Ultrafast Laser Induced Dynamics in Magnetic Semiconductors PDF Download
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Author:
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ISBN: 9789462599628
Category :
Languages : en
Pages :
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Book Description
Author:
Publisher:
ISBN: 9789462599628
Category :
Languages : en
Pages :
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Book Description
Author: Jonas Jakob Becker
Publisher:
ISBN: 9789402800975
Category :
Languages : en
Pages :
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Book Description
In dit proefschrift combineer ik hoge magneetvelden tot 37.5 T met ultrakorte laser pulsen in een unieke opstelling, om de magnetische eigenschappen van nanometer-dunne lagen te onderzoeken. Ik laat zien, dat femtoseconde laser pulsen gebruikt kunnen worden om magnetisme in materialen voor de volgende generatie harde schijven te karakteriseren en manipuleren. Dit onderzoek is van belang voor de dataopslag industrie. Verder toon ik aan, dat de magnetische structuur van bepaalde amorfe ijzer-legeringen gemanipuleerd kan worden door laser pulsen en (hoge) magneetvelden. Deze veranderingen van de magnetische structuur leiden tot grote veranderingen in de magnetizatiedynamica op een ultrakorte tijdsschaal. Ultrasnelle magnetizatiedynamica van deze niet collineaire magnetische structuren is een fundamenteel onderwerp dat slechts beperkt is onderzocht.
Author: Jean-Yves Bigot
Publisher: Springer
ISBN: 3319077430
Category : Science
Languages : en
Pages : 361
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Book Description
This volume on Ultrafast Magnetism is a collection of articles presented at the international “Ultrafast Magnetization Conference” held at the Congress Center in Strasbourg, France, from October 28th to November 1st, 2013. This first conference, which is intended to be held every two years, received a wonderful attendance and gathered scientists from 27 countries in the field of Femtomagnetism, encompassing many theoretical and experimental research subjects related to the spins dynamics in bulk or nanostructured materials. The participants appreciated this unique opportunity for discussing new ideas and debating on various physical interpretations of the reported phenomena. The format of a single session with many oral contributions as well as extensive time for poster presentations allowed researchers to have a detailed overview of the field. Importantly, one could sense that, in addition to studying fundamental magnetic phenomena, ultrafast magnetism has entered in a phase where applied physics and engineering are playing an important role. Several devices are being proposed with exciting R&D perspectives in the near future, in particular for magnetic recording, time resolved magnetic imaging and spin polarized transport, therefore establishing connections between various aspects of modern magnetism. Simultaneously, the diversity of techniques and experimental configurations has flourished during the past years, employing in particular Xrays, visible, infra-red and terahertz radiations. It was also obvious that an important effort is being made for tracking the dynamics of spins and magnetic domains at the nanometer scale, opening the pathway to exciting future developments. The concerted efforts between theoretical and experimental approaches for explaining the dynamical behaviors of angular momentum and energy levels, on different classes of magnetic materials, are worth pointing out. Finally it was unanimously recognized that the quality of the scientific oral and poster presentations contributed to bring the conference to a very high international standard.
Author: Michael Coey
Publisher: Springer
ISBN: 9783030632083
Category : Science
Languages : en
Pages : 1679
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Book Description
This handbook presents a comprehensive survey of magnetism and magnetic materials. The dramatic advances in information technology and electromagnetic engineering make it necessary to systematically review the approved key knowledge and summarize the state of the art in this vast field within one seminal reference work. The book thus delivers up-to-date and well-structured information on a wealth of topics encompassing all fundamental aspects of the underlying physics and materials science, as well as advanced experimental methodology and applications. It features coverage of the host of fascinating and complex phenomena that arise from the use of magnetic fields in e.g. chemistry and biology. Edited by two internationally renowned scholars and featuring authored chapters from leading experts in the field, Springer’s Handbook of Magnetism and Magnetic Materials is an invaluable source of essential reference information for a broad audience of students, researchers, and magnetism professionals.
Author: Loic Le Guyader
Publisher:
ISBN: 9789090228877
Category :
Languages : en
Pages : 123
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Author: Guanqi Li
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Paul Corkum
Publisher: Springer Science & Business Media
ISBN: 3540959467
Category : Science
Languages : en
Pages : 1031
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Book Description
Ultrafast Phenomena XVI presents the latest advances in ultrafast science, including both ultrafast optical technology and the study of ultrafast phenomena. It covers picosecond, femtosecond and attosecond processes relevant to applications in physics, chemistry, biology, and engineering. Ultrafast technology has a profound impact in a wide range of applications, amongst them biomedical imaging, chemical dynamics, frequency standards, material processing, and ultrahigh speed communications. This book summarizes the results presented at the 16th International Conference on Ultrafast Phenomena and provides an up-to-date view of this important and rapidly advancing field.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 177
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Book Description
The field of spintronics offers perspectives for seamless integration of coupled and inter-tunable electrical and magnetic properties in a single device. For integration of the spin degree of freedom with current electronic technology, new semiconductors are needed that show electrically-tunable magnetic properties at room temperature and above. Dilute magnetic semiconductors derived from III-V compounds, like GaMnAs and InMnAs, show coupled and tunable magnetic, transport, and optical properties, due to the fact that their ferromagnetism is hole-mediated. These unconventional materials are ideal systems for manipulating the magnetic order by changing the carrier polarization, population density, and energy band distribution of the complementary subsystem of holes. This is the main theme we cover in this thesis. In particular, we develop a unique setup by use of ultraviolet pump, near-infrared probe femtosecond laser pulses, that allows for magneto-optical Kerr effect (MOKE) spectroscopy experiments. We photo-excite transient carriers in our samples, and measure the induced transient magnetization dynamics. One set of experiments performed allowed us to observe for the first time enhancement of the ferromagnetic order in GaMnAs, on an ultrafast time scale of hundreds of picoseconds. The corresponding transient increase of Curie temperature (Tc, the temperature above which a ferromagnetic material loses its permanent magnetism) of about 1 K for our experimental conditions is a very promising result for potential spintronics applications, especially since it is seconded by observation of an ultrafast ferromagnetic to paramagnetic phase transition above Tc. In a different set of experiments, we"write" the magnetization in a particular orientation in the sample plane. Using an ultrafast scheme, we alter the distribution of holes in the system and detect signatures of the particular memory state in the subsequent magnetization dynamics, with unprecedented hundreds of femtosecond detection speed. The femtosecond cooperative magnetic phenomena presented here further our understanding of Mn-hole correlations in III-V dilute magnetic semiconductors, and may well represent universal principles of a large class of carrier-mediated ferromagnetic materials. Thus they offer perspectives for future terahertz (1012 Hz) speed"spintronic" functional devices.
