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Gu, B.; Ziman, T.*; 前川 禎通
no journal, ,
The discovery of ferromagnetism in dilute magnetic semiconductor (DMS) has created much activity in the field of spintronics. We develop a general combined numerical method for studying DMS, which can treat correlations correctly. We have studied the crystal structure effect on the ferromagnetic correlations in the compound (Zn,Mn)O, the possible d0 ferromagnetism in the compound Mg(O,N), the possible magnetic states for the negatively charged nitrogen-vacancy center (N-V-) in diamond, and the ferromagnetic correlations in the recently observed new generation I-II-V semiconductors including Li(Zn,Mn)As and Li(Zn,Mn)P and Li(Cd,Mn)P. It is expected that this general numerical method can be applied in a wide range of realistic magnetic systems.
Sr
CuO
脇本 秀一
no journal, ,
Systematic neutron and resonant-inelastic X-ray scattering studies on overdoped LaSrCuO (LSCO) were performed to clarify the relation between magnetic excitation and the superconductivity. Low energy magnetic excitation decreases with doping and disappears concomitantly with the disappearance of the superconductivity at 
= 0.30. On the other hand, high energy magnetic excitation persists even in the overdoped samples with a dispersion relation identical to the non-doped AF magnet. This clarifies that the magnetic excitation can be classified into two energy regions.
髭本 亘
no journal, ,
J-PARCミュオン施設(MUSE)で建設が進んでいる超低速ミュオン顕微鏡は、世界的に見てこれまでにない性能をもつ2つのビームが供給される。ひとつは超低速ミュオンであり、表面から界面などを含めた深さ依存性をナノメーター分解能で測定可能である。もうひとつはそのビームを加速して得られるマイクロビームであり、マイクロメータースケールにまで絞られたビームを用いた研究が行われる。これらによる空間イメージングにより、物質生命科学において重要な役割を持つ表面や界面などを新たな視点で研究可能となる。講演では超低速ミュオンプロジェクトの現状を報告する。
前川 禎通
no journal, ,
Spintronics is not just a new type of electronics in the 21 century but provides a variety of possibilities for energy conversion. It is discussed that the conversion among electricity, magnetism and heat is a new challenge in physics. This is "power spintronics". The talk is to present "power spintronics" and its future.