We measured optical properties, such as photoluminescence and electroluminescence, of p-n heterostructure consisting of GaN grown on Si substrate, under a collaborative help of Prof.Akiyama and Dr.Kim and Mr.Nakamae in ISSP, Univ. of Tokyo. We found a significant emission peak located at higher energy than normal GaN bandbap transition, which we expect from the distorted cystal lattice of GaN with columuner shapes.
(Experimetal equipments of PL measurement operated by Mori(rightside person) and Takemura(leftside).)

Kuwano, Kubota, Miwa and Horiuchi have come to our lab as Undergraduate members. Welcome to Miyagawa Lab!

We attended the 82th fall meeting of the Japan Society of Applied Physics(JSAP), which was held at Full-Online organized by Meijo University

• 'Electrical and optical properties of pn-junction of GaN grown on Si(001) substrate' presented by T.Mori
• 'LPCVD SiN Film Breakdown and N2-anneal Temperature (I): TDDB and ESR Evaluations' presented by H.Kurita(*)
• 'LPCVD SiN Film Breakdown and N2-anneal Temperature (II): ESR and FTIR Evaluations' presented by H.Miyagawa

(*) H.Kurita's affiliation: ROHM Hamamatsu.

We attended Semiconductor Workshop for Young Scientists in Chugoku-Shikoku region sponsored by Chugoku-Shikoku Branch of the Japan Society of Applied Physics(JSAP), at Online organized by Yamaguchi University.

• 'Pattern shape dependence in ferromagnetic in Fe embedded structure in GaAs' presented by H.Kojo
• 'Evaluation of N2 annealing temperature dependence of SiN film by ESR and FTIR' presented by K.Bunya

We attended the joint conference of the Chugoku-Shikoku Branch of both the Physical Society of Japan(PSJ), the Japan Society of Applied Physics(JSAP), The Physics Education Society of Japan(PESJ) and Optical Society of Japan(OSJ), which was held at Online. (organized by Yamaguchi Univ.)

• 'Rietveld Analysis of Eu-doped Phosphor Sr3MgSi2O8:Eu2+ under pseudo-regular tetrahedral constraint on Si-O bonds' presented by K.Matsumoto
• 'Fabrication of magnetic Py/Fe bilayer line structure and Current and magnetic field dependence of magnetic structure' presented by T.Takemura

Prof. Su and the graduate student Mr. Jhang has visited Kagawa University and done some experiments of sampe fabrication and characterization of magnetism.


(This photo was taken in front of AFM system, but unfortunately, it's out of order now. We have to amend it soon...)

We attended Semiconductor Workshop for Young Scientists in Chugoku-Shikoku region sponsored by Chugoku-Shikoku Branch of both the Physical Society of Japan(PSJ) and the Japan Society of Applied Physics(JSAP), at Saijo Seminar House in Hiroshima.

• 'Optical and electrical properties of diluted magnetic semiconductor superlattice GaGdAs:Si/GaAs depending on Gd concentration' presented by H.Yoshida

We attended the joint conference of the Chugoku-Shikoku Branch of both the Physical Society of Japan(PSJ) and the Japan Society of Applied Physics(JSAP), which was held at Hiroshima Univ.

• 'State of coordination around Eu by blue phosphor Sr3MgSi2O8:Eu2+ by means of Rietveld analysis' presented by A.Ono
• 'Observation of domain movement in transition metal magnetic multilayer single line' presented by M.Tomokawa
• 'Magnetic moment behavior around interface in Fe/Py magnetic multilayer film' presented by K.Yoshii

We attended the Annual meeting of the Asia Pacific Society for Materials Research(APSMR), which was held at Sapporo Convention center.(www.apsmr.org)

• 'Carrier-doping effect on structure and physical properties of III-V based diluted magnetic semiconductor GaGdAs superlattice' presented by H.Miyagawa
• 'Fabrication of spin-polarized light-emitting diodes using diluted magnetic semiconductor' presented by S.Kato
• 'Fabrication of transition metal line of Py/Cu/Fe magnetic multilayer for current induced domain wall motion' presented by T.Nakamura

Jerome FAGET, and Marc BOUTEILER have come in our labo from Mines Albe (www.mines-albi.fr), France. They joined our projects of magnetic semiconductor, and metal films. We hope to get fruitful results.

