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Magnetic Anisotropy Damping And Interfacial Spin Transport In Pt Lsmo Bilayers
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Book Synopsis Magnetic Anisotropy, Damping, and Interfacial Spin Transport in Pt/LSMO Bilayers by :
Download or read book Magnetic Anisotropy, Damping, and Interfacial Spin Transport in Pt/LSMO Bilayers written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this paper, we report ferromagnetic resonance measurements of magnetic anisotropy and damping in epitaxial La0.7Sr0.3MnO3 (LSMO) and Pt capped LSMO thin films on SrTiO3 (001) substrates. The measurements reveal large negative perpendicular magnetic anisotropy and a weaker uniaxial in-plane anisotropy that are unaffected by the Pt cap. The Gilbert damping of the bare LSMO films is found to be low [alpha] = 1.9(1) × 10-3, and two-magnon scattering is determined to be significant and strongly anisotropic. The Pt cap increases the damping by 50% due to spin pumping, which is also directly detected via inverse spin Hall effect in Pt. Our research demonstrates efficient spin transport across the Pt/LSMO interface.
Book Synopsis Magnetic Anisotropy, Damping and Interfacial Spin Transport in Pt/LSMO Bilayers by : Han Kyu Lee
Download or read book Magnetic Anisotropy, Damping and Interfacial Spin Transport in Pt/LSMO Bilayers written by Han Kyu Lee and published by . This book was released on 2017 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, I describe ferromagnetic resonance measurements of magnetic anisotropy and damping in epitaxial La0.7Sr0.3MnO 3 (LSMO) and Pt capped LSMO thin films on SrTiO3 (001) substrates. The measurements reveal significant negative perpendicular magnetic anisotropy and a weaker uniaxial in-plane anisotropy that both are unaffected by the Pt cap. The Gilbert damping of the bare LSMO films is found to be low alpha = 1.9(1) x 10-3, and two-magnon scattering is determined to be significant and strongly anisotropic in the plane of the film. The Pt cap increases the damping by 50% due to spin pumping, which is also directly detected via inverse spin Hall effect in Pt. This work demonstrates efficient spin transport across the Pt/LSMO interface.
Book Synopsis Spin Dynamics and Damping in Ferromagnetic Thin Films and Nanostructures by : Anjan Barman
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.
Book Synopsis Interfacial Effects in FeCoB Based Magnetic Tunnel Junctions and Spin Hall Effect Bi-layer Structures by : Yun Li
Download or read book Interfacial Effects in FeCoB Based Magnetic Tunnel Junctions and Spin Hall Effect Bi-layer Structures written by Yun Li and published by . This book was released on 2014 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: The transfer of spin angular momentum from a spin-polarized current to a ferromagnet can generate sufficient torque to reorient the magnet's moment, thus this effect has prospective applications in spintronics. In this dissertation, the main theme of my work has been the study of spin-transfer-driven ferromagnetic resonance (STFMR) signals to understand what is the interfacial effects on the spin transfer torque (STT) in magnetic tunnel junction (MTJ) devices with a nanopillar geometry and bilayer spin Hall effect structures. In the first part of my work, I have studied the bias dependence of the spin transfer torques in the as-grown and annealed FeCoB/MgO/FeCoB MTJs by ST-FMR measurement. The motivation of this work was to understand the important mechanisms contributing to the in-plane torque with a view to optimizing the switching current of devices. I have found the annealing reduces the inelastic tunneling component of the junction conductance, and creates or enhances a peak at about 0.15V above the Fermi level in the density of states of the minority band of the electrodes, which may be the reason for the asymmetry of the bias dependence of the in-plane torque. This peak location is essentially the same as the peak of the minority band states that has previously observed on the surface of bcc (100) Fe. The existence of these interfacial states can also explain the asymmetry of the TMR, and the bias dependence of both G AP and GP . As a function of temperature, my experimental STTs can be explained by magnon contributions. My results show that with a relative increase of 50% in tunneling MR, however, both in-plane torque and perpendicular torque have been depressed at low temperature, indicating that magnon assisted tunneling, which results in a spin-flip process for the tunneling electron, has a negative contribution to the spin polarization, but plays a positive role in STT, with the latter consistent with recent theoretical predictions. In the second part of my work, I have studied the spin-torque effects on the FeCoB/W bi-layer structures with different W phases. The motivation of this work was to investigate the spin Hall and spin pumping effects in this system. I have observed a greatly enhanced magnetic damping coefficient for the Fe40Co40B20 layer with [alpha]-W, and I tentatively attribute these results to a significantly enhanced spin pumping effect in [alpha]-W, relative to that in [beta]-W. Magnetization measurements indicate that the two different types of Fe40Co40B20/W bilayers also have substantially different interfacial magnetic anisotropy coefficients.
