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Ferromagnetic Relaxation And Interlayer Exchange Coupling In Magnetic Films And Heterostructures
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Book Synopsis Ferromagnetic Relaxation and Interlayer Exchange Coupling in Magnetic Films and Heterostructures by : Alexander Yulievich Dobin
Download or read book Ferromagnetic Relaxation and Interlayer Exchange Coupling in Magnetic Films and Heterostructures written by Alexander Yulievich Dobin and published by . This book was released on 2003 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Magnetic Heterostructures by : H. Zabel
Download or read book Magnetic Heterostructures written by H. Zabel and published by Springer. This book was released on 2007-10-26 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heterostructures consist of combinations of different materials, which are in contact through at least one interface. Magnetic heterostructures combine different physical properties which do not exist in nature. This book provides the first comprehensive overview of an exciting and fast developing field of research, which has already resulted in numerous applications and is the basis for future spintronic devices.
Book Synopsis Investigation of Magnetic Relaxation Mechanisms and Dynamic Magnetic Properties in Thin Films Using Ferromagnetic Resonance (fmr) Technique by : Behrouz Khodadadi
Download or read book Investigation of Magnetic Relaxation Mechanisms and Dynamic Magnetic Properties in Thin Films Using Ferromagnetic Resonance (fmr) Technique written by Behrouz Khodadadi and published by . This book was released on 2016 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: Investigating the damping processes and the behavior of dynamic magnetic properties in ferromagnetic thin films has been an important key towards design and fabrication of different microwave and magnetic recording devices. This thesis discusses the dynamic magnetic properties and also the physics behind different relaxation mechanisms in ferromagnetic thin films using comprehensive experimental investigations by means of broadband ferromagnetic resonance (FMR) technique. In chapter one the basics of ferromagnetic resonance technique and the experimental features of the FMR setup used in this study are discussed, also the FMR data analysis is explained. Chapter two is devoted to the study of the interfacial perpendicular magnetic anisotropy (PMA) and damping parameter in Co2FeAl thin films. In chapter three broadband temperature dependent FMR measurements were carried out on Ni80Fe20/Gd thin films to investigate the behavior of ferromagnetic relaxation, and gyromagnetic ratio as the system goes through the Curie temperature of Gd. In chapter four, the ferromagnetic relaxation mechanisms in ferrites are discussed. The low loss Nikel Ferrite and Lithium ferrite single crystal, thin and ultra-thin films were characterized by detailed FMR measurements to investigate the effect of microstructural defects on the magnetization relaxation. A comprehensive study on the interlayer exchange coupling strength in Co90Fe10/Ru/ Co90Fe10 multilayers is the subject of chapter five, in which the mutual spin pumping is discussed as a recently discovered channel for relaxation in exchange coupled multilayers.
Book Synopsis Magnetic Order and Coupling Phenomena by : Christian Schubert
Download or read book Magnetic Order and Coupling Phenomena written by Christian Schubert and published by Springer. This book was released on 2014-06-03 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents recent developments in magnetic coupling phenomena of ferrimagnetic rare-earth transition-metal Tb-Fe alloys and coupled systems consisting of ferri-/ferromagnetic heterostructures. Taking advantage of the tunability of the exchange coupling between ferrimagnetic and ferromagnetic layers by means of stoichiometry of the Tb-Fe layer, the variable number of repetitions in the Co/Pt multilayer as well as the thickness of an interlayer spacer, it is demonstrated that large perpendicular unidirectional anisotropy can be induced at room temperature. This robust perpendicular exchange bias at room temperature opens up a path towards applications in spintronics.
Book Synopsis Rôle of Interfaces on the Magnetic Properties of Ferromagnetic Metal/organic Heterostructures by : Garen Avedissian
Download or read book Rôle of Interfaces on the Magnetic Properties of Ferromagnetic Metal/organic Heterostructures written by Garen Avedissian and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In hybrid organic spintronic devices, the active regions are essentially the hybrid interfaces. The first part of this thesis shows that molecular exchange bias in Co/MTPP and Co/CoPc systems is not an interface effect but originates from air-driven oxidation of the Co films. The second part introduces a new Ferromagnetic Nuclear Resonance methodology which showed that 15 monolayers of ZnTPP are required to obtain heterostructures with continuous molecular films and that their morphology depends on the nature of the underlayer (Co or Fe). In addition, the interfaces are asymmetrical with sharp Co/ZnTPP interface and rough ZnTPP/Co interface. These analyses have been confirmed by TEM. Moreover, FNR showed that no interfacial magnetic hardening effect exists in these systems. This is consistent with the fact that the Co/ZnTPP interfaces are governed by weak van der Waals interactions and that no signature of strong chemical bonds between interfacial ZnTPP molecules and Co atoms has been identified. Finally, the magnetic measurements suggest that an antiferromagnetic indirect exchange coupling takes place between the FM electrodes through the organic film.