As master first grade, Onishi have presented and been audited in Opto-Electronics Materials Science group, and have passed with no problem. Congratulations! and Merry christmas!

Akaishi, Sakuramata, and Yamawaki have come to our lab as Undergraduate members. Welcome to Miyagawa Lab!

We held the 3rd Joint Workshop of Advanced Materials Science and Engineering between Kagawa University and Hanbat National University. Matsumoto and Takemasa presented their poster at the lunch session. At the banquet, teachers and students from both universities enjoyed foods, drinks and the conversations.



I and Hanbat teachers and students visited two companies in Kagawa. One is ISHIGAKI, which makes filter-presses or water pumps in Sakaide, and another is TADANO, which mainly makes car-cranes in Shido. We enjoyed looking around the making process of heavy machines. I would appreciate both company's persons so much. It is so important for people of both nations to contact and understand each other.

As master first grade, Takemasa and Yamano have presented and been audited in Opto-Electronics Materials Science group. They both have passed with no problem. Congratulations! and Merry christmas!

We attended the 23st Academic Symposium of MRS-Japan, which was held at Yokohama Media & Communication Center. Homepage is here.

• 'Effects of Si doping on Electrical and Optical Properties of Diluted Magnetic Semiconductor GaGdAs' by S.Matsumoto
• 'Structure and Magnetic Properties of Diluted Magnetic Semiconductor Superlattice GaGdAs/GaAs Grown by MBE' by N.Funaki

Gotsu, Sano, Harada, and Yukihiro have come to our lab as Undergraduate members. Welcome to Miyagawa Lab!

We attended the Solid State Devices and Materials Conference, SSDM2013, which was held at Hilton Fukuoka Seahawk in Fukuoka. Homepage is here.

• 'Structure and Magnetic Properties of Diluted Magnetic Semiconductor Superlattice GaGdAs/GaAs Grown by MBE' presented by N.Funaki

We attended the 74th fall meeting of the Japan Society of Applied Physics(JSAP), which was held at Kyoutanabe campus, Doshisha univ.

• 'Effects of Si doping on Electrical and Optical Properties of Diluted Magnetic Semiconductor GaGdAs' presented by S.Matsumoto
• 'Gd sublattice Magnetization in Diluted Magnetic Semiconductor GaGdAs measured by X-ray Magnetic Circular Dichroism ' presented by N.Funaki

Students in Bachelar course and Master course presented their intemidiate progress and were inspected.
N.Funaki and S.Matsumoto in Master course have passed the scrutiny without problems.

We held Semiconductor Workshop for Young Scientists in Chugoku-Shikoku region sponsored by Chugoku-Shikoku Branch of both the Physical Society of Japan(PSJ) and the Japan Society of Applied Physics(JSAP), at Ohkura Hotel and Manabi-Can hall in Takamatsu. We had discussed recent developments and future perspectives in the semiconductor technology through two days and one night with drinks and foods. Thanks a lot to attendances and organizers.

• 'PL and absorption spectrum and electrical properties of DMS GaGdAs' presented by S.Matsumoto

We held the joint conference of the Chugoku-Shikoku Branch of both the Physical Society of Japan(PSJ) and the Japan Society of Applied Physics(JSAP), at Hayashi Campus of Kagawa Univ.

• 'Gd sublattice Magnetization in Diluted Magnetic Semiconductor GaGdAs measured by X-ray Magnetic Circular Dichroism' presented by N.Funaki
• 'The surface magnetism by magneto-optical Kerr effect of Fe / Gd multilayer films' presented by H.Takemasa
• 'Fabrication and Evaluation of electric property of Si doped GaGdAs magnetic thin film' presented by T.Onishi

Bachelars and Masters, who got the degrees, held the Graduation Party, and showed appriciations to advisers and all faculty members. We celebrarted with good foods and drinks, and Karaoke! Mr. Yamano in our group won the performance award for good presentation. Congratulations!

Students in Bachelar course and Master course presented their theses and were inspected.
Uda in Master course, and Takemasa, Tsutsumi, Yamano, Yamashita in Bachelor course, have passed the scrutiny without problems. They are to be complete their cources with some modification of the theses.

We held the 2nd Joint Workshop of Advanced Materials Science and Engineering between Kagawa University and Hanbat National University. At the banquet, teachers and students from both universities enjoyed foods, drinks and the conversations.