Author: Ekkes H. Brück
Publisher: Elsevier
ISBN: 0128210249
Category : Technology & Engineering
Languages : en
Pages : 216
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Book Description
Handbook of Magnetic Materials, Volume 29, highlights new advances in the field, with this new volume presenting interesting chapters written by an international board of authors on topics such as spin-orbit torque. Provides the authority and expertise of leading contributors from an international board of authors Presents the latest release in the Handbook of Magnetic Materials series
Author: Ilja Mingareev
Publisher: Cuvillier Verlag
ISBN: 3736928785
Category : Science
Languages : en
Pages : 158
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Book Description
Diese Arbeit leistet einen Beitrag zum Verständnis der ultraschnellen Abtrags- und Schmelzphänomene von Festkörpern bei Anregung mit Laserstrahlung großer Intensität. Fundamentale Aspekte des laserinduzierten Abtrags von Reinmetallen (Au, Al, Cu, Fe, W) mit Ultrakurzpuls-Laserstrahlung wie z.B. Laser-Materie-Wechselwirkung, Plasmabildung, Verdampfung und Schmelzdynamik wurden untersucht. Darüber hinaus wurde Schmelzen und Schweißen von technischem Borosilikatglas mittels hochrepetierender Ultrakurzpuls-Laserstrahlung untersucht. Für Untersuchungen der transienten laserinduzierten Vorgänge auf unterschiedlichen Zeitskalen wurden neuartige experimentelle Verfahren entwickelt und eingesetzt. Pumpprobe Photographie wurde für zeitaufgelöste Messungen auf einem erweiterten zeitlichen Detektionsbereich bis ca. 2 Mikrosekunden mit Sub-Pikosekunden Auflösung realisiert. Für Detektion von transienten Brechungsindexmodifikationen und Morphologieänderungen wurde ein neuartiges, zeitaufgelöstes Verfahren zur quantitativen Phasenmikroskopie (TQPm) entwickelt. Die geometrischen und zeitlichen Profile der eingesetzten Laserstrahlung großer Intensität wurden beim Abtragen von Metallen untersucht. Aufheizung des Materials bedingt durch spontane verstärkte Emission mit Pulsdauer im Nanosekundenbereich führt zu einem materialabhängigen Temperaturanstieg von mehreren hundert Kelvin und wurde numerisch untersucht. Zeitaufgelöste Schattenphotographie und quantitative Messungen des Abtragsvolumens von Metallen wurden in unterschiedlichen Umgebungen durchgeführt. Im untersuchten zeitlichen Detektionsbereich kann die beobachtete Abtragsdynamik in mindestens vier charakteristischen Zeitregimes klassifiziert werden: Ausbreitung von dichtem Materialdampf und Plasma, Verdampfung aufgrund der Nukleationseffekte, Abtrag in Form von flüssigen Schmelzstrahlen und Erstarrung. Basierend auf experimentellen Ergebnissen wurde ein qualitatives Modell für laserinduzierten Abtrag von Metallen bei großen Strahlungsintensitäten aufgestellt, welches bedeutende Unterschiede zum Abtragen bei schwellennahen Intensitäten aufweist. Insbesondere sind physikalische Vorgänge die im Zusammenhang mit Materieüberhitzung stehen wie z.B. Phasenexplosion und “boiling crisis”, als entscheidende Abtragsphänomene suggeriert worden. Laserinduziertes Schmelzen von technischem Borosilikatglas mit hochrepetierender Ultrakurzpuls-Laserstrahlung wurde mittels TQPm zeitaufgelöst untersucht. Experimentelle Ergebnisse weisen transiente Brechungsindexmodifikationen auf welche auf Ionisationsprozesse und Verdichtung der Materie zurückzuführen sind. Als eine wichtige Anwendung dieser Prozesse wurde das Mikroschweißen von dünnen Glas- und Silizium-Platten demonstriert. Beim Schmelzen von Material an Substrat-Grenzflächen können konsistente Schweißnähte im Mikrometerbereich erzeugt werden.