Book Synopsis Magnetism of Surfaces, Interfaces, and Nanoscale Materials by : Robert E. Camley
Download or read book Magnetism of Surfaces, Interfaces, and Nanoscale Materials written by Robert E. Camley and published by Elsevier. This book was released on 2015-10-27 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past 30 years, magnetic research has been dominated by the question of how surfaces and interfaces influence the magnetic and transport properties of nanostructures, thin films and multilayers. The research has been particularly important in the magnetic recording industry where the giant magnetoresistance effect led to a new generation of storage devices including hand-held memories such as those found in the ipod. More recently, transfer of spin angular momentum across interfaces has opened a new field for high frequency applications.This book gives a comprehensive view of research at the forefront of these fields. The frontier is expanding through dynamic exchange between theory and experiment. Contributions have been chosen to reflect this, giving the reader a unified overview of the topic. Addresses both theory and experiment that are vital for gaining an essential understanding of topics at the interface between magnetism and materials science Chapters written by experts provide great insights into complex material Discusses fundamental background material and state-of-the-art applications, serving as an indispensable guide for students and professionals at all levels of expertise Stresses interdisciplinary aspects of the field, including physics, chemistry, nanocharacterization, and materials science Combines basic materials with applications, thus widening the scope of the book and its readership
Book Synopsis Magnetic Thin Films, Multilayers and Superlattices by : A. Fert
Download or read book Magnetic Thin Films, Multilayers and Superlattices written by A. Fert and published by Elsevier. This book was released on 1991-06-06 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt: Materials Research in thin and ultrathin magnetic structures is a multidisciplinary field which heavily relies on state-of-the-art growth, characterization and theoretical approaches to build a comprehensive physical picture on how magnetic properties depend on interfacial structural issues, interlayer coupling and transport phenomena. Often in this field, the critical properties and characterization required necessitates knowledge of structural and magnetic phenomena extending over several atomic planes. Atomic controlled growth techniques are required and atomic sensitivity is needed from magnetic and structural probes. This critical knowledge is vital for device applications, providing the basis for the synergistic interactions that are predominant in this field of research. This volume is the definitive reference source for anyone interested in the latest advances and results of current experimental research in ultrathin film magnetism.
Book Synopsis Ferromagnetism and Interlayer Exchange Coupling in Thin Metallic Films by : Jochen Kienert
Download or read book Ferromagnetism and Interlayer Exchange Coupling in Thin Metallic Films written by Jochen Kienert and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 1006 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Confined Magnon Modes and Anisotropic Exchange Interaction in Ultrathin Co Films by : Ying-Jiun Chen
Download or read book Confined Magnon Modes and Anisotropic Exchange Interaction in Ultrathin Co Films written by Ying-Jiun Chen and published by Logos Verlag Berlin GmbH. This book was released on 2017 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: A fundamental need in wireless communication and modern computer processors is to fabricate faster, smaller, and lower power-consumption circuits. A promising approach is the utilization of spin waves, or rather, magnons in ferromagnetic films. Quantum confinement in ultra-thin films permits the coexistence of several exchange-dominated magnon modes with terahertz-range frequencies and sub-nanometer length scales. By means of spin-polarized electron energy loss spectroscopy (SPEELS), these exchange-dominated terahertz magnons are directly probed in ultra-thin cobalt films on Ir(001), Cu(001) and Pt(111) single crystal surfaces. The dispersion relation of the quantized magnon modes depends particularly on the interatomic exchange interaction in individual layers. By tuning the exchange interaction, modes with opposite group velocities, and thus an opposite propagation direction of the wave packets, can be generated. Ab initio theoretical calculations as well as an analytical Heisenberg model reveal a spatial localization of the modes at the surface, interior, and interface of the film that opens an experimental access to the layer-dependent magnetic properties. In itinerant ferromagnets like cobalt the magnetic properties depend sensitively on many-body correlation effects in the electronic structure. Here, it is shown for the first time that spin-dependent correlations lead to a pronounced renormalization of the energy of the highest magnon mode by up to 260 meV, explaining the significant overestimation of theoretically predicted magnon energies and interatomic exchange interaction found in literature.
