speakers’ profile 9 february 2007 · name: koki takanashi institution: institute for materials...

LYON TOHOKU

Speakers’ profile9 February 2007

Session #1Materials Science

Chairman

Name: Jean-Yves CavailléInstitution: INSA - LyonPosition: Professor, Director of Materials Engineering and

Science laboratory (MATEIS)

e-mail: [email protected]

- Master Science diploma (DEA) in "Materials Physics" ofParis VI University

- Engineer Doctor degree (Aix-Marseille III):"Study of IonImpacts on Field Emitter Crystals")

- Ph.D. degree (Institut National des Sciences Appliquées -INSA): "Study by Mechanical Spectrometry of theMolecular Mobility in Amorphous Polymer "

Main Topics:

Materials Sciences and Engineering & Solid State Physics- Physical (and more precisely mechanical and electrical) properties

of polymers and amorphous materials in their solid state;

- Relationships between molecular mobility and strain-stress behavior;- Heterogeneous systems: semicristalline polymers, blends, composites

and nanocomposites

Works & publications: 130 works published in international journals with referees; 120conferences, and 45 invited conferences. (H number = 27)Member of ACS, French Group of Polymers (GFP), French Society ofPhysics (SFP)Member of the editorial board of the Composite Science andTechnology Journal; regular reviewer for Polymers, Macromolecules,J. Polym. Sci., etc.Expert for various evaluation comities of the Research Ministry, CNRSand foreign institutes (Tohoku, Japan, etc.)

9 F E B R U A R Y 2 0 0 7SESSION #1: MATERIALS SCIENCE

Chairman

Name: Koki TakanashiInstitution: Institute for Materials Research (IMR)

Tohoku UniversityPosition: Professor


Brief Resume of past and present activities 1981 BSc, Department of Physics, University of Tokyo1986 PhD, Institute for Solid State Physics, University of

Tokyo1986-2000 from Research Associate to Associate Professor, IMR,

Tohoku University(1994-1995 Alexander-von-Humboldt Research Fellow,FZ-Jülich, Germany)

2000-present Professor, IMR, Tohoku University

Research interests include magnetism and spin dependent transportin metallic superlattices and granular materials, magnetic nanostructu-res for spin electronics, and self-organized superstructured materials. Prominent achievements include fabrication of artificial orderedalloys by monatomic layer control, observation of spin dependentsingle electron tunneling in metallic nanoparticles, fundamentalstudy of coercivity and nanostructure in hard magnetic thin films, andnuclear magnetic resonance study of interface magnetism in metallicsuperlattices.


Name: Gilbert Fantozzi Institution: INSA de LYON

MATEIS UMR CNRS 5510Position: Professor


Brief Resume of past and present activitiesBorn in Cran-Gevrier (France) in 1942, G.Fantozzi graduated from theNational Institute of Applied Science of Lyon in Materials Science andEngineering in 1963. He joined INSA of Lyon in 1963. He is the headof the Ceramic Group of the Groupe d’Etudes de MétallurgiePhysique et de Physique des Matériaux. The Ceramic Group has astaff of 30 searchers and has extensive experience in the ceramicsprocessing and the study of thermo-mechanical behaviour of cera-mics.G.Fantozzi is a specialist in structural ceramics and relation betweenmicrostructure (processing) and properties. He his working on pro-cessing, shaping, green machining, sintering and thermo-mechanicalbehaviour of ceramics, cermets, refractories and composites. He haspublished more than 250 papers in international journals and givenmore than 40 invited lectures. He his Member of the Permanent Executive Committee of theEuropean Ceramic Society on behalf of the French Ceramic Society.

Title of presentation:Nanostructured Ceramics by G.Fantozzi, H.Reveron,V.Garnier

AbstractNanostructured ceramics present peculiar mechanical and physicalproperties which cannot be obtained by using conventional ceramics.So, the nanostrured ceramics can be used for numerous applications:biomaterials, space, aeronautics, automotive… The nanoceramicsand nanocomposites ceramics allows to increase hardness, fracturestrength, creep resistance. However, the mechanisms responsible for this improvement are notyet well understood and the microstructures are not totally optimi-zed.In this lecture, we shall examine the different routes of elaboration ofnanostructured ceramics, the sintering and the microstructure andproperties by considering the slow crack growth and the creep beha-viours.