As master first grade, Matsumoto and Funaki have presented and been audited in Opto-Electronics Materials Science group.

Onishi, Kikuta, Sone, and Takagi have come to our lab as Undergraduate members. Welcome to Miyagawa Lab!

We performed MCD(Magnetic Circular Dichroism) experiments using hard x-ray of synchrotron radiation in SPring-8, Hyogo, with intensive help of Dr.Kawamura, Dr.Mizumaki, and Dr.Suzuki at BL-39XU. We detected the MCD signal in Gd L3-edge, which means that the macro magnetization of GaGdAs is attribute to Gd moment.


   

We attended the International Conference on Molecular Beam Epitaxy 2012 (MBE2012), which was held at Nara. Homepage is here. A valuable talk of Prof. Sakaki and others which focused on MBE growth were presented. A lot of deer are playing in the park of the venue.

• 'Photoelectron spectroscopy of diluted magnetic semiconductor GaGdAs grown by MBE' presented by N.Funaki
• 'Electrical and optical properties of diluted magnetic semiconductor GaGdAs/GaAs' presented by S.Matsumoto

We attended the 73th fall meeting of the Japan Society of Applied Physics(JSAP), which was held at Ehime univ. and Matsuyama univ.

• 'Electronic state properties of diluted magnetic semiconductor GaGdAs by means of Photoelectron Spectroscopy' presented by N.Funaki

We measured optical properties of photoluminescense and absorption of diluted magnetic semiconductor GaGdAs monolayer, under a collaborative help of Prof.Akiyama and Dr.Mochizuki in ISSP, Univ. of Tokyo. We found GaGdAs has a slightly different shape of absorption spectrum form that of GaAs. More data is needed to clarify Gd moment effect.
(Right picture shows a chamical etching process to remove indium on rear surface of the substrate.)

Students in Bachelar course and Master course presented their intemidiate progress and were inspected.
Yuuki Uda in Master course have passed the scrutiny without problems.

We attended the joint conference of the Chugoku-Shikoku Branch of both the Physical Society of Japan(PSJ) and the Japan Society of Applied Physics(JSAP), which was held at Tokiwa Campus of Yamaguchi Univ.

• 'Magnetic properties of Gd-Fe mixed magnetic thin films with periodic line patterned structure' presented by T.Yamano
• 'Optical Properties of Diluted Magnetic Semiconductor GaGdAs/GaAs' presented by S.Matsumoto
• 'Layer thickness dependence of the MOKE signal in a Fe/Gd magnetic multilayer thin film' presented by H.Takemasa
• 'Analysis of electronic state and concentration of diluted magnetic semiconductor GaGdAs by means of photoelectron spectroscopy' presented by N.Funaki

We attended the International Conference on Magnetism 2012 (ICM2012), which was held at BEXCO, Busan, Korea. Homepage is here. We also met Prof. Caroline Ross and other members of MIT. After the conference, me and Prof. Chunghee Nam of Hannam Univ. have moved to Daejeon, and had a research meeting with Yeonsik Jeong at KAIST.

• 'Magnetism and Optical properties of Diluted Magnetic Semiconductor Superlattice GaGdAs/GaAs with GaGdAs nanograins' H.Miyagawa (poster)
  

Eching system with an 3cm DC sputter ion source has been installed as expansion of the existing MBE system. With this system, one can sputter sample surfaces with slow rate by irradiating Ar ion from this ion source. Complicated structure of thin film can be fabricated on patterned samples by using both techniques of depostion and sputtering. Details can be found at Veeco (3cm DC Source) page.

Students in Bachelar course and Master course presented their theses and were inspected.
Niiyama in Master course, and Kasahara, Matsumoto, Yoshioka, Funaki in Bachelor course, have passed the scrutiny without problems. They are to be complete their cources with some modification of the theses.

As master first grade, Uda has presented and been audited in Opto-Electronics Materials Science group.

We attended the 21st Academic Symposium of MRS-Japan, which was held at Yokohama Open-Port Memorial Hall. Homepage is here.

