao Wang, Teemu D Laajala, Kimberly Kanigel Winner, more

The Lancet Oncology > 2017 > 18 > 1 > 132-142

Improvements to prognostic models in metastatic castration-resistant prostate cancer have the potential to augment clinical trial design and guide treatment strategies. In partnership with Project Data Sphere, a not-for-profit initiative allowing data from cancer clinical trials to be shared broadly with researchers, we designed an open-data, crowdsourced, DREAM (Dialogue for Reverse Engineering Assessments...

article

Complete solutions at or near the boundary nodes of boundary elements for coupled stretching-bending analysis

H.W. Chang, Chyanbin Hwu

Engineering Analysis with Boundary Elements > 2016 > 72 > C > 89-99

In boundary element analysis if the field point is located at or near the boundary nodes, its associated integrals may become singular. Although in the literature the displacements and tractions at the boundary nodes have been well solved for the coupled stretching-bending analysis, their related strains and stresses still remain unsolved due to the coincidence of field points and boundary nodes....

article

Structure and magnetic properties of 300-nm-thick FePt films with Hf underlayer

C.Y. Shen, H.W. Chang, F.T. Yuan, C.C. Su, more

Journal of Physics and Chemistry of Solids > 2016 > 98 > C > 143-148

Structure, microstructure, magnetic properties of 300-nm-thick FePt films with 10-nm-thick Hf underlayer have been studied. The experimental results showed that the very thin Hf underlayer could promote the ordering at reduced temperatures by facilitating the nucleation of the order phase, leading to refined grain size and magnetic domain size. Therefore, the permanent magnetic properties of FePt...

article

Multiferroic properties of Bi1−xAxFeO3 polycrystalline films on glass substrates (A = Ca, Sr, Ba and x=0.05–0.15)

H.W. Chang, F.T. Yuan, K.T. Tu, S.Y. Lin, more

Journal of Alloys and Compounds > 2016 > 683 > C > 427-432

Bi_1−xA_xFeO₃ (BAFO) polycrystalline films (A = Ca, Sr, and Ba; x = 0.05, 0.1, and 0.15) were deposited on an optimized 20-nm-thick Pt bottom electrode on glass substrates at 450 °C via pulsed laser deposition. Perovskite single phase is confirmed in all studied BAFO films. With increasing content of the substituents, the refinement of microstructure and surface roughness becomes more obvious. Different...

article

Effect of Ta underlayer on magnetic properties of FeMn/NiFe films

H.W. Chang, F.T. Yuan, M.T. Chiang, M.C. Chan, more

Surface and Coatings Technology > 2016 > 303 > PA > 148-153

Effect of Ta underlayer on the magnetic properties of sputter-prepared NiFe(5nm)/FeMn(20nm) bilayer films have been studied. The magnetic properties of studied films are optimized by modification of working Ar pressure deposition of Ta (P_Ta) in the range of 2–12mTorr and thickness of Ta (t_Ta) in the range of 0–25nm. X-ray diffraction results show that the crystallinity of the FeMn(111) strongly depends...

article

Magnetic properties improvement of melt spun Co86.5Hf11.5B2 nanocomposites by refractory elements substitution

H.W. Chang, Y.H. Lin, C.W. Shih, M.C. Liao, more

Journal of Magnetism and Magnetic Materials > 2016 > 401 > C > 1139-1144

Magnetic properties of melt spun Co_86.5Hf_10.5MB₂ ribbons with refractory elements substitution (M=Cr, Nb, Ti, Zr) have been studied. For ternary Co_86.5Hf_11.5B₂ ribbon, permanent magnetic properties of B_r=0.71T, _iH_c=192kA/m, and (BH)_max=34.4kJ/m³ are obtained, and they are significantly improved to B_r=0.73–0.76T, _iH_c=136–216kA/m and (BH)_max=38.4–52.8kJ/m³ with M substitution. Summarized with the results...

article

(110)-Textured Ca-doped BiFeO3 film on refined Pt(111) electrode layer on glass substrate at reduced temperature

