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Ultrafast Manipulation of Magnetic O...

Yang, Yang.

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Ultrafast Manipulation of Magnetic Order with Electrical Pulses.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Ultrafast Manipulation of Magnetic Order with Electrical Pulses./
Author:	Yang, Yang.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
Description:	116 p.
Notes:	Source: Dissertation Abstracts International, Volume: 78-11(E), Section: B.
Contained By:	Dissertation Abstracts International78-11B(E).
Subject:	Materials science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10281912
ISBN:	9780355034035

Ultrafast Manipulation of Magnetic Order with Electrical Pulses.
Yang, Yang.

Ultrafast Manipulation of Magnetic Order with Electrical Pulses. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 116 p.

Source: Dissertation Abstracts International, Volume: 78-11(E), Section: B.

Thesis (Ph.D.)--University of California, Berkeley, 2017.

During the last 30 years spintronics has been a very rapidly expanding field leading to lots of new interesting physics and applications. As with most technology-oriented fields, spintronics strives to control devices with very low energy consumption and high speed. The combination of spin and electronics inherent to spintronics directly tackles energy efficiency, due to the non-volatility of magnetism. However, speed of operation of spintronic devices is still rather limited (~nanoseconds), due to slow magnetization precessional frequencies.

ISBN: 9780355034035Subjects--Topical Terms:

543314
Materials science.

Ultrafast Manipulation of Magnetic Order with Electrical Pulses.
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100 1 $a Yang, Yang. $3 1030201
245 1 0 $a Ultrafast Manipulation of Magnetic Order with Electrical Pulses.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2017
300 $a 116 p.
500 $a Source: Dissertation Abstracts International, Volume: 78-11(E), Section: B.
500 $a Advisers: Lane Martin.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 2017.
520 $a During the last 30 years spintronics has been a very rapidly expanding field leading to lots of new interesting physics and applications. As with most technology-oriented fields, spintronics strives to control devices with very low energy consumption and high speed. The combination of spin and electronics inherent to spintronics directly tackles energy efficiency, due to the non-volatility of magnetism. However, speed of operation of spintronic devices is still rather limited (~nanoseconds), due to slow magnetization precessional frequencies.
520 $a Ultrafast magnetism (or opto-magnetism) is a relatively new field that has been very active in the last 20 years. The main idea is that intense femtosecond laser pulses can be used in order to manipulate the magnetization at very fast time-scales (~100 femtoseconds). However, the use of femtosecond lasers poses great application challenges such as diffraction limited optical spot sizes which hinders device density, and bulky and expensive integration of femtosecond lasers into devices.
520 $a In this thesis, our efforts to combine ultrafast magnetism and spintronics are presented. First, we show that the magnetization of ferrimagnetic GdFeCo films can be switched by picosecond electronic heat current pulses. This result shows that a non-thermal distribution of electrons directly excited by laser is not necessary for inducing ultrafast magnetic dynamics.
520 $a Then, we fabricate photoconductive switch devices on a LT-GaAs substrate, to generate picosecond electrical pulses. Intense electrical pulses with 10ps (FWHM) duration and peak current up to 3A can be generated and delivered into magnetic films. Distinct magnetic dynamics in CoPt films are found between direct optical heating and electrical heating.
520 $a More importantly, by delivering picosecond electrical pulses into GdFeCo films, we are able to deterministically reverse the magnetization of GdFeCo within ~10ps. This is more than one order of magnitude faster than any other electrically controlled magnetic switching. Our results present a fundamentally new switching mechanism electrically, without requirement for any spin polarized current or spin transfer/orbit torques. Our discovery that ultrafast magnetization switching can be achieved with electrical pulses will launch a new frontier of spintronics science and herald a new generation of spintronic devices that operate at high speed with low energy consumption.
520 $a At last, to push ultrafast spintronics to practical use, ultrafast switching of a ferromagnetic film is desired. By exploiting the exchange interaction between GdFeCo and ferromagnetic Co/Pt layer, we achieved ultrafast (sub 10ps) switching of ferromagnetic film with a single laser pulse. This result will open up the possibility to control ferromagnetic materials at ultrafast time scale, critical for practical applications.
590 $a School code: 0028.
650 4 $a Materials science. $3 543314
650 4 $a Electrical engineering. $3 649834
650 4 $a Physics. $3 516296
690 $a 0794
690 $a 0544
690 $a 0605
710 2 $a University of California, Berkeley. $b Materials Science and Engineering. $3 2094994
773 0 $t Dissertation Abstracts International $g 78-11B(E).
790 $a 0028
791 $a Ph.D.
792 $a 2017
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10281912