Name: Koki TakanashiInstitution: Institute for Materials Research (IMR)



Brief Resume of past and present activities1981 BSc, Department of Physics, University of Tokyo1986 PhD, Institute for Solid State Physics, University of

Tokyo1986-2000 from Research Associate to Associate Professor, IMR,

Tohoku University(1994-1995 Alexander-von-Humboldt Research Fellow,FZ-Jülich, Germany)

2000-present Professor, IMR, Tohoku University

Research interests include magnetism and spin dependent transportin metallic superlattices and granular materials, magnetic nanostructu-res for spin electronics, and self-organized superstructured materials. Prominent achievements include fabrication of artificial orderedalloys by monatomic layer control, observation of spin dependentsingle electron tunneling in metallic nanoparticles, fundamentalstudy of coercivity and nanostructure in hard magnetic thin films, andnuclear magnetic resonance study of interface magnetism in metallicsuperlattices.

Title of presentation:Fabrication of metallic nanoparticles for spin-dependent single

electron tunneling

AbstractTunnel magnetoresistance (TMR) has attracted much attention inrecent years because of potential applications for magnetic randomaccess memories (MRAMs) and various spin-electronic devices. A lot of studies have been devoted to magnetic tunnel junctions(MTJs) with layered structure consisting of ferromagnetic metal/insu-lator/ferromagnetic metal. If the size of MTJ is so small that theelectrical charging energy overcomes thermal fluctuation, single electron tunneling (SET) phe-nomena represented by Coulomb blockade and Coulomb staircaseappear. In previous papers, we reported remarkable TMR behaviordue to spin dependent SET, using a device structure with a microfa-bricated Co-Al-O granular film. Recently, spin dependent SET has been investigated in two-dimen-sional assembly of metallic nanoparticles, including magnetic andnonmagnetic, epitaxial grown on a monocrytalline MgO tunnel barrier. In this talk, the fabrication of self-assembled metallic nano-particles for the study on spin dependent SET and its application toelectronic devices are reviewed.


Name: Xavier BlaseInstitution: LPMCN, Université Lyon I and CNRSPosition: Research Director, head of the Theory

and Simulation group, LPMCN


Brief Resume of past and present activitiesAfter a Ph.D at UC Berkeley, California, in theoretical condensed mat-ter physics (advisor: Pr. Steven G. Louie), and a 2-years post-doc atLausanne, Switzerland, with Pr. Roberto Car, X. Blase was hired atCNRS in 1996 to develop an activity in the field of ab initio simula-tions in condensed matter physics. He is mainly interested in thestudy of nanostructured materials, including nanotubes, cage-likematerials (fullerenes, clathrates), or nanowires. Various subjects, such as growth mechanisms, plastic, electronic,superconducting or transport properties, have been addressed in thelast few years. In parallel, X. Blase is interested in the development ofefficient codes for the calculation of the excited state properties(TDDFT, GW) and transport properties (Landauer).

Title of presentation:Superconductivity in doped semiconductors: from clathrates to

diamond and cubic silicon

AbstractWe will review some of our latest work concerning the superconduc-ting behaviour of highly doped column-IV semiconductors, includingdoped clathrates [1], diamond [2] and silicon [3]. Silicon clathrates arecage-like sp3 semiconductors which upon intercalation doping by Babecome superconducting with a transition temperature of 8 K. In thecase of diamond and cubic silicon, substitutional doping by boronbeyond a few percent has been achieved, yielding a superconductingtransition of a few tenth to a few Kelvin in the case of c-Si and diamondrespectively. We will show that such transitions can be explainedwithin a standard phonon-mediated BCS mechanism with an electron-phonon coupling constant much larger than that observed in fulleri-des.

[1] "Superconductivity in doped sp3 semiconductors: the case of the cla-thrates', D. Connétable et al., Phys. Rev. Lett. 91, 247001 (2003).[2] “Role of the Dopant in the Superconductivity of Diamond", X. Blase, Ch.Adessi, D. Connétable, Phys. Rev. Lett. 93, 237004 (2004).[3] "Superconductivity in cubic silicon", E. Bustarret et al., Nature (London)444, 465-468 (2006).


Name: Junji SaidaInstitution: Center for Interdisciplinary Research,

Tohoku UniversityPosition: Associate Professor


Brief Resume of past and present activitiesMaterial Science of Bulk Metallic Glasses:- Investigation of the stabilizing mechanism of bulk metallic glasses

by transformation studies and local structural analysis- Nanoscale structure evaluation of the bulk metallic glasses during

the transformation and deformation by transmission electronmicroscopy (TEM) observation and X-ray diffraction (XRD) analysis

- Development of new bulk metallic glasses with good mechanicalproperties

- Studies of the ductility of bulk metallic glasses by the deformationinduced-nanostructure transition.

