Download or read book Ultrafast Magnetization Dynamics written by Simon Woodford and published by Forschungszentrum Jülich. This book was released on 2008 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ultrafast Magnetism I written by Jean-Yves Bigot and published by Springer. This book was released on 2014-08-05 with total page 361 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Ultrafast Magnetization Dynamics of Magnetic Nanostructures written by Hassan Kesserwan and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Time resolved Investigation of Ultrafast Magnetization Dynamics written by David Weder and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ultrafast Magnetization Dynamics in Ferromagnetic Thin Films and Heterostructures written by Yongfeng Guan and published by . This book was released on 2008 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ultrafast Magnetization Dynamics for Spin transfer Torque Based Nano device written by 張瑞航 and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Induced Versus Intrinsic Magnetic Moments in Ultrafast Magnetization Dynamics written by Moritz Hofherr and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ultrafast Magnetization Dynamics Induced by Femtosecond Laser Pulses written by Alexander Weber and published by . This book was released on 2004 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optically Induced Ultrafast Magnetization Dynamics in Heterostructures written by Martin Stiehl and published by . This book was released on 2022* with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ultrafast Magnetization Dynamics of Lanthanide Metals and Alloys written by Muhammad Sultan and published by . This book was released on 2012 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ultrafast Magnetization Dynamics of SrRu03 Thin Films written by Matthew Clemens Langner and published by . This book was released on 2009 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Element resolved Ultrafast Magnetization Dynamics in Ferromagnetic Alloys and Multilayers written by Andrea Eschenlohr and published by . This book was released on 2012 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Efficient Optical control of Ultrafast Magnetization Dynamics in Metallic Alloys written by Rajasekhar Medapalli and published by . This book was released on 2014 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ultrafast Magnetization Dynamics in the Presence of Strong Spin Orbit Coupling written by Colleen Kantner and published by . This book was released on 2010 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: The time-resolved magneto-optical Kerr effect is used to study magnetization dynamics in thin films of SrRuO3. This thesis focuses on two topics in particular: the influence of epitaxial strain on magnetization dynamics and magnetic orientation, and the origin of the dramatic slowing down of the demagnetization time near the Curie temperature. Magnetization dynamics in SrRuO3 are initiated by a temperature dependent rotation of the magnetocrystalline anisotropy field direction upon thermal excitation by the laser. The resulting dynamics depend on the orientation of the anisotropy field in the sample. We observe a change in the orientation as a function of epitaxially strain by looking at SrRuO3grown on various substrates with (001) orientation and distinct in-plane lattice parameters. We find that in SrRuO3 films under compressive strain, the anisotropy field moves in a plane perpendicular to the film surface. Beyond a certain degree of tensile strain, the anisotropy field moves in the plane parallel to the surface of the film. Support of this result from theoretical calculations and XRD measurements is discussed and attempts to strain tune films with a piezoelectric substrate are described. Near the Curie temperature, the demagnetization time in SrRuO3/SrTiO3(111) is found to increase by more than a factor of ten. Here, we study this effect in detail and derive an equation for the demagnetization time in terms of the spin flip time, starting from detailed balance and borrowing from a recent spin-based model for demagnetization[57, 58]. The demagnetization time is found to be proportional to the spin flip time and inversely proportional to the reduced temperature near Tc, allowing us to measure the spin flip time. We also relate the spin flip time and the damping parameter to the Curie temperature and find that the previously speculated upon relationship between the damping parameter in SrRuO3 and the anomalous Hall effect is strengthened.
Download or read book Ultrafast Magnetization Dynamics Studies Using an X ray Streakcamera written by A. Young and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The spin dynamics of ferromagnetic thin films following an excitation by ultrashort 100-fs near-infrared laser pulses has recently received much attention. Here, a new approach is described using x-ray magnetic circular dichroism to investigated emagnetization and magnetization switching processes. In contrast to magneto-optical measurements, x-ray dichroism has the advantage of determining separately the spin and orbital components of the magnetic moment. The relatively low time resolution of the synchrotron x-ray probe pulses (80 ps FWHM) is overcome by employing an ultrafast x-ray streak camera with a time resolution of
Download or read book Ultrafast Magnetization Dynamics in Heusler Compounds written by Daniel Steil and published by . This book was released on 2012 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Light induced Ultrafast Magnetization Dynamics Using Ab Initio Methods written by Philippe Scheid and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis begins with a review of the current experimental and theoretical state of the art related to the light-induced ultrafast demagnetization and the all-optical helicity-dependent switching. This is followed by an overview of density functional theory, upon which relies most of the work reported thereafter. The first set of results concerns the ab initio study of the effect of a rise in the electronic temperature on the magnetized matter properties, and more specifically Fe, Co, Ni and FePt. We show that the magnetic moment carried by each atom disappears at the so-called Stoner temperature, and that this phenomenon impacts the electronic energy and specific heat, even at low electronic temperature. Then, we show that upon an increase in the electronic temperature, the interatomic Heisenberg exchange, which is responsible for the magnetic ordering, decreases. Using the atomistic Langevin Landau-Lifshitz-Gilbert equation, we demonstrate that this decrease is enough to induce a large reduction of the average magnetization by creating transversal excitations. The second set of results regards the origin of the helicity-dependent light-induced dynamics. While the literature attributes it mainly to the inverse Faraday effect, we argue that another and novel phenomenon, which occurs during the absorption of the light, may be more suited to account for the experimental dynamics. Indeed, using the Fermi golden rule and ground state density functional theory calculations in Fe, Co, Ni and FePt, we show that, as the light is absorbed and electrons are excited, concurrently to the increase of the electronic energy, the spin-state is also changed in presence of spin-orbit coupling. This results in a difference in the value of the atomic magnetic moments, persisting even after the light is gone, as opposed to the inverse Faraday effect. Then, using real-time time-dependent density functional theory, we compute the magnetization dynamics induced by real optical and XUV femtosecond circularly polarized pulses. We show that, in both cases the dynamics is helicity-dependent and that this characteristic is largely amplified in the XUV regime involving the semi-core 3p states. Finally, we compare the relative role of the inverse Faraday effect and the magnetization induced during the absorption of the light and show that the latter plays a prominent role, especially after the light has gone, and in the XUV regime.
