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Electron transport in strong magneti...

Lambert, Nicholas John.

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Electron transport in strong magnetic field gradients.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Electron transport in strong magnetic field gradients./
作者:	Lambert, Nicholas John.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2007,
面頁冊數:	150 p.
附註:	Source: Dissertations Abstracts International, Volume: 75-06, Section: C.
Contained By:	Dissertations Abstracts International75-06C.
標題:	Electromagnetics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=U601635
ISBN:	9781303569753

Electron transport in strong magnetic field gradients.
Lambert, Nicholas John.

Electron transport in strong magnetic field gradients. - Ann Arbor : ProQuest Dissertations & Theses, 2007 - 150 p.

Source: Dissertations Abstracts International, Volume: 75-06, Section: C.

Thesis (Ph.D.)--University of Bath (United Kingdom), 2007.

The physics of magnetic edge states and snake orbits in two dimensional electron gases (2DEGs) formed in Dy/AlGaAs/GaAs heterostructures is investigated. Such orbits are formed when a ferromagnetic stripe deposited on a semiconductor heterostructure is magnetised. The stray field from the stripe results in a gradient in the perpendicular component of the field at the 2DEG of the order of 10 6T/m. Magnetoresistance of a narrow, dry-etched, 2DEG channel subject to a high magnetic field gradient is investigated. The channel is shown to display positive, but asymmetric, magnetoresistance. A model is proposed in which positive and negative currents experience a different confining potential due to the field gradient. This alters the number of transverse current carrying modes in the channel, and so changes the channel conductivity. Devices we have termed snake state spectrometers have been fabricated and tested. These consist of point contacts positioned to discretised the snake orbits formed in a channel subject to a magnetic field gradient. A third point contact acts to selectively transmit snake orbits with appropriate orbital parameters. Using these devices, we have detected the transmission of discrete snake orbits. A theory is described in which electrons in snake orbits couple to the electromagnetic field. This results in conversion of electrical energy to microwaves. Preliminary experiments designed to test this theory led to the resistive detection of ferromagnetic resonance in the dysprosium stripe overlying the 2DEG.

ISBN: 9781303569753Subjects--Topical Terms:

3173223
Electromagnetics.
Subjects--Index Terms:

Electron transport

Electron transport in strong magnetic field gradients.
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520 $a The physics of magnetic edge states and snake orbits in two dimensional electron gases (2DEGs) formed in Dy/AlGaAs/GaAs heterostructures is investigated. Such orbits are formed when a ferromagnetic stripe deposited on a semiconductor heterostructure is magnetised. The stray field from the stripe results in a gradient in the perpendicular component of the field at the 2DEG of the order of 10 6T/m. Magnetoresistance of a narrow, dry-etched, 2DEG channel subject to a high magnetic field gradient is investigated. The channel is shown to display positive, but asymmetric, magnetoresistance. A model is proposed in which positive and negative currents experience a different confining potential due to the field gradient. This alters the number of transverse current carrying modes in the channel, and so changes the channel conductivity. Devices we have termed snake state spectrometers have been fabricated and tested. These consist of point contacts positioned to discretised the snake orbits formed in a channel subject to a magnetic field gradient. A third point contact acts to selectively transmit snake orbits with appropriate orbital parameters. Using these devices, we have detected the transmission of discrete snake orbits. A theory is described in which electrons in snake orbits couple to the electromagnetic field. This results in conversion of electrical energy to microwaves. Preliminary experiments designed to test this theory led to the resistive detection of ferromagnetic resonance in the dysprosium stripe overlying the 2DEG.
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