Download or read book Magnetization Dynamics in Nickel Iron Thin Films written by Albert Santoni 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 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 Magnetization Dynamics Across the First Order Phase Transition in FeRh Thin Films written by Federico Pressacco and published by Universitatsverlag Regensburg. This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Surface Magnetic Properties of Ferromagnetic Nickel Thin Films and Multilayer Structures written by Tianhong Xu and published by . This book was released on 2008 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: Devices based on magnetic multilayer structures are widely used in the magnetic storage industry. The interfacial magnetic behaviour in these and related structures determines their spin-dependent electron transport properties. This thesis addresses the effects of the surface quality and magnetic properties of Ni thin films and multilayer structures to understand the relationship between the microscopic physical and magnetic structure and macroscopic transport properties. The effects of surface roughness on the magnetic properties of Ni-based thin films, nanowires and multilayer structures have been investigated using linear and nonlinear optical Kerr effect methods, magnetometry and scanning probe microscopy. The magnetic properties of Ni films possessing different surface roughness have been investigated through magnetic second harmonic generation (MSHG) studies. MSHG studies show significant differences between the films' magnetic properties, indicating that surface roughness plays an important role in determining the surface magnetic properties. MSHG studies of Ni nanowire arrays show large magnetic contrast associated with large effective surface areas and additional contributions to the susceptibility, not present in thin films. Electrodeposition of Ni/Cu multilayer structures yield films which display giant magneto-resistance (GMR) behaviour. The effects of layer thickness, roughness and deposition method on their macroscopic magnetoresistance are described. In situ scanning tunnelling microscopy (STM) was employed to study the growth kinetics of Ni films on single crystal Au(111) surfaces through electrodeposition. It has been shown that 2-D or 3-D growth of Ni thin films can be controlled by changing the deposition potentials. The nonlinear optical response from the electrodeposited films indicates that Ni films deposited at a low overpotential possess greater magnetic contrasts and coercive fields. This study reveals the important connection between the film growth mechanisms and the magnetic properties in the ferromagnetic materials. Ultrafast magnetization dynamics of electrodeposited nickel surfaces have been studied using time-resolved MSHG with laser pulses of various pump beam fluence. A fast drop of the second-harmonic intensity within 700 fs after optical excitation is observed which is followed by a partial recovery, within a few picoseconds, indicating the surface magnetic property dependence on the magnetization after the perturbation of the pump laser.

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 Magnetization Dynamics in NiFe Thin Films written by Albert Santoni and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The morphology, composition, and magnetic properties of NiFe thin films were characterized. Films with thicknesses up to 137 nm were deposited in an RF induction evaporator at high vacuum (10^-8 mbar). Time resolved magneto-optic Kerr effect microscopy (TR-MOKE) was used to measure the Gilbert damping constant, an important dynamic magnetic property with applications to magnetic data storage. The composition of each film was measured with energy-dispersive X-ray (EDX) microscopy and used to determine the weight percent of Ni and Fe in each film. A trend of increased damping with increased thickness was found, in agreement with published results. Magnetic properties and roughness were found to differ significantly from previous films grown in the same vacuum chamber by Rudge, and are attributed to different growth modes produced by differing deposition conditions. However, the weight percent of Ni in each film was found to be inconsistent, deviating by up to 7% from the Ni80Fe20 evaporation source. Inconsistent composition, caused by the inability to control deposition parameters, prevents insight into Gilbert damping from being drawn from the analysis.