Book Synopsis Handbook of Spin Transport and Magnetism by : Evgeny Y. Tsymbal
Download or read book Handbook of Spin Transport and Magnetism written by Evgeny Y. Tsymbal and published by CRC Press. This book was released on 2011-08-25 with total page 809 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past several decades, the research on spin transport and magnetism has led to remarkable scientific and technological breakthroughs, including Albert Fert and Peter Grünberg’s Nobel Prize-winning discovery of giant magnetoresistance (GMR) in magnetic metallic multilayers. Handbook of Spin Transport and Magnetism provides a comprehensive, balanced account of the state of the art in the field known as spin electronics or spintronics. It reveals how key phenomena first discovered in one class of materials, such as spin injection in metals, have been revisited decades later in other materials systems, including silicon, organic semiconductors, carbon nanotubes, graphene, and carefully engineered nanostructures. The first section of the book offers a historical and personal perspective of the field written by Nobel Prize laureate Albert Fert. The second section addresses physical phenomena, such as GMR, in hybrid structures of ferromagnetic and normal metals. The third section discusses recent developments in spin-dependent tunneling, including magnetic tunnel junctions with ferroelectric barriers. In the fourth section, the contributors look at how to control spin and magnetism in semiconductors. In the fifth section, they examine phenomena typically found in nanostructures made from metals, superconductors, molecular magnets, carbon nanotubes, quantum dots, and graphene. The final section covers novel spin-based applications, including advanced magnetic sensors, nonvolatile magnetoresistive random access memory, and semiconductor spin-lasers. The techniques and materials of spintronics have rapidly evolved in recent years, leading to vast improvements in hard drive storage and magnetic sensing. With extensive cross-references between chapters, this seminal handbook provides a complete guide to spin transport and magnetism across various classes of materials and structures.
Book Synopsis Spin Current Propagation in Metallic Heterostructure by : Pavlo Omelchenko
Download or read book Spin Current Propagation in Metallic Heterostructure written by Pavlo Omelchenko and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic and structural studies of sputter deposited Py(an alloys, Ni80Fe20) and [Py/Fe] thin films allowed for the characterization of their magnetization dynamics properties relevant for subsequent studies. Spin transport and structural studies of Ta in Py/Ta (single magnetic layer) and Py/Ta/[Py/Fe] (double magnetic layer) structures were performed by spin-pumping. It was found that in order to extract self-consistent spin-pumping parameters it is important to study both the single and double magnetic layer structures. Ferromagnetic resonance studies of Py/Pt/[Py/Fe] multilayers reveal interlayer exchange coupling of ferromagnetic nature. The coupling strength is interpreted by the proximity polarization of the Pt due to the neighboring ferromagnets. The coupled layers exhibit optical and acoustic modes of resonance which provide a very stringent test for the spin-pumping model. The induced magnetic damping of the two modes is found to be very well described by the spin-pumping model suggesting a communication of spin-current between the two magnetic layers. No significant spin memory loss contribution is observed. Lastly, the spin-pumping model is studied in a system in which the coupling is interrupted by a Au spacer layer: Py/Au/Pt/Co. It is found that spin-transport across the Au/Pt interface cannot be modeled by the continuity of chemical potential or the continuity of spin accumulation boundary conditions. A new model is presented which treats Pt as a partial spin-sink and results in good fit to all the data sets. Importantly, both the model and data suggest a large asymmetry in spin transport across the Au/Pt interface.
Book Synopsis Role of Spin Momentum Current in Magnetic Non-Local Damping of Ultrathin Film Structures by : G. Woltersdorf
Download or read book Role of Spin Momentum Current in Magnetic Non-Local Damping of Ultrathin Film Structures written by G. Woltersdorf and published by . This book was released on 2003 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Non-local clamping was investigated by Ferromagnetic Resonance (FMR) using ultrathin magnetic single and double layer structures prepared by Molecular Beam Epitaxy (MBE). The double layer structures show magnetic damping which is caused by spin transport across a normal metal spacer (N). In double layer structures a thin Fe layer, F1, was separated from a thick Fe layer, F2, by a Au(001) sparer. The interface magnetic anisotropies separated the FMR fields of F1 and F2 by a big margin allowing one to investigate FMR in F1 while F2 had a negligible angle of procession, and vice versa. The Fe films in magnetic double layers acquire non-local interface Gilbert damping. It will be shown that the precessing magnetic moments act as spin pumps and spin sinks. This concept was tested by investigating the FMR linewidth around an accidental crossover of the resonance fields for the layers F1 and F2. There is another possible mechanism for non-local damping which is based on a "breathing Fermi surface" of the spacer. The temperature dependence of the non-local damping indicates that this mechanism is weak in Au spacers. Surprisingly the Au spacer acts as an additional impedance for the spin pump mechanism. Finally it will be shown that electron-electron correlations in a Pd spacer can lead to a significant enhancement of the non-local damping.