H.W. Chang, C.Y. Shen, F.T. Yuan, S.H. Tien, more

Journal of Magnetism and Magnetic Materials > 2016 > 401 > C > 673-676

Multiferroic and photovoltaic properties of polycrystalline Bi_0.85Ca_0.15FeO₃ (BCFO) film on refined Pt(111) electrode buffered glass substrate have been studied. Optimized Pt(111) electrode layer having large grain size and smooth morphology enables the development of highly (110)-textured BCFO film at a temperature as low as 450°C. The prepared BCFO film has dense microstructure, fine grain size,...

article

Singular integrals in boundary elements for coupled stretching–bending analysis of unsymmetric laminates

Chyanbin Hwu, H.W. Chang

Composite Structures > 2015 > 132 > Complete > 933-943

When an unsymmetric laminated plate is considered, the coupling of in-plane and plate bending problems is unavoidable. The boundary element for the coupled stretching–bending analysis was developed previously with suitable complex form fundamental solution. Usually, the singular integrals involved in the boundary element are treated by the conventional methods such as Gaussian quadrature rule for...

article

Multiferroic properties of (Bi, Ca)FeO3 films on glass substrates

H.W. Chang, C.Y. Shen, F.T. Yuan, K.T. Tu, more

Applied Surface Science > 2015 > 355 > C > 121-126

Effect of Ca substitution on the multiferroic properties of non-epitaxially grown polycrystalline Bi_1−xCa_xFeO₃ (BCFO) films on refined Pt(111) electrode buffered glass substrates is studied. The structural analysis shows that a pure perovskite phase with isotropic orientation is present for BCFO films (x=0.05–0.15). The grain size and surface roughness are reduced with increasing x. Different from...

article

Wheel speed-dependent martensitic transformation and magnetocaloric effect in Ni–Co–Mn–Sn ferromagnetic shape memory alloy ribbons

S.C. Ma, C.W. Shih, J. Liu, J.H. Yuan, more

Acta Materialia > 2015 > 90 > C > 292-302

This study investigated systematically the effects of different wheel speeds (10–30m/s) on the structural, microstructural, magnetic, and magnetocaloric properties of as-spun and annealed Ni–Co–Mn–Sn ribbons. The ribbons comprised a mixture of austenite with L2₁ cubic structure and non-modulated martensite with L1₀ tetragonal structure. Both as-spun and annealed ribbons showed an increase in the reverse...

article

Perpendicular magnetic anisotropy of non-epitaxial hexagonal Co50Pt50 thin films prepared at room temperature

F.T. Yuan, H.W. Chang, P.Y. Lee, C.Y. Chang, more

Journal of Alloys and Compounds > 2015 > 628 > Complete > 263-266

•In this paper, we propose a non-epitaxially grown PMA thin film of disorder hexagonal Co ₅₀ Pt ₅₀ which can satisfy all the requirements at once.•Although the preparation temperature is at room temperature and no post annealing is required, the film also shows good thermal stability up to 400°C.•Moreover, the easy-controlling single layer deposition process of the film largely enhances...

article

Magnetic property improvement of sputter-prepared FePd films on glass substrates with W underlayer

H.W. Chang, F.T. Yuan, W.C. Chen, D.H. Wei, more

Journal of Alloys and Compounds > 2015 > 622 > C > 1013-1017

Magnetic properties and structure of sputter-prepared FePd thin films on the glass substrates with W underlayer have been studied. The structural analysis shows that FePd films have a (111) preferred orientation. All studied FePd films exhibit in-plane magnetic anisotropy. In the single layer samples, the coercivity (H_c) and magnetic energy product ((BH)_max) are increased with T_a and reached the maximum...

article

Origins of the significant improvement in nanocrystalline Samarium–Cobalt’s magnetic properties when doping with Niobium

Tzu-Yuan Li, S.H. Chiou, H.W. Chang, S.C. Lo, more

Journal of Alloys and Compounds > 2015 > 622 > C > 262-268

SmCo₇-based compounds are prototypical rare-earth based hard magnetic materials that are the backbone of numerous devices and applications. We have found that by doping the SmCo₇ phase with Niobium (e.g. SmCo_6.7Nb_0.3), the enhanced coercivity being measured. Using a combination of microstructural and compositional characterization techniques with ab initio calculations, we find that the Nb-doping...

