H.GAN H.YAMAMOTO H.HASEGAWA             S.MATSUZAKA  K.OHTANI  K.MIURA F.MATSUKURA  T.DIETL  H.OHNO                                        S.IKEDA  Y.OHNO	H.YAMOTO

Staff:
Hideo OHNO,	Professor
Yuzo OHNO,	Associate Professor
Fumihiro MATSUKURA,	Associate Professor
Shoji IKEDA,	Associate Professor *
Keita OHTANI,	Assistant Professor
Katsuya MIURA,	Research Fellow *
Shunichiro MATSUZAKA,	Research Fellow
Huadong GAN,	Research Fellow *
Hiroyuki YAMAMOTO,	Research Fellow *
Hiroki YAMAMOTO,	Research Fellow *
( * Nano-Spin Memory )

Molecular beam epitaxy (MBE)- sputtering equipment for the growth of III-V based ferromagnetic/nonmagnetic semiconductor heterostructures and magnetic metal devices.

Schematic of magnetization direction control by the application of electric-filed.

2Mb Spin-Transfer Torque RAM (SPRAM) chip developed in collaboration with Hitachi.

Research activities:

Our research activities cover the areas of preparation, characterization, and application of new classes of compound semiconductors and their quantum structures for new functional high-speed devices, which can be realized by controlling the electronic and spin states in semiconductors. More specifically, our research is focused on (1) Semiconductor Spintronics, where non-volatile spin memory and new functionality based on the spin degree of freedom using III-V based ferromagnetic/non-magnetic semiconductor heterostructures are being explored, (2) THz-far infrared lasers based on the intersubband optical transition in broken-gap semiconductor heterostructures (InAs/GaSb), (3) the quantum transport phenomena in two-dimensional electron gases, and (4) non-volatile spin memories based on magnetic metal devices.

Materials of interest include such nonmagnetic semiconductor heterostructures as GaAs/AlAs and InAs/GaSb, and III-V based ferromagnetic semiconductors such as (Ga,Mn)As and (In,Mn)As. All these materials are prepared by Molecular Beam Epitaxy.

Research topics:

1. Semiconductor Spintronics
   1. Properties and Application of III-V Based Ferromagnetic Semiconductors and their Quantum Structures
   2. Spin Memory
   3. Spin Coherence in Semiconductor Nanostructures and Its Application to Quantum Information Technology
2. Quantum Cascade Structures and Their Application to THz Optical Devices
3. Growth and Characterization of Semiconductor Quantum Nano-Structures
4. Magnetic Metal Devices and their Application to Nonvolatile Spin Memories

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