Book Synopsis Spin Transport Through Magnetic Textures and Bilayers with Interfacial Disorder by : Diana Sergeevna Prychynenko
Download or read book Spin Transport Through Magnetic Textures and Bilayers with Interfacial Disorder written by Diana Sergeevna Prychynenko and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spin Transport and Magnetization Dynamics in Various Magnetic Systems by : Shulei Zhang
Download or read book Spin Transport and Magnetization Dynamics in Various Magnetic Systems written by Shulei Zhang and published by . This book was released on 2014 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: The general theme of the thesis is the interplay between magnetization dynamics and spin transport. The main presentation is divided into three parts. The first part is devoted to deepening our understanding on magnetic damping of ferromagnetic metals, which is one of the long-standing issues in conventional spintronics that has not been completely understood. For a nonuniformly-magnetized ferromagnetic metal, we find that the damping is nonlocal and is enhanced as compared to that in the uniform case. It is therefore necessary to generalize the conventional Landau-Lifshitz-Gilbert equation to include the additional damping. In a different vein, the decay mechanism of the uniform precession mode has been investigated. We point out the important role of spin-conserving electron-magnon interaction in the relaxation process by quantitatively examining its contribution to the ferromagnetic resonance linewidth. In the second part, a transport theory is developed for magnons which, in addition to conduction electrons, can also carry and propagate spin angular momentum via the magnon current. We demonstrate that the mutual conversion of magnon current and spin current may take place at magnetic interfaces. We also predict a novel magnon-mediated electric drag effect in a metal/magnetic-insulator/metal trilayer structure. This study may pave the way to the new area of insulator-based spintronics. In the third part of thesis, particular attention is paid to the influence the spin orbit coupling on both charge and spin transport. We theoretically investigate magnetotransport anisotropy and the conversion relations of spin and charge currents in various magnetic systems, and apply our results to interpret recent experiments.
Download or read book Spin Current written by Sadamichi Maekawa and published by Oxford University Press. This book was released on 2017 with total page 541 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a new branch of physics and technology, called spin-electronics or spintronics, the flow of electrical charge (usual current) as well as the flow of electron spin, the so-called "spin current", are manipulated and controlled together. This book is intended to provide an introduction and guide to the new physics and applications of spin current.
Book Synopsis Origin of Perpendicular Magnetic Anisotropy in Co/Ni Multilayers and Their Use in STT-RAM by : Monika Arora
Download or read book Origin of Perpendicular Magnetic Anisotropy in Co/Ni Multilayers and Their Use in STT-RAM written by Monika Arora and published by . This book was released on 2017 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic properties of (111)-textured SAF/Cu/FL multilayer film structures were optimized by varying individual layer thickness and sputtering conditions. The SAF is a synthetic antiferromagnet consisting of Co/Ni multilayers coupled antiferromagnetically across a Ru spacer layer, and the FL is a free layer consisting of a single Co/Ni multilayer. The Co and Ni thicknesses were varied to obtain larger perpendicular magnetic anisotropy. The perpendicular magnetic anisotropy, saturation magnetization, damping and zero-frequency line broadening of the Co/Ni multilayers strongly depend on the number of bilayers. With increasing Cu seed-layer thickness, the texture of the Co/Ni multilayers improves while the grain size and film roughness increase. The increase in grain size results in the reduction of the direct exchange coupling between magnetic grains, which enhances the coercivity of the SAF and the FL. Experimentally measured coercivities of the SAF and FL are compared with calculations obtained from a coherent rotation model. The effect of the role of the Co/Cu interface in the magnetoresistance, is also discussed. Spin-transfer-torque induced switching is investigated in 200 nm diameter circularly shaped, perpendicular magnetized nanopillars. The SAF layer is used as a reference layer to minimize the dipolar field on the free layer. The use of Pt and Pd was avoided to lower the spin-orbit scattering in magnetic layers and intrinsic damping in the free layer, and therefore, reduce the critical current required for spin-transfer-torque switching. In zero magnetic field the critical current required to switch the free layer from the parallel to antiparallel (antiparallel to parallel) alignment is 5.2 mA (4.9 mA). Given the volume of the free layer, VFL = 1.01×10-22 m3, the switching efficiency, Ic/(VFL m0Hc), is 5.28×1020 A/Tm3, twice as efficient as any previously reported device with a similar structure. Variation in perpendicular magnetic anisotropy of (111) textured Au/N×[Co/Ni]/Au films as a function of number of bilayer repeats N is studied. The experimental measurements show that the perpendicular magnetic anisotropy of Co/Ni multilayers first increases with N for N ≤ 10 and then moderately decreases for N> 10. The model we propose reveals that the decrease of the anisotropy for N 10 is predominantly due to the reduction in the magnetoelastic and magnetocrystalline anisotropies. A moderate decrease in the perpendicular magnetic anisotropy for N 10 is due to the reduction in the magnetocrystalline and the surface anisotropies.