Title of presentation:Nanostructure control and properties of Zr-based metallic glas-

ses

AbstractRecently, a number of bulk metallic glasses with extremely highglass-forming ability were reported in Zr-based multicomponent alloysystems. They have attracted much attention in the aspects of thescientific interests in a high stability of glassy state. More recently, itis found that various nanocrystalline phases such as icosahedral qua-sicrystalline phase are formed as a primary precipitation phase froma glassy state. We report the characterization such as structure, composition andkinetics of nanostructure controlled Zr-Al-Ni-Cu(-NM) (NM: noblemetal) metallic glasses by nanoscale analysis of XRD, TEM. We intendto investigate the formation mechanism of metastable nanocrystallinephases correlated with their high stability of glassy state. Moreover,the improvement of mechanical properties with the formation ofnanocrystal will be reported. These results lead us to the conclusionthat it is very useful for the formation of new nanostructured materialsbased on the bulk metallic glasses.


Name: Guillaume Saint-Girons Institution: LEOM-Ecole Centrale de LyonPosition: Researcher


Brief Resume of past and present activitiesGuillaume Saint-Girons is researcher at LEOM (Ecole Centrale deLyon), specialist in the growth and physical properties of crystallinematerials. He has obtained his PhD in material science in 2002. UntilMay 2006, he was located at the Laboratoire de Photonique et deNanostructures (LPN, Marcoussis – France). He has been involved inresearches concerning the growth by metalorganic vapour phase epi-taxy of III-V quantum dots for photonic applications and the study oftheir structural and optical properties. He is presently located at LEOM (Ecole Centrale de Lyon), and is stu-dying the molecular beam epitaxy of high-k oxide on silicon, and themonolithic integration of semiconducting materials (Si, Ge, III-V) onsilicon via oxide buffers for advanced applications in nanophotonicsand nanoelectronics

Title of presentation:Toward the monolithic fabrication of complex crystalline

oxide/IV-IV/III-V heterostructures on silicon for nanoelectronic

and nanophotonic applications.

AbstractIn this contribution, we will give a global insight of our researchesconcerning the monolithic integration of complex III-V/IV-IV/oxideheterostructures on silicon for advanced applications in nanoelectro-nic and nanophotonic. The control of the epitaxial growth of suchheterostructures could open the way to the realization of high perfor-mance microelectronic and photonic devices integrated on a universalSi platform, and would lead to a breakthrough for micro-optoelectronicsystems. The heteroepitaxial growth of semiconductor on oxide and of oxideon Si is particularly challenging, and its control requires a re-visitationof the basis concepts of the epitaxial growth. We will give an over-view of the different problems that occur during the growth of thesematerials. The questions of the wetting, chemical stability of the inter-face and crystallographic compatibility between the materials will beaddressed, and these points will be illustrated by a few examplesextracted from our experiments.


Name: Hiroyuki Nojiri Institution: Institute for Materials Research (IMR)



Brief Resume of past and present activities1984 Bachelor's degree in department of Physics, Kyoto

University

1993 Dr. degree of Physics in department of Physics, OsakaUniversity

1991-1995 Research Associate at Institute for Solid State Physics,University of Tokyo

1995-2001 Associate Professor at Institute for Material Research,Tohoku University

2001-2004 Professor at Department of Physics, OkayamaUniversity

2004-present Professor at Institute for Material Research, TohokuUniversity

Study of quantum magnetism in wide range such as low-dimensionalquantum spin systems, strongly correlated electron system andmolecular magnetsHigh magnetic field and high frequency THz-electron spin resonancein magnetic compoundsX-ray and neutron scatterings in high magnetic field, study of fieldinduced phase transitionsProject leader of Grant-in-Aid for Scientific Research on priority Areas“High Field Spin Science in 100T” (2005-2009).

