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1.
Plasma-free dry etching of (001) β-Ga2O3 substrates by HCl gas
Description/Abstract:
In this study, we dry etched SiO2-masked (001) b-Ga2O3 substrates in HCl gas flow at a high temperature without plasma excitation. The et...
Keyword:
Ga2O3
,
HCl
, and
etching
Resource Type:
Article
Author:
Takayoshi Oshima
and
Yuichi Oshima
Journal:
APPLIED PHYSICS LETTERS
Date Uploaded:
28/05/2024
2.
Near-infrared imaging of heat transfer behavior between gadolinium and fluid during magnetization/demagnetization process of magnetocaloric effect
Description/Abstract:
This paper reports on the application of a near-infrared (NIR) imaging system for visualizing heat transfer dynamics from a bulk gadolini...
Keyword:
Magnetocaloric effect
and
Near-infrared imaging
Resource Type:
Article
Author:
The-Anh Nguyen
,
Naoto Kakuta
,
Ken-ichi Uchida
, and
Hosei Nagano
Journal:
Journal of Applied Physics
Date Uploaded:
27/05/2024
3.
Designing composition ratio of magnetic alloy multilayer for transverse thermoelectric conversion by Bayesian optimization
Description/Abstract:
Wedemonstrated the effectiveness of the machine learning method combined with first-principles calculations for the enhancement of the an...
Keyword:
Spin-orbit interactions, First-principle calculations, Superlattices, Informatics, Machine learning, Ferromagnetic materials, Multilayers, Thermoelectric effects
Resource Type:
Article
Author:
Naoki Chiba
,
Keisuke Masuda
,
Ken-ichi Uchida
, and
Yoshio Miura
Journal:
APL Machine Learning
Date Uploaded:
24/05/2024
4.
Zero-magnetic-field operation of ordinary-Nernst-effect-based transverse thermoelectric module using embedded permanent magnets
Description/Abstract:
The ordinary Nernst effect enables large transverse thermoelectric conversion in semimetals but its operation requires the application of...
Keyword:
ordinary Nernst effect
,
permanent magnet
, and
transverse thermoelectric conversion
Resource Type:
Article
Author:
Masayuki Murata
,
Takamasa Hirai
,
Takeshi Seki
, and
Ken-ichi Uchida
Journal:
APPLIED PHYSICS LETTERS
Date Uploaded:
15/05/2024
5.
Enhanced orbital torque efficiency in nonequilibrium Ru50Mo50(0001) alloy epitaxial thin films
Description/Abstract:
Epitaxial thin films of fully nonequilibrium hcp-Ru_50Mo_50(0001) nanoalloys were prepared as a chemically disordered alloy, in which the...
Keyword:
Epitaxial thin films
,
Nonequilibrium
,
Orbital torque
, and
Ru50Mo50(0001)
Resource Type:
Article
Author:
Ke Tang
,
Cong He
,
Zhenchao Wen
,
Hiroaki Sukegawa
,
Tadakatsu Ohkubo
,
Yukio Nozaki
, and
Seiji Mitani
Journal:
APL Materials
Date Uploaded:
13/05/2024
6.
Study of device characteristics of intrinsic Josephson junction terahertz emitters related to annealing conditions of the crystals
Description/Abstract:
We fabricated terahertz (THz) wave emitters from high-temperature superconductor Bi2 Sr2 CaCu2 O8þδ (Bi2212) single crystals annealed und...
Keyword:
Josephson junction
,
annealing condition
,
high-temperature superconductor
, and
terahertz emitter
Resource Type:
Article
Author:
S. Nakagawa
,
T. Shizu
,
T. Imai
,
M. Nakayama
,
J. Kim
,
H. Minami
,
K. Kadowaki
,
M. Tsujimoto
,
H. Nakao
,
H. Eisaki
,
S. Ishida
,
T. Mochiku
,
Y. Hasegawa
, and
T. Kashiwagi
Journal:
JOURNAL OF APPLIED PHYSICS
Date Uploaded:
26/04/2024
7.
Optimum asymmetry for nanofabricated refractometric sensors at quasi-bound states in the continuum
Description/Abstract:
A symmetry-protected bound state in the continuum (BIC) is one of the bases for high-resolution photonic refractometric sensors that rely...
