東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Electron transport in noncollinear m...

Zhang, Jianwei.

Linked to FindBook

Google Book

Amazon

博客來

Electron transport in noncollinear magnetic multilayers.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Electron transport in noncollinear magnetic multilayers./
Author:	Zhang, Jianwei.
Description:	142 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-04, Section: B, page: 2128.
Contained By:	Dissertation Abstracts International66-04B.
Subject:	Physics, Condensed Matter. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3170896
ISBN:	9780542072833

Electron transport in noncollinear magnetic multilayers.
Zhang, Jianwei.

Electron transport in noncollinear magnetic multilayers. - 142 p.

Source: Dissertation Abstracts International, Volume: 66-04, Section: B, page: 2128.

Thesis (Ph.D.)--New York University, 2005.

I have studied electron transport in noncollinear magnetic multilayers Co/Cu/Co. We have studied this problem by using the Boltzmann equation in the layer-by-layer approach. My study differs in two fundamental aspects from previous ones that use the Boltzmann approach: I do not a priori set the transverse part of the spinor distributions to zero in the ferromagnetic layers, and I have found the necessary condition and mechanism for the "injection" of these components in the magnetic layers. In this manner I have been able to achieve a steady state for the spin current across the noncollinear multilayer in which the spin current continuously changes its direction over a distance given by a new transport length scale. In my picture the spin angular momentum of the current does not go directly to exerting a torque on the background magnetization; rather it creates the transverse spin accumulation. It is this accumulation exerts the torque on the remainder of the Fermi sea.

ISBN: 9780542072833Subjects--Topical Terms:

1018743
Physics, Condensed Matter.

Electron transport in noncollinear magnetic multilayers.
LDR:02901nmm 2200301 4500 001 1823898
005 20061128084415.5
008 130610s2005 eng d
020 $a 9780542072833
035 $a (UnM)AAI3170896
035 $a AAI3170896
040 $a UnM $c UnM
100 1 $a Zhang, Jianwei. $3 1912993
245 1 0 $a Electron transport in noncollinear magnetic multilayers.
300 $a 142 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-04, Section: B, page: 2128.
500 $a Adviser: Peter M. Levy.
502 $a Thesis (Ph.D.)--New York University, 2005.
520 $a I have studied electron transport in noncollinear magnetic multilayers Co/Cu/Co. We have studied this problem by using the Boltzmann equation in the layer-by-layer approach. My study differs in two fundamental aspects from previous ones that use the Boltzmann approach: I do not a priori set the transverse part of the spinor distributions to zero in the ferromagnetic layers, and I have found the necessary condition and mechanism for the "injection" of these components in the magnetic layers. In this manner I have been able to achieve a steady state for the spin current across the noncollinear multilayer in which the spin current continuously changes its direction over a distance given by a new transport length scale. In my picture the spin angular momentum of the current does not go directly to exerting a torque on the background magnetization; rather it creates the transverse spin accumulation. It is this accumulation exerts the torque on the remainder of the Fermi sea.
520 $a My major finding is that by allowing for the injection of transverse components of the spin current we always obtain a lower resistance of noncollinear magnetic multilayer. In part due to the lower resistance and also due to the larger spin polarization of the current near the interfaces I find the spin torque due to the current is larger when I allow for transverse accumulation, e.g., when adjacent magnetic layers are 150° apart the spin torque is 50% greater for the same amount of electrical energy expended. Also, I have found the transverse spin current can go into the ferromagnetic layers about 3nm for a typical ferromagnetic 3d transition-metal such as Co. This has a direct impact on the thickness dependence of the spin torque in a thin magnetic layer. Finally I have used the time dependent spin diffusion equation, to study the time evolution of spin torque, and find it achieves its steady state in about 75 femtoseconds after undergoing damped oscillation with a period of about 5 femtoseconds.
590 $a School code: 0146.
650 4 $a Physics, Condensed Matter. $3 1018743
650 4 $a Physics, Electricity and Magnetism. $3 1019535
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0611
690 $a 0607
690 $a 0794
710 2 0 $a New York University. $3 515735
773 0 $t Dissertation Abstracts International $g 66-04B.
790 1 0 $a Levy, Peter M., $e advisor
790 $a 0146
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3170896