Index Catalog // MDR

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

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

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

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

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

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

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

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

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

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

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

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

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

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

631% room temperature tunnel magnetoresistance with large oscillation effect in CoFe/MgO/CoFe(001) junctions

Description/Abstract:: We demonstrate tunnel magnetoresistance (TMR) ratios of up to 631% at room temperature (RT) using CoFe/MgO/CoFe(001) epitaxial magnetic t...
Keyword:: MgO, TMR, epitaxial growth, magnetic tunnel junctions, spintronics, and tunnel magnetoresistance
Resource Type:: Article
Author:: Thomas Scheike, Zhenchao Wen, Hiroaki Sukegawa, and Seiji Mitani
Journal:: APPLIED PHYSICS LETTERS
Date Uploaded:: 05/01/2024

Observation of charge-to-spin conversion with giant efficiency at Ni0.8Fe0.2/Bi2WO6 interface

Description/Abstract:: 酸化物強誘電体Bi2WO6を用いて、Py/Bi2WO6ヘテロ構造を作製し、界面における電荷-スピン変換効率を計測した。その結果、非常に高い変換効率を示した。これは、BiやWの強いスピン軌道相互作用に起因すると予想される。
Keyword:: charge-to-spin current conversion
Resource Type:: Article
Author:: Saikat Das, Satoshi Sugimoto, Varun Kumar Kushwaha, Yusuke Kozuka, and Shinya Kasai
Journal:: APL Materials
Date Uploaded:: 02/12/2023
Date Modified:: 03/12/2023

Fast electron damage mechanism of epoxy resin studied by electron energy loss spectroscopy and electron diffraction

Description/Abstract:: The damage mechanism and exposure tolerance of epoxy resins to fast electrons remain unclear. We quantitatively investigated the effec...
Keyword:: electron energy loss spectroscopy, epoxy resin, fast electron damage, and π electron
Resource Type:: Article
Author:: Jun Kikkawa, Aoi Nii, Yoshiaki Sakaniwa, Naochika Kon, Marina Sakamaki, Touyou Ohashi, Nobuyasu Nita, Koji Harano, and Koji Kimoto
Journal:: JOURNAL OF CHEMICAL PHYSICS
Date Uploaded:: 01/12/2023
Date Modified:: 01/12/2023

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:: 21/11/2023
Date Modified:: 27/11/2023

Atomic resolution analysis of extended defects and Mg agglomeration in Mg-ion-implanted GaN and their impacts on acceptor formation

Description/Abstract:: We used atomic-scale direct observations by transmission electron microscopy (TEM) and atom probe tomography to clarify the crystallograp...
Keyword:: atom probe tomography, gallium nitride, and transmission electron microscopy
Resource Type:: Article
Author:: Emi Kano, Keita Kataoka, Jun Uzuhashi, Kenta Chokawa, Hideki Sakurai, Akira Uedono, Tetsuo Narita, Kacper Sierakowski, Michal Bockowski, Ritsuo Otsuki, Koki Kobayashi, Yuta Itoh, Masahiro Nagao, Tadakatsu Ohkubo, Kazuhiro Hono, Jun Suda, Tetsu Kachi, and Nobuyuki Ikarashi
Journal:: JOURNAL OF APPLIED PHYSICS
Date Uploaded:: 28/09/2023
Date Modified:: 28/09/2023

Acceptor activation of Mg-doped GaN—Effects of N2/O2 vs N2 as ambient gas during annealing

Description/Abstract:: Here, we investigate the effects of O2:N2 (1:1) as ambient gas as compared with pure N2 during activation annealing of Mg as p-type dopin...
Keyword:: activation, gallium nitride, scanning transmission electron microscopy, and semiconductor
Resource Type:: Article
Author:: Ashutosh Kumar, Martin Berg, Qin Wang, Jun Uzuhashi, Tadakatsu Ohkubo, Michael Salter, and Peter Ramvall
Journal:: JOURNAL OF APPLIED PHYSICS
Date Uploaded:: 28/09/2023
Date Modified:: 28/09/2023

Sorption-induced static mode nanomechanical sensing with viscoelastic receptor layers for multistep injection-purge cycles