• 'Structure and magnetic property of periodical line patterns of Gd/Fe multilayer' K.Niiyama (oral)
• 'Electrical properties of GaNAs/GaAs MQW p-i-n junction' K.Arimoto (oral)

Takemasa, Tsutsumi, Yamashita, Yamano, have come to our lab as Undergraduate members. Welcome to Miyagawa Lab! Following pics were taken at the Welcome Party in AMS at 24th Nov.

We attended the Solid State Devices and Materials Conference, SSDM2011, which was held at WINC Aichi, Nagoya. Homepage is here.

• 'Structure and Magnetic Properties of Diluted Magnetic Semiconductor Superlattice GaGdAs/GaAs Grown by MBE' Y.Uda (poster)

Students in Bachelar course and Master course presented their intemidiate progress and were inspected.
Niiyama in Master course, and Kasahara, Matsumoto, Yoshioka, Funaki in Bachelor course, have passed the scrutiny without problems.

We performed the experiments of PL measuremenst of GaGdAs at Akiyama Lab, Institute of Solid State Physics, University of Tokyo, Kashiwa, Chiba. We'd like to express appreciation to Prof. Akiyama, Dr. Mochizuki, and other members in Akiyama Labo for helping us. For some samples, PL emission did not occur, even if the sample is estimated to have good crystalinity from XRD or TEM. The finer scrunity seems to be necessary to check the sample crystalinity and impurity.

We attended the joint conference of the Chugoku-Shikoku Branch of both the Physical Society of Japan(PSJ) and the Japan Society of Applied Physics(JSAP), which was held at Tottori Univ.

• 'Structure and Magnetic Properties of Diluted Magnetic Semiconductor Superlattice GaGdAs/GaAs Grown by MBE' presented by Y.Uda
• 'Optical and Electrical Properties of Diluted Magnetic Semiconductor GaAs:RE' presented by S.Matsumoto
• 'Fabrication and magnetic domain observation of magnetic line array of Gd/Fe multilayer' presented by Y.Yoshioka
• 'Electronic state properties of diluted magnetic semiconductor GaGdAs by means of Photoelectron Spectroscopy' presented by N.Funaki

AGM(Alternating Gradient Magnetometer), SPM(Scanning Probe Microscope: AFM, MFM, STM), ESR(Electron Spin Resonance) have been moved to Analysis Room in a new building of Integrated Research Facility, and now available.
If there is any problem, please contact us.

Big earthquack with magnitude 9.0 occured at east coast of Tohoku Sanriku Area. The earthquack triggered extremely destructive Tsunami waves of up to 40.5 metres. Many people's lives were gone with this disaster. The coast area received catastrophic damages, and the radioactive materials began to leak out in the air from the Fukushima Daiichi nuclear power plant. The effort to stop the leackage has been continued still now. (Aug 2011, the recovery effort in the power plant are still tough going. )

Researchers is needed to get heads together and collaborate to rebuild the damaged Japan.
It is the time to think about how to use technology for true development in human futures and civilizations.

The construction of a building for Integrated Research Facility, which locates at just the west side of AMS building, have been completed. The building consists of 9 stories having several rooms for lectures, seminors, experiments, and project researchs. Equipments of Electron Spin Resonance(ESR), and Scaninng Probe Microscopy(SPM), and Magnetization mesurement(AGM) will move into Analysis Room on 1st floor in the building in March.

Master first grade, Niiyama has presented and been audited by members in Opto-Electronics Materials Science group.

Kasahara, Matsumoto, Yoshioka, Funaki, have come to our lab as Undergraduate members. Welcome to Miyagawa Lab!

Students in Bachelar course and Master course presented their intemidiate progress and were inspected.
Sugiyama in Master course, and Uda, Chiku, Miyake in Bachelor course, have passed the scrutiny without problems.

We visited RAMK, the Rovaniemen ammattikorkeakoulu(Rovaniemi University of Applied Sciences), which has been concluded the academic agreement with Kagawa University. RAMK has three campuses and the students learn Information Technology, Tourism, Environmental engineering, Health and Sports, so on. You can find details at RAMK homepage.
Rovaniemi is the capital city of Lapland Province located in north of Finland near Arctic Circle, and has beautiful landscapes of green forest. Calm lakes reflect the blue sky and the sunlight. Finland is one of the safetest country in the world and people are so kind and warm. They speaks Finish and Swedish, as well as English. I've learned just few Finish words, Kiitos ! Nakemiin !

