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Magnetization dynamics and spin diff...

Cywinski, Lukasz.

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Magnetization dynamics and spin diffusion in semiconductors and metals.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Magnetization dynamics and spin diffusion in semiconductors and metals./
作者:	Cywinski, Lukasz.
面頁冊數:	200 p.
附註:	Adviser: Lu Jeu Sham.
Contained By:	Dissertation Abstracts International68-04B.
標題:	Physics, Condensed Matter. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3259622

Magnetization dynamics and spin diffusion in semiconductors and metals.
Cywinski, Lukasz.

Magnetization dynamics and spin diffusion in semiconductors and metals. - 200 p.

Adviser: Lu Jeu Sham.

Thesis (Ph.D.)--University of California, San Diego, 2007.

Spintronics is an emerging field of research focused on introducing the electron spin degree of freedom into electronics. Its aims include devising new means of magnetization manipulation in ferromagnets and creating systems in which the electrical expression of spin-related phenomena is possible. In this dissertation we present theoretical work important for both of these goals.Subjects--Topical Terms:

1018743
Physics, Condensed Matter.

Magnetization dynamics and spin diffusion in semiconductors and metals.
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035 $a (UMI)AAI3259622
035 $a AAI3259622
040 $a UMI $c UMI
100 1 $a Cywinski, Lukasz. $3 1271694
245 1 0 $a Magnetization dynamics and spin diffusion in semiconductors and metals.
300 $a 200 p.
500 $a Adviser: Lu Jeu Sham.
500 $a Source: Dissertation Abstracts International, Volume: 68-04, Section: B, page: 2427.
502 $a Thesis (Ph.D.)--University of California, San Diego, 2007.
520 $a Spintronics is an emerging field of research focused on introducing the electron spin degree of freedom into electronics. Its aims include devising new means of magnetization manipulation in ferromagnets and creating systems in which the electrical expression of spin-related phenomena is possible. In this dissertation we present theoretical work important for both of these goals.
520 $a In a process of ultrafast light-induced demagnetization the magnetization of a ferromagnet decreases on a sub-picosecond time-scale following an excitation by a strong laser pulse. We present a theory of this phenomenon which is applicable to ferromagnetic (III,Mn)V semiconductors. Using it we qualitatively explain the experimental results obtained recently in these materials. We also give a theory of ultrafast demagnetization in transition metals, in which we put previously proposed approaches on a sound conceptual basis, and analyze a new mechanism of demagnetization due to emission of spin waves by hot carriers.
520 $a Recent progress in growth of metal-semiconductor interfaces has enabled efficient spin-polarized transport between metallic ferromagnets and semiconductors such as GaAs. We present a theory of diffusive spin transport in such metal-semiconductor structures. In contrast to popular one-dimensional approach, we take into account realistic two-dimensional lateral geometry of these systems. We also focus on room temperature regime. Our analysis of spin accumulation achievable in systems of sub-micron dimensions leads to a proposal of a new family of spintronic devices with multiple ferromagnetic terminals in contact with a semiconductor channel. We show that in a three-terminal "spin transistor" digital electric expression of spin accumulation is possible. We also calculate the time-dependent spin transport induced by rotation of one of the magnets in this system, and we show that electrical sensing of magnetization dynamics is realistic in metal-semiconductor structures. An analogous five terminal system can work as a reprogrammable logic gate, with the logic inputs and the gate functionality encoded in the directions of the ferromagnetic terminals. A system capable of electrical detection of circular polarization of light is also modeled. All these proposals will hopefully set new directions in applied spintronics research and stimulate new experiments.
590 $a School code: 0033.
650 4 $a Physics, Condensed Matter. $3 1018743
650 4 $a Physics, Theory. $3 1019422
690 $a 0611
690 $a 0753
710 2 0 $a University of California, San Diego. $b Physics. $3 1035951
773 0 $t Dissertation Abstracts International $g 68-04B.
790 $a 0033
790 1 0 $a Butov, Leonid V. $e committee member
790 1 0 $a Sham, Lu Jeu, $e advisor
790 1 0 $a Wang, Deli $e committee member
790 1 0 $a Yu, Edward T. $e committee member
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3259622