Keyword:
BIC
,
biosensors
,
bound states in the continuum
, and
metasurfaces
Resource Type:
Article
Author:
Keisuke Watanabe
and
Masanobu Iwanaga
Journal:
Applied Physics Letters
Date Uploaded:
03/04/2024
8.
Local defect and mid-gap state analysis of GaN using monochromated EELS combined with nanodiffraction and atomic-resolution imaging
Description/Abstract:
Enhancement of energy resolution due to evolution of monochromators has made electron energy loss spectroscopy (EELS) in transmission ele...
Keyword:
4D-STEM
,
ABF-STEM
,
EELS
,
GaN
,
HAADF-STEM
,
HAXPES
, and
defect
Resource Type:
Article
Author:
Shunsuke Yamashita
,
Sei Fukushima
,
Jun Kikkawa
,
Ryoji Arai
,
Yuya Kanitani
,
Koji Kimoto
, and
Yoshihiro Kudo
Journal:
APL Materials
Date Uploaded:
19/03/2024
9.
Atomic position and the chemical state of an active Sn dopant for Sn-doped β-Ga2O3(001)
Description/Abstract:
Snドープ β-Ga2O3(001)のドーパントの原子位置を光電子ホログラフィ法により明らかにした。
Keyword:
Ga2O3
,
b-Ga2O3
, and
dopant
Resource Type:
Article
Author:
Yuhua Tsai
,
Masaaki Kobata
,
Tatsuo Fukuda
,
Hajime Tanida
,
Toru Kobayashi
, and
Yoshiyuki Yamashita
Journal:
Applied Physics Letters
Date Uploaded:
19/03/2024
10.
Perspective on nanoscale magnetic sensors using giant anomalous Hall effect in topological magnetic materials for read head application in magnetic recording
Description/Abstract:
Recent advances in the study of materials with topological electronic band structures have revealed magnetic materials exhibiting giant a...
Keyword:
Weyl semimetal
,
anomalous Hall effect
,
magnetic recording
,
magnetic sensors
,
read head
, and
topological materials
Resource Type:
Article
Author:
Tomoya Nakatani
,
Prabhanjan D. Kulkarni
,
Hirofumi Suto
,
Keisuke Masuda
,
Hitoshi Iwasaki
, and
Yuya Sakuraba
Journal:
Applied Physics Letters
Date Uploaded:
26/02/2024
11.
Epitaxial lateral overgrowth of r-plane α-Ga2O3 with stripe masks along <-12-10>
Description/Abstract:
We demonstrated the epitaxial lateral overgrowth of (-1012) (r-plane) α-Ga2O3 using striped mask pattern along <-12-10>. α-Ga2O3 st...
Keyword:
ELO
,
HVPE
,
dislocation
, and
α-Ga2O3
Resource Type:
Article
Author:
Yuichi Oshima
,
Shingo Yagyu
, and
Takashi Shinohe
Journal:
JOURNAL OF APPLIED PHYSICS
Date Uploaded:
30/01/2024
Date Modified:
01/02/2024
12.
Epitaxial growth of phase-pure e-Ga2O3 by halide vapor phase epitaxy
Description/Abstract:
The halide vapor phase epitaxy of e-Ga2O3 is demonstrated for the first time. The e-Ga2O3 films are grown on GaN (0001), AlN (0001), and ...
Keyword:
HVPE
,
ε-Ga2O3
, and
κ-Ga2O3
Resource Type:
Article
Author:
Yuichi Oshima
,
Encarnación G. Víllora
,
Yoshitaka Matsushita
,
Satoshi Yamamoto
, and
Kiyoshi Shimamura
Journal:
JOURNAL OF APPLIED PHYSICS
Date Uploaded:
30/01/2024
Date Modified:
01/02/2024
13.
Hydride Vapor Phase Epitaxy and characterization of High-Quality ScN epilayers
Description/Abstract:
ScClxとNH3との反応によるHVPEでScNを育成した。成長速度は、原料分圧の増大に伴って最初は増加するが、やがて減少に転じ、最大成長速度は5um/h程度であった。基板は種々試みたが、サファイア(10-12)と(10-10)を用いたときに単一配向のScN(100)および...
Keyword:
HVPE
and
ScN
Resource Type:
Article
Author:
Yuichi Oshima
,
Encarnación G. Víllora
, and
Kiyoshi Shimamura
Journal:
JOURNAL OF APPLIED PHYSICS
Date Uploaded:
30/01/2024
Date Modified:
01/02/2024
14.