Book Synopsis Thermal Spin Transport Phenomena and Magnetic Procimity Effect in Pt/ferromagnet Bilayer Systems by : Panagiota Bougiatioti
Download or read book Thermal Spin Transport Phenomena and Magnetic Procimity Effect in Pt/ferromagnet Bilayer Systems written by Panagiota Bougiatioti and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thermal Spin Transport Phenomena and Magnetic Proximity Effect in Pt/ferromagnet Bilayer Systems. Spintronics and Spin Caloritronics by : Panagiota Bougiatioti
Download or read book Thermal Spin Transport Phenomena and Magnetic Proximity Effect in Pt/ferromagnet Bilayer Systems. Spintronics and Spin Caloritronics written by Panagiota Bougiatioti and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Atomistic Spin Dynamics by : Olle Eriksson
Download or read book Atomistic Spin Dynamics written by Olle Eriksson and published by Oxford University Press. This book was released on 2017 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several large experimental facilities that focus on detection and probing magnetization dynamics have been realized in Europe, USA and Japan. This book covers theoretical and practical aspects of the vibrant and emerging research field of magnetization dynamics.
Book Synopsis Handbook of Magnetism and Magnetic Materials by : Michael Coey
Download or read book Handbook of Magnetism and Magnetic Materials written by Michael Coey and published by Springer. This book was released on 2021-11-19 with total page 1679 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Spectroscopy of Complex Oxide Interfaces by : Claudia Cancellieri
Download or read book Spectroscopy of Complex Oxide Interfaces written by Claudia Cancellieri and published by Springer. This book was released on 2018-04-09 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes the most recent and compelling experimental results for complex oxide interfaces. The results of this book were obtained with the cutting-edge photoemission technique at highest energy resolution. Due to their fascinating properties for new-generation electronic devices and the challenge of investigating buried regions, the book chiefly focuses on complex oxide interfaces. The crucial feature of exploring buried interfaces is the use of soft X-ray angle-resolved photoemission spectroscopy (ARPES) operating on the energy range of a few hundred eV to increase the photoelectron mean free path, enabling the photons to penetrate through the top layers – in contrast to conventional ultraviolet (UV)-ARPES techniques. The results presented here, achieved by different research groups around the world, are summarized in a clearly structured way and discussed in comparison with other photoemission spectroscopy techniques and other oxide materials. They are complemented and supported by the most recent theoretical calculations as well as results of complementary experimental techniques including electron transport and inelastic resonant X-ray scattering.
Download or read book Oxide Electronics written by Asim K. Ray and published by John Wiley & Sons. This book was released on 2021-04-12 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: Oxide Electronics Multiple disciplines converge in this insightful exploration of complex metal oxides and their functions and properties Oxide Electronics delivers a broad and comprehensive exploration of complex metal oxides designed to meet the multidisciplinary needs of electrical and electronic engineers, physicists, and material scientists. The distinguished author eschews complex mathematics whenever possible and focuses on the physical and functional properties of metal oxides in each chapter. Each of the sixteen chapters featured within the book begins with an abstract and an introduction to the topic, clear explanations are presented with graphical illustrations and relevant equations throughout the book. Numerous supporting references are included, and each chapter is self-contained, making them perfect for use both as a reference and as study material. Readers will learn how and why the field of oxide electronics is a key area of research and exploitation in materials science, electrical engineering, and semiconductor physics. The book encompasses every application area where the functional and electronic properties of various genres of oxides are exploited. Readers will also learn from topics like: Thorough discussions of High-k gate oxide for silicon heterostructure MOSFET devices and semiconductor-dielectric interfaces An exploration of printable high-mobility transparent amorphous oxide semiconductors Treatments of graphene oxide electronics, magnetic oxides, ferroelectric oxides, and materials for spin electronics Examinations of the calcium aluminate binary compound, perovoksites for photovoltaics, and oxide 2Degs Analyses of various applications for oxide electronics, including data storage, microprocessors, biomedical devices, LCDs, photovoltaic cells, TFTs, and sensors Suitable for researchers in semiconductor technology or working in materials science, electrical engineering, and physics, Oxide Electronics will also earn a place in the libraries of private industry researchers like device engineers working on electronic applications of oxide electronics. Engineers working on photovoltaics, sensors, or consumer electronics will also benefit from this book.