We attended the Joint International Syumbosium of Compounds Semiconductors and Indium Phosphide Related Materials, ISCS2010/IPRM2010, which was held at Sunport Takamatsu, Kagawa. Homepage is here.

• 'MBE Growth of Diluted Magnetic Semiconductor Superlattice GaAsGd/GaAs and Optical and Magnetic Properties' N.Sugiyama (oral)
• 'Fabrication of magnetic line patterns of RE/TM multilayer on semiconductor' K.Niiyama (poster)

A multifunctioned high-resolution X-ray diffractometer has been installed. We can characterize the crystallinity of materials by automatic scanning with high-resolution 4-axis goniometer. We can exploit the most effective system by selecting various attachments, such as parabolic mirror, 4xGe220 monochrometer, hybrid-monochrometer as incident beam optics, and parallel plate collimator, 3xGe220 analyzer, 256ch-PIXCEL detector as diffracted beam optices. In addition, the software simulation can help your analysis of omega-2theta measurement, reciprocal space mapping, reflectivity and so on. Details can be found at PANalytical X'Pert Pro MRD page.

We attended the 57th spring meeting of the Japan Society of Applied Physics(JSAP), which was held at Tokai univ. Shonan campus.

• 'MBE growth of diluted magnetic semiconductor superlattice GaAsGd/GaAs, and optical and magnetic properties' presented by N.Sugiyama

A magnetization measurement system, which provides two mode of AGM(Alternating Gradient Magnetometer) and VSM(Vibration Sample Magnetometer), has been installed. With this system, one can evaluate magnetic properties of various samples from 10 nemu to 10 emu by switching the AGM/VSM mode, in temperture range from LHe to RT. Details can be found at Princeton Micromag 2900/3900 page.

A page monitoring the current status of metal MBE machine has been completed. The values of vacuum pressures and tempertures of cells can be checked anytime at anywhere through this page. (You can also access this page through the top tab menu 'Monitor'.)

Quanta 3D Dual Beam system has been installed. With this system, we can do both processing with FIB (Focused Ion Beam) and characterizing with SEM at the same chamber. FIB can etch sample to form sub-micron patterning. We can make patterned magnetic structures with metalic electrodes or electric paths, and also make cross-sectional thin samples for TEM observation. Details can be found at FEI Quanta 3D 200i page.

Uda, Chiku, Miyake, have come to our lab as Undergraduate members. Welcome to Miyagawa Lab!

We attended the 70th Autumn Meeting of the Japan Society of Applied Physics(JSAP), which was held at Toyama Univ.

We attended the joint conference of the Chugoku-Shikoku Branch of both the Physical Society of Japan(PSJ) and the Japan Society of Applied Physics(JSAP), which was held at Hiroshima Univ.

• 'Optical and transport properties of Diluted Magnetic Semiconductor GaAsGd' presented by N.Sugiyama
• 'Growth and structural analysis of magnetic semiconductor superlattice GaAsGd/GaAs' presented by K.Niiyama
• 'Estimation of oxygen composition of Gd multilayer by means of XPS' presented by H.Miyagawa(K.Kimura)

A measurement system of XPS(X-ray Photoemission Microscopy), also known as ESCA(Electron Spectroscopy for Chemical Analysis), has been installed at Takahashi Lab*, Faculty of Education, Kagawa University.
The system has some optional functions which allow us to obtain depth-profile of sample composition by sputtering method, and to obtain angle-resolved level scheme of binding energies. You can also obtain DOS around Fermi level from UPS measurement using Hg Lamp. Details of the system can be found at ULVAC PHI 5000T VersaProbe page.

* Takahashi Lab and Miyagawa Lab has been collaborating since 2004.

We attended 'Nano-lattice new technology develop cneter' Symposium, which was held by High-Tech Reserch Center of Toyota Technological Institue, Nagoya.

Light and simple, text-based pages of this site have been uploaded here.

We attended and presented at Symposium of Advanced Research of Engineering which was held by Faculty of Engneering, Kagawa University. Details are here.
Presentation posters are here, and this is the abstract.

We attended and presented at International Conference of Magnetism and Magnetic Materials whish was held in Austin, US
We happily met with Professor Ross, and Ross group members.
MMM Intermag page is here.

Accel Program Report by miyagawa

MBE2008

Ross Group
M.I.T.

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