Epitaxial lateral overgrowth of α-Ga2O3 by halide vapor phase epitaxy
Description/Abstract:
We demonstrated epitaxial lateral overgrowth of a-Ga2O3 by halide vapor phase epitaxy. We formed stripe patterned or triangular lattice d...
Keyword:
ELO
,
HVPE
,
dislocation
, and
α-Ga2O3
Resource Type:
Article
Author:
Y. Oshima
,
K. Kawara
,
T. Shinohe
,
T. Hitora
,
M. Kasu
, and
S. Fujita
Journal:
APL MATERIALS
Date Uploaded:
29/01/2024
Date Modified:
01/02/2024
15.
Progress and challenges in the development of ultra-wide bandgap semiconductor α-Ga2O3 toward realizing power device applications
Description/Abstract:
パワー、およびUV応用を指向したα型酸化ガリウムの関連技術の現状と技術課題を俯瞰し、今後の展望を述べる。
Keyword:
epitaxy
,
power device
, and
α-Ga2O3
Resource Type:
Article
Author:
Yuichi Oshima
and
Elaheh Ahmadi
Journal:
APPLIED PHYSICS LETTERS
Date Uploaded:
29/01/2024
Date Modified:
01/02/2024
16.
Materials issues and devices of α- and β-Ga2O3
Description/Abstract:
パワーデバイスに向けたα- および β- Ga2O3の材料およびデバイス開発の最新状況を概観する。
Keyword:
Ga2O3
,
epitaxy
, and
power device
Resource Type:
Article
Author:
Elaheh Ahmadi
and
Yuichi Oshima
Journal:
JOURNAL OF APPLIED PHYSICS
Date Uploaded:
29/01/2024
Date Modified:
01/02/2024
17.
Permanent-magnet-based transverse thermoelectric generator with high fill factor driven by anomalous Nernst effect
Description/Abstract:
A transverse thermoelectric generator for magnetic-field-free and high-density power generation utilizing the anomalous Nernst effect is ...
Keyword:
Energy harvesting
,
Infrared imaging
,
Magnetic materials
,
Thermoelectric effects
, and
Thermoelectric generator
Resource Type:
Article
Author:
Fuyuki Ando
,
Takamasa Hirai
, and
Ken-ichi Uchida
Journal:
APL Energy
Date Uploaded:
26/01/2024
18.
Improvement of magnetic field detectivity in electrical 1/f noise-dominated tunnel magnetoresistive sensors by AC magnetic field modulation technique
Description/Abstract:
Suppression of 1/f noise in tunnel magnetoresistance (TMR) sensors is a central issue in the realization of magnetic field sensors with u...
Keyword:
1/f noise
,
magnetic sensor
,
noise
, and
tunnel magnetoresistance
Resource Type:
Article
Author:
Tomoya Nakatani
,
Hirofumi Suto
,
Prabhanjan D. Kulkarni
,
Hitoshi Iwasaki
, and
Yuya Sakuraba
Journal:
JOURNAL OF APPLIED PHYSICS
Date Uploaded:
23/01/2024
Date Modified:
16/02/2024
19.
Gate-modulated reflectance spectroscopy for detecting excitonic states in two-dimensional semiconductors
Description/Abstract:
We have developed a microspectroscopy technique for measuring gate-modulated reflectance to probe excitonic states in two-dimensional tra...
Keyword:
2D materials
,
excitons
, and
modulation spectroscopy
Resource Type:
Article
Author:
Mengsong Xue
,
Kenji Watanabe
,
Takashi Taniguchi
, and
Ryo Kitaura
Journal:
APPLIED PHYSICS LETTERS
Date Uploaded:
12/01/2024
Date Modified:
15/01/2024
20.
Large voltage-controlled magnetic anisotropy effect in magnetic tunnel junctions prepared by deposition at cryogenic temperatures
Description/Abstract:
We investigated the influence of the buffer material and a cryogenic temperature deposition process on the voltage-controlled magnetic an...
Keyword:
Spintronics
Resource Type:
Article
Author:
Takayuki Nozaki
,
Tomohiro Ichinose
,
Jun Uzuhashi
,
Tatsuya Yamamoto
,
Makoto Konoto
,
Kay Yakushiji
,
Tadakatsu Ohkubo
, and
Shinji Yuasa
Journal:
APL Materials
Date Uploaded:
10/01/2024
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6
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5
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4
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4
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3
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