Title of presentation:Use of internal degree of freedoms in nano magnetic molecules

for information storage

AbstractInformation in magnetic recording is usually stored as a magnetiza-tion in bulk ferromagnet. In nano magnetic molecules, use of the ferromagnetic moment is difficult for superparamagnetic behavior. Inthis talk, a new concept to use various internal degrees of freedomsin nano magnetic materials will be discussed. In a ring shaped mate-rial, spin chirality can be used to represent two metastable quantumstates. Those states are manipulated by using quantum tunneling intime depending magnetic fields. In a polyhedral magnetic cluster, aresidual magnetic moment is caused by an unbalance of localmagnetic moments. A hysteresis in the branching of multiple quantum energy states anda large degeneracy are the origins of the unbalance. The use of thoseinternal degree of freedom is important to overcome the limitation inmagnetic recording.


Name: Enrico Mund Institution: Institute for Materials Research, Tohoku University

Title of poster:Relationship between grainsize distribution and coercivity in Fe-

Nb-B-P-Cu nanocrystalline alloy

Brief Resume of present activitiesTEM observations, digital image processing, statistical analysis

Name: Jing Ju Institution: Physics Department, Graduate School of

Science, Tohoku University

Title of poster:A new nickel polyborate and its properties

Brief Resume of present activitiesI am interested in the magnetic properties of various transition metalpolyborates. The flexibility of boron to adopt either trigonal or tetra-hedral oxygen coordination provides a variety of low-dimensionalnetwork structures. In addition, borate anions have been well knownto mediate magnetic exchange interactions between bridged magne-tic ions. A series of transition metal polyborates with novel structureshave been synthesized, and all of them show interesting magneticproperties.

Name: Kotone Akiyama Institution: Institute for Materials Research, Tohoku University

Title of poster:Functional probes for scanning probe microscopy

Brief Resume of present activitiesI am developing a nano-lithographic technique using non-contact ato-mic force microscope (nc-AFM) with an originally developed Au-tipcantilever. The AFM lithography is a method to draw a nano-scalemetal line on the substrate with a metal-coated tip and tapping-modeAFM has been mainly used. So far, a metal line as narrow as 22 nmhas been attained. By utilizing the Au-tip cantilever, whose tip apexwas sharpened by focused ion beam by a factor of 5 compared withthe coated tip, and operating in nc-AFM, which has better distanceregulation, I plan to draw a Au line with a width less than 10 nm. Thefinal purpose of the lithographic method is to draw electrodes brid-ging micron-scale metal pads and a single molecule for electricalconductance measurements of the molecule


JUNIOR RESEARCHERS’ PROFILE

Name: Mohammad Khazaei Institution: Institute for Materials Research, Tohoku University

Title of poster:Structural characterization of nanotubes' tips through experimen-

tal field emission spectroscopy

Brief Resume of present activitiesDue to high potential applications of carbon nanotubes in nanodevi-ces, our studies are mainly centered on carbon nanotubes. There is afundamental question about carbon nanotubes how the tip geome-tries of carbon nanotubes affect the emission process. To answer thisquestion, we have assigned different cap geometries with differentdistributions of pentagon rings. Our calculations show that each capstructure has a specific field emission pattern, and a unique workfunction. Based on our calculations and experimental results, we sug-gest a set of simple rules to determine the configuration of the capsthrough experimental field emission patterns. This indicates the effi-ciency of using field-emission microscopy for determining the struc-ture of curve nanoscale surfaces, where conventional transmissionelectron microscopy (TEM) and scanning tunneling microscopy(STM) methods have limited abilities.

Name: Shiyang Ji Institution: Institute of Multidisciplinary Research for

Advanced Materials, Tohoku University

Title of poster:The Preparation High Purity Iron and MBE Growth of Beta-FeSi2

Brief Resume of present activitiesDr.S.Y.Ji holds COE fellowship from Dec.2006. Before that, he wasemployed as Educ. & Res. Supporter in Inst. of Multidisciplinary. Res.for Adv. Mater., Tohoku Univ., where he graduated in Mar. 2006 andwas certificated a Ph.D in Materials Science. In 1998 and 2001, he got a B.S in Applied Physics from East ChinaUniv. of Sci. and Tech., and a M.S. in Optical Engineering fromChangchun Inst. of Optics, Fine Mech. and Phys., Chin. Acad. of Sci.,respectively. In the recent 4 years, his research focuses on MBE growth of semi-conducting iron disilicide. Before 2002, he researched the low tempe-rature polycrystalline silicon (LTPS) film and optimal design of TFTdevices. Besides, he also had experiences in the preparation of ZnOultra particle film for photovoltaic devices.


JUNIOR RESEARCHERS’ PROFILE

speakers’ profile 9 february 2007 · name: koki takanashi institution: institute for materials...

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