Book Synopsis Effect of Exchange Coupling with Antiferromagnetic Thin Layers on Magnetic Properties of Ferromagnetic Films by : Ofelia Tatiana Luminita Traistaru
Download or read book Effect of Exchange Coupling with Antiferromagnetic Thin Layers on Magnetic Properties of Ferromagnetic Films written by Ofelia Tatiana Luminita Traistaru and published by . This book was released on 2006 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Interrelation Between Perpendicular Magnetic Anisotropy and Exchange Coupling in Low Dimensional Ferromagnetic-antiferromagnetic Ultrathin Film Systems by : 王柏堯
Download or read book Interrelation Between Perpendicular Magnetic Anisotropy and Exchange Coupling in Low Dimensional Ferromagnetic-antiferromagnetic Ultrathin Film Systems written by 王柏堯 and published by . This book was released on 2009 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ferromagnetic-relaxation Theory by : Marshall Sparks
Download or read book Ferromagnetic-relaxation Theory written by Marshall Sparks and published by . This book was released on 1964 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Influence of Interlayer Exchange Coupling on Magnetic Ordering in Fe-based Heterostructures by : Martin Pärnaste
Download or read book The Influence of Interlayer Exchange Coupling on Magnetic Ordering in Fe-based Heterostructures written by Martin Pärnaste and published by . This book was released on 2007 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Magnetic Coupling and Relaxation at Interfaces Measured by Ferromagnetic Resonance Spectroscopy and Force Microscopy by : Rohan Adur
Download or read book Magnetic Coupling and Relaxation at Interfaces Measured by Ferromagnetic Resonance Spectroscopy and Force Microscopy written by Rohan Adur and published by . This book was released on 2014 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis I shall demonstrate the use of FMR spectroscopy and FMRFM to study static and dynamic couplings in ferromagnetic materials with emphasis on interfaces. First, I introduce the basic concepts of ferromagnetic resonance and spin wave relaxation. Second, I present the results of using conventional FMR spectroscopy to study the tuneable static effective fields in a ferromagnet, which manifest as anisotropy fields that define the energy landscape and equilibrium direction of the magnetization. Third, I explore both dipolar and exchange couplings between magnetizations which are dynamic in nature, and only manifest when the magnetizations are precessing. Fourth, I demonstrate the use of FMRFM to observe the modification of localized modes in a ferromagnetic film engineered with a lateral interface. Fifth, I describe the design of an FMRFM microscope and management of spurious background effects in an FMRFM experiment. Sixth, I measure relaxation from the localized modes in an insulating ferromagnetic film, which reveal a size-dependent damping effect that was unexpected in an insulating system. This suggests that spin transport from the interface of the localized mode can dictate its relaxation, even in the absence of conduction electrons. Finally, I observe a frequency-independent linewidth broadening contribution that also depends on mode size and this may give a measure of the inhomogeneous fields within a ferromagnetic sample
Book Synopsis Magnetic Exchange Phenomena in Reduced Dimensions Studied by Neutron Scattering by : Thomas Saerbeck
Download or read book Magnetic Exchange Phenomena in Reduced Dimensions Studied by Neutron Scattering written by Thomas Saerbeck and published by . This book was released on 2012 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: [Truncated abstract] This thesis deals with magnetic exchange interactions in thin lm magnetic materials focusing on phenomena related to intrinsic parameters of magnetic, structural and chemical order. In particular, the investigation is of two magnetic thin film systems, a Cu0.94Mn0.06/Co multilayer displaying a temperature-dependent magnetic ordering due to exchange coupling originating from dilute paramagnetic Mn spins, and thin films of chemical order modulated FePt3, showing a unique self-exchange bias effect. Detailed real-space models of the magnetic structure are obtained using polarized neutron reffectometry and high-angle neutron diffraction, speciffcally chosen to probe interface and bulk magnetic characteristics, respectively, in connection with complementary structural and magnetic characterization tools. It will be discussed, how the random distribution of dilute magnetic impurity centers in the Cu0.94Mn0.06/Co multilayers leads to a