article

Coupled stretching–bending analysis of laminated plates with corners via boundary elements

Chyanbin Hwu, H.W. Chang

Composite Structures > 2015 > 120 > Complete > 300-314

To cover all the possibility of symmetric, anti-symmetric, or unsymmetric thin laminated plates, the fundamental solutions used in the present boundary element was obtained from the Green’s functions for the coupled stretching–bending analysis. Considering the possible existence of corners in thin laminated plates, four different approaches were proposed and compared to deal with the corners: (1)...

article

Energy product enhancement of FePt films by underlayering with Ti, Zr, and Hf

C.Y. Shen, H.W. Chang, F.T. Yuan, M.C. Lin, more

Applied Surface Science > 2014 > 313 > Complete > 755-761

Effect of M underlayer on the structure, microstructure, magnetic properties of FePt films have been studied (M=Ti, Zr, and Hf). The structural results confirm the extensive ordering of FePt in the bilayer films obtained with annealing at temperature 200°C lower than that at which the single layer film has similar ordering. Microstructure data indicate an obvious grain refinement in the bilayer films...

article

Electric-field effects on magnetic properties of molecular beam epitaxially grown thin (Ga,Mn)Sb layers

H.W. Chang, S. Akita, F. Matsukura, H. Ohno

Journal of Crystal Growth > 2014 > 401 > C > 633-635

We report molecular beam epitaxy of a ferromagnetic semiconductor (Ga,Mn)Sb, which is a single crystal without detectable second phases. We report also the details of magnetotransport properties of (Ga,Mn)Sb and the effects of electric fields on them. The difference between the properties observed here and properties of those reported earlier for a ferromagnetic semiconductor (Ga,Mn)As, provides information...

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MAGNETIC PROPERTIES (18)
MELT SPINNING (15)
FEPT (10)
NANOCOMPOSITES (10)
COERCIVITY (9)
EXCHANGE COUPLING (7)
PRFEB (6)
MAGNETIC THIN FILMS (5)
NANOCOMPOSITE (5)
ENERGY PRODUCT (4)
EXCHANGE-COUPLING (4)
FEPTB (4)
GLASS SUBSTRATE (4)
MAGNETIC PROPERTY (4)
MICROSTRUCTURE (4)
PERMANENT MAGNETS (4)
PLATINUM ALLOYS (4)
SURFACE MAGNETO-OPTIC KERR EFFECT (4)
ANNEALING (3)
COBALT (3)
COERCIVE FORCE (3)
COERCIVITY ENHANCEMENT (3)
CONDUCTANCE (3)
DOMAIN STRUCTURE (3)
ELECTRON BEAM LITHOGRAPHY (3)
EXCHANGE BIAS (3)
GRAIN REFINEMENT (3)
IRON ALLOYS (3)
MAGNETIC FILMS (3)
MAGNETISATION REVERSAL (3)
METAL (3)
NANOROD (3)
OXYGEN EXPOSURE (3)
PERMANENT MAGNET (3)
PHASE EVOLUTION (3)
PHOTOLUMINESCENCE (3)
PT(111) UNDERLAYER (3)
RARE EARTH MAGNETS (3)
SINGULAR INTEGRAL (3)
SPUTTERING (3)
THIN FILMS (3)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 75.50.KJ (3)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 75.50.WW (3)
BOUNDARY ELEMENT (2)
BULK MAGNETS (2)
CAST MAGNETS (2)
COPPER MOLD CASTING (2)
COUPLED STRETCHING–BENDING ANALYSIS (2)
D. MAGNETIC PROPERTIES (2)
FEPT FILMS (2)
GLASS (2)
GRAIN SIZE (2)
INTERMETALLICS (2)
MAGNETIC DOMAINS (2)
MAGNETIC MULTILAYERS (2)
MAGNETIC TRANSITIONS (2)
MAGNETIZATION REVERSAL (2)
MAGNETRON SPUTTERING (2)
METALLIC THIN FILMS (2)
METASTABLE PHASE (2)
MOSSBAUER (2)
MULTILAYERS (2)
NANOCOMPOSITE RIBBONS (2)
PERPENDICULAR MAGNETIC ANISOTROPY (2)
PRFEB NANOCOMPOSITES (2)
SPUTTER DEPOSITION (2)
ULTRATHIN FILMS (2)
YFEB (2)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 75.20.EN (2)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 75.50.BB (2)
PR 2 FE 1 4 (C,B)/Α-FE (1)
PR 2 FE 1 4 C/Α-FE (1)
PR Y FE 9 0 - Y B 1 0 (1)
(001) TEXTURE (1)
(110)-TEXTURED (BI, CA)FEO3 POLYCRYSTALLINE FILM (1)
(FEPT)₇₇AG₂₃ (1)
(FEPT)₇₇AG₂₃ ALLOY THIN FILMS (1)
200 TO 400 DEGC (1)
600 DEGC (1)
700 DEGC (1)
A. INTERMETALLICS (1)
A3. MOLECULAR BEAM EPITAXY (1)
ALKALINE EARTH ELEMENT DOPED BIFEO3 POLYCRYSTALLINE FILMS (1)
AMORPHOUS (1)
AMORPHOUS LAYERS (1)
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ANGULAR DEPENDENT COERCIVITY (1)
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ANTIREFLECTION COATING (1)
ATOMIC DATA (1)
AUGER ELECTRON SPECTROSCOPY (1)
AUXILIARY EQUATION (1)
B. MELT SPINNING (1)
B1. ANTIMONIDES (1)
B2. MAGNETIC MATERIALS (1)
B2. SEMICONDUCTING III–V MATERIALS (1)
B3. FIELD EFFECT TRANSISTORS (1)
BIAXIAL TENSILE STRESS (1)
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INFONA - science communication portal