Description/Abstract:: Nanomechanical sensors and their arrays have been attracting significant attention for detecting, distinguishing, and identifying target ...
Keyword:: nanomechanical sensors and sorption kinetics
Resource Type:: Article
Author:: Kosuke Minami, Kota Shiba, and Genki Yoshikawa
Journal:: JOURNAL OF APPLIED PHYSICS
Date Uploaded:: 25/07/2023

Atomic-scale investigation of implanted Mg in GaN through ultra-high-pressure annealing

Description/Abstract:: An area selective doping via ion implantation is a key technology to realize gallium nitride (GaN) based energy-efficient power devices; ...
Keyword:: atom probe tomography, cathodoluminescence, gallium nitride, implantation, and scanning transmission electron microscopy
Resource Type:: Article
Author:: Jun Uzuhashi, Jun Chen, Ashutosh Kumar, Wei Yi, Tadakatsu Ohkubo, Ryo Tanaka, Shinya Takashima, Masaharu Edo, Kacper Sierakowski, Michal Bockowski, Hideki Sakurai, Tetsu Kachi, Takashi Sekiguchi, and Kazuhiro Hono
Journal:: JOURNAL OF APPLIED PHYSICS
Date Uploaded:: 04/07/2023

Evaluation of dielectric function models for calculation of electron inelastic mean free path

Description/Abstract:: This work investigates the detailed difference between dielectric function models, the Mermin model and the full Penn algorithm (FPA) mod...
Keyword:: Mermin model, electron inelastic mean free path, and plasmon lifetime
Resource Type:: Article
Author:: B. Da, X. Liu, L. H. Yang, J. M. Gong, Z. J. Ding, H. Shinotsuka, J. W. Liu, H. Yoshikawa, and S. Tanuma
Date Uploaded:: 11/04/2023

Thermal stability investigation for Ohmic contact properties of Pt, Au, and Pd electrodes on the same hydrogen-terminated diamond

Description/Abstract:: Here, thermal stabilities for Ohmic contact properties of Pt, Au, and Pd on the same hydrogen-terminated diamond (H-diamond) epitaxial la...
Keyword:: thermal stabilities for Ohmic contact properties
Resource Type:: Article
Author:: Xiaolu Yuan, Jiangwei Liu, Siwu Shao, Jinlong Liu, Junjun Wei, Bo Da, Chengming Li, and Yasuo Koide
Date Uploaded:: 28/02/2023

Combination of recommender system and single-particle diagnosis for accelerated discovery of novel nitrides

Description/Abstract:: Discovery of new compounds from wide chemical space is attractive for materials researchers. However, theoretical prediction and validati...
Keyword:: materials search, materials informatics, and density functional theory calculation
Material/Specimen:: nitrides
Resource Type:: Article
Author:: KOYAMA, Yukinori, SEKO, Atsuto, TANAKA, Isao, FUNAHASHI, Shiro, and HIROSAKI, Naoto
Journal:: The Journal of Chemical Physics
Date Uploaded:: 15/06/2021
Date Modified:: 24/06/2022

Coalescence delay of microbubbles on superhydrophobic/superhydrophilic surfaces underwater

Description/Abstract:: Inspired by penguins, the formation of an air film on surfaces underwater has been well-researched for the potential reduction of drag. H...
Keyword:: microbubble, superhydrophilic, and superhydrophobic
Resource Type:: Article
Author:: Kawase, Yudai, Doi, Kotaro, Naito, Masanobu, Ng, Chen Xian, and Tenjimbayashi, Mizuki
Journal:: Applied Physics Letters
Date Uploaded:: 02/01/2021
Date Modified:: 18/10/2022

Structure prediction of boron-doped graphene by machine learning

Description/Abstract:: Heteroatom doping has endowed graphene with manifold aspects of material properties and boosted its applications. The atomic structure de...
Keyword:: Materials design and Monte Carlo tree search
Resource Type:: Article
Author:: Hou, Zhufeng, Tsuda, Koji, and Dieb, Thaer M.
Journal:: The Journal of Chemical Physics
Date Uploaded:: 02/10/2020
Date Modified:: 16/10/2020

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