temperature-dependent interlayer exchange coupling with a strong biquadratic component. This manifests in an in-plane magnetic domain structure with a canted magnetization, i.e. a deviation from collinear alignments of external magnetic field and magnetization. The domain magnetizations show a high degree of vertical correlation in the form of columns throughout the multilayer, in which the sense of canting alternates in sign for each subsequent magnetic layer. Detailed analysis of temperature and field dependences of the magnetic structure lead to fundamental exchange energies, which are utilized in constructing a phenomenological model of exchange interactions between dilute magnetic impurities and the ferromagnetic layers. In addition to this, the second study deals with the effect of chemical order of the constituent atoms in the alloy FePt3 on the magnetic order on atomic and sub-micrometer scales. Depending on the long-range chemical order, ferromagnetic or antiferromagnetic grains exist below the respective transition temperatures. As such, the system constitutes a new way of controlling the magnetic composition of thin lms without changing the materials composition, stoichiometry or lattice structure. The interfacing of the two magnetic grains leads to the observation of a unique self-exchange bias effect. Based on studies in thin films of FePt3 with varying degree of chemical order and the evolution of exchange bias with respect to interface and volume of the chemically ordered grains, a mono-stoichiometric FePt3 ferromagnetic/antiferromagnetic multilayer is presented. Analysis of the magnetic structure in the arti cially layered thin film elucidates the magnetic composition and origin of the observed exchange bias. Due to the unique mono-stoichiometric structure, the system opens possibilities to study magnetic phenomena in perfect lattice-matched systems...
Book Synopsis Magnetic Exchange Coupling in Hard-soft Ferromagnetic Composite Thin Films of CoPt-Co by : Jihwan Kim
Download or read book Magnetic Exchange Coupling in Hard-soft Ferromagnetic Composite Thin Films of CoPt-Co written by Jihwan Kim and published by . This book was released on 2001 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of magnetic exchange coupling in nanocomposites of magnetically-hard phases combined with magnetically-soft phases is important for the development of high-performance permanent magnets. The present work aimed to elucidate the microstructure-exchange coupling relationship in model hard/soft bilayers of CoPt(L10, hard)/Co(soft) in both the as-deposited and annealed states. The CoPt layer (25--100 nm) was deposited at room temperature and annealed at 700°C to develop the magnetically hard, ordered L1 0 structure prior to room-temperature deposition of Co (2.8--225 nm). The transformation from FCC to L10 in CoPt was accompanied by grain growth and evolution of a & lang;111 & rang; fiber texture. The L1 0 mean domain area reached approximately one sixth of the mean grain area in nearly-fully and fully ordered CoPt. The coercivity of CoPt and the contribution of a pinning-type mechanism to the coercivity increased with increasing annealing time, concurrent with the increase in L10 fraction. In CoPt/Co bilayers, Co exhibited a & lang;0001 & rang; fiber texture. For as-deposited bilayers, the exchange length of Co was close to the magnetic domain wall width for CoPt. Annealing the bilayers at 300--450°C resulted in minor microstructural changes, increased the extent or strength of coupling and thereby enhanced the reversal coherency of the bilayers such that a Co layer of twice the CoPt domain wall width was fully coupled to the CoPt. Note that in bilayers with robust coupling both phases are affected, i.e., the magnetically-hard phase is exchange-softened, while the magnetically-soft phase is exchange-hardened. In contrast to lower-temperature anneals, annealing at 500--550°C, or for extended periods at 450°C, resulted in interdiffusion of Co and CoPt, consumption of the latter and formation of two new FCC and HCP Co-Pt solid solutions. These interdiffused bilayers showed an increased reversal coherency and a highly developed out-of-film plane anisotropy. When the magnetic and microstructural data are considered together, this study shows that the properties of hard/soft nanocomposites depend not only on the dimensions of both phases, but also on the physical and magnetic characteristics of each phase. A most significant outcome of this work is the demonstration that exchange coupling may be altered, and perhaps tailored, by processing-induced changes in the interphase interface.