Search results for: H.W. Chang

Improved perpendicular magnetic properties of pulsed-dc-sputtered FePt thin films

Exchange bias in Co/MnPt polycrystalline films on Si(100)/SiO2 substrates with Ta underlayer

Significant coercivity enhancement of hot deformed NdFeB magnets by doping Ce-containing (PrNdCe)70Cu30 alloys powders

Coercivity enhancement in hot deformed Nd2Fe14B-type magnets by doping low-melting RCu alloys (R=Nd, Dy, Nd+Dy)

Prediction of overall survival for patients with metastatic castration-resistant prostate cancer: development of a prognostic model through a crowdsourced challenge with open clinical trial data

Complete solutions at or near the boundary nodes of boundary elements for coupled stretching-bending analysis

Structure and magnetic properties of 300-nm-thick FePt films with Hf underlayer

Multiferroic properties of Bi1−xAxFeO3 polycrystalline films on glass substrates (A = Ca, Sr, Ba and x=0.05–0.15)

Effect of Ta underlayer on magnetic properties of FeMn/NiFe films

Magnetic properties improvement of melt spun Co86.5Hf11.5B2 nanocomposites by refractory elements substitution

(110)-Textured Ca-doped BiFeO3 film on refined Pt(111) electrode layer on glass substrate at reduced temperature

Singular integrals in boundary elements for coupled stretching–bending analysis of unsymmetric laminates

Multiferroic properties of (Bi, Ca)FeO3 films on glass substrates

Wheel speed-dependent martensitic transformation and magnetocaloric effect in Ni–Co–Mn–Sn ferromagnetic shape memory alloy ribbons

Perpendicular magnetic anisotropy of non-epitaxial hexagonal Co50Pt50 thin films prepared at room temperature

Magnetic property improvement of sputter-prepared FePd films on glass substrates with W underlayer

Origins of the significant improvement in nanocrystalline Samarium–Cobalt’s magnetic properties when doping with Niobium

Coupled stretching–bending analysis of laminated plates with corners via boundary elements

Energy product enhancement of FePt films by underlayering with Ti, Zr, and Hf

Electric-field effects on magnetic properties of molecular beam epitaxially grown thin (Ga,Mn)Sb layers

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