Download or read book Time resolved Magnetization Dynamics in RE TM and Epitaxial Fe Thin Films written by and published by . This book was released on 2013 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High Frequency Magnetization Dynamics and Popcorn Noise in Thin Film Heads written by Francis H. Liu and published by . This book was released on 1994 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magnetization Dynamics in Thin Films and Nanopatterns Studied by Frequency and Time resolved AC polarized Neutron Reflectometry written by Dmytro Gorkov and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magnetism and Magnetization Dynamics in Thin Film Ferromagnets written by and published by . This book was released on 2014 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magnetization Dynamics at the Nanoscale in Nanoparticles and Thin Films written by Sergi Lendínez Escudero and published by . This book was released on 2015 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research in magnetic materials leads to new devices and technologies. As the technology progresses, the devices become smaller and this miniaturization allows more storage capacity and lower costs in the production of new technologies. As new and smaller materials are fabricated, new phenomena appear and thus new physics is needed to describe them. Nanomaterials meet characteristics of both the microscopic quantum world and the macroscopic classic world. This intermediate length scale is known as mesoscale. Nanomaterials can be obtained in a variety of forms, being nanoparticles and magnetic ultra-thin films some of the most used. These magnetic systems are very different in their composition: nanoparticles are grown with chemical reactions, and thin films are grown on a substrate by nanofabrication techniques such as sputtering or electron-beam evaporation. The magnetization might not be uniform in a magnetic thin film or in a large magnetic nanoparticle leading to the formation of magnetic domains. Magnetic domains are static structures that appear due to competition of the different magnetic energies and can be used to store and transport information. In all these systems, the magnetization dynamics gives rise to new behavior not visible in static measurements: quantum steps of the magnetization in molecular magnets; characteristic resonant frequencies that can be used to control the magnetic state of vortices; and formation of magnetic droplet solitons in thin films with perpendicular magnetic anisotropy. Understanding the dynamics of nanomaterials and the evolution of the magnetization is a key process to develop faster devices and technologies. The early studies of molecular magnets showed quantum effects at the macroscopic scale, which have allowed a better understanding of spin. Magnetic vortices have been proposed for multiple applications, from magnetic storage of information to cancer cell destruction. The recently discovered magnetic droplet soliton is also a very good candidate for technological applications due to the low current and magnetic field needed for its generation, and it is now a system with a growing interest in spintronics. In this dissertation we show some new dynamic phenomena. In the first part of the thesis we study systems that allow a macroscopic-spin model where spatial variations of magnetization are neglected. We develop a theory that sets the requirements for the observation of the rotational Doppler effect in a ferromagnetic system and we measure quantum effects in randomly oriented nanoparticles of a single-molecule magnet, which might be a good candidate for the observation of the Doppler effect. In the second part of the thesis, we study the magnetization dynamics in macroscopic systems that require a spatial dependence of the magnetic moment. We generate and control the dynamic states of the magnetic domains with oscillating fields, in the case of magnetic vortices, and with electrical currents, in the case of droplet solitons.

Download or read book The Effects of Gas Occlusions and Strains on the Magnetic Properties of Thin Permalloy Films written by B. J. Nicholson and published by . This book was released on 1965 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report comprises a selective survey of the present knowledge of the effects of occluded gases and strains on the magnetic properties of Permalloy films, particularlly those which have significance for computer switching applications. Other possible techniques for accomplishing future computer switching functions and magnetic film properties are reviewed. Bulk properties are described and compared with corresponding thin film properties. The magnetic properties of epitaxial Permalloy, epitaxial nickel, epitaxial iron, polycrystalline nickel, and polycrystalline iron films are discussed. The effects of various occluded gases on magnetic film properties are summarized. Stresses present in evaporated films and their significance in determining the magnetic properties of thin films are considered. A selected bibliography of 548 references is included. (Author).

Download or read book Magnetization Dynamics in Magnetically Coupled Heterostructures written by Alexander Kaiser and published by Forschungszentrum Jülich. This book was released on 2009 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book In situ Picosecond Time resolved Probing of Magnetization Dynamics in Polycrystalline Ferromagnetic Thin Films written by Jonathan Rudge and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetization dynamics in polycrystalline Permalloy thin films were studied in-situ using a time-resolved magneto-optic Kerr effect microscope (TR-MOKE). The films, in thicknesses from 9 to 22 nm, were thermally evaporated in a high-vacuum (

Download or read book Ultrafast Spin Dynamics and Coherent Magnetization Switching in Ferromagnetic Thin Films written by Ganping Ju and published by . This book was released on 1999 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magnetic Properties of Thin Films of Nickel iron molybdenum written by Guy H. Frindell and published by . This book was released on 1966 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: The properties of thin ferromagnetic films of nickel-iron-molybdenum are studied as a function of composition and method of manufacture. Experimental data are presented and discussed on magnetostriction, anisotropy, dispersion of anisotropy, coercive force, saturation induction, magnetoresistance, and resistance. Many of these results are in general agreement with data published by other authors; the principal exception is the dependence of the coercive force on substrate temperature. (Author).

Download or read book Spin Dynamics and Damping in Ferromagnetic Thin Films and Nanostructures written by Anjan Barman and published by Springer. This book was released on 2017-12-27 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive overview of the latest developments in the field of spin dynamics and magnetic damping. It discusses the various ways to tune damping, specifically, dynamic and static control in a ferromagnetic layer/heavy metal layer. In addition, it addresses all optical detection techniques for the investigation of modulation of damping, for example, the time-resolved magneto-optical Kerr effect technique.