Science and Technology of Nanostructured Magnetic Materials

ISBN-13: 9780306439247 / Angielski / Twarda / 1991 / 720 str.

G. C. Hadjipanayis; Gary A. Prinz; George C. Hadjipanayis

Opis

of progress has been made in the development of In the last twenty years a great amount new magnetic materials. Permanent magnets have progressed from the AlNiCo's (with (BH)m-8 MGOe) to the strong rare-earth magnets of SmCo BH)m-20 MGOe), Sm2(Co, Fe, Cu, Zrh7 s BH)m-30 MGOe) and the recently discovered Nd-Fe-B super-magnets with (BH)m-50 MGOe. For years the magnetic storage industry has employed Fe0 and CrO for storage media and 2 3 z permalloys and ferrites for recording heads. The recent development of thin film heads, the demand of higher density of information storage and the emergence of completely new technologies, like magneto-optics, call for entirely new types of magnetic materials. Another area in which new techniques of materials preparation have made a dramatic impact is the epitaxial growth of magnetic films. Recent work has shown that this process can be controlled on the scale of atomic monolayers permitting the growth of totally artificial structures, such as artificial superlattices with a resolution on this scale. Epitaxial growth has also permitted the stabilization of metastable phases in thin film form. These new phases often possess striking properties, such as strong perpendicular anisotropies, which may prove useful for technological applications such as recording. Research on magnetic multilayers and superlattices is increasing at an accelerating pace. Complex couplings between different magnetic layers lead to new properties not seen in bulk materials.

Spis treści

Thin Films, Surfaces and Interfaces.- Electronic Structure and Magnetism of Metal Surfaces, Overlayers and Interfaces.- Growth and Magnetic Properties of Metastable Structures.- Spin-Resolved Photoemission.- Correlation of Crystalline and Electronic Structure in Epitaxial FCC-Cobalt Monolayers on Cu(100).- Hybrid Ferromagnetic/Semiconductor Structures.- Mössbauer Studies of Ultrathin Magnetic Films of Fe/Ag(100).- Spin-Dependence of Absorbed and Reflected Current on Fe(110).- MBE Growth of Metal/Semiconductor Interfaces.- Surface and Interface Magnetism.- Ferromagnetic Resonance Studies of BCC Epitaxial Ultrathin Fe(001)/Cu(001) Bilayers and Fe(001)/Cu(001)/Fe(001) Trilayers.- Laser Ablation Deposition of Metallic Thin Films.- Exchange Coupled Films for Magneto-Optic Applications.- Temperature Dependence of Micromagnetic Domain Structure in Cobalt Films.- Hyperfine Interaction Techniques Applied to the Study of Surfaces and Interfaces.- Surface Magnetostriction.- Multilayers.- Magnetic Rare Earth Artificial Metallic Superlattices.- X-Ray Characterization of Magnetic Multilayers and Superlattices.- The Characterization of Interface Roughness and Other Defects in Multilayers by X-Ray Scattering.- Magnetism of Nanostructured Rare Earth Multilayers.- FMR Studies of Metallic Magnetic Thin Films in Layered Structures.- Compositionally Modulated Magnetic Multilayers: Temperature- and Modulation-Dependent Properties.- Structural and Magnetic Properties of Epitaxial Co/Pd Superlattices.- First-Principles Calculation of the Magnetocrystalline Anisotropy Energy of ConPdm Multilayers.- Structural and Magnetic Studies in Co-Pt Multilayers.- Magnetic Properties of Hexagonal Fe/Ru Superlattices With Short Periodicity.- Magnetic Studies of Fe-Si Compositionally Modulated Thin Films.- Mössbauer Spectroscopy of the Fe/Ni Interface.- Analysis of Amorphous Dysprosium-Transition Metal Nanoscale Magnetic Multilayers.- Transport Properties of Thin Metallic Films and Multilayers.- Domain Walls, Magnetic Domains And Techniques For Their Observation.- Micromagnetics of Longitudinal Recording Media.- MO-Recording: The Switching Process and Its Relation to the Magnetic Properties of Thin Films.- Micromagnetic Computations of Magnetization Configurations.- Domain Walls and Wall Structure.- Domain Wall Multiplication in Amorphous Ferromagnetic Alloys.- Electron Microscope Methods for Imaging Internal Magnetic Fields at High Spatial Resolution.- Scanning Tunneling Microscopy and Force Microscopy Applied to Magnetic Materials.- Special Session on Spin-Polarized Vacuum Tunneling.- Magnetic Imaging Via Scanning Electron Microscopy with Polarization Analysis.- Atomic Scale Probe into High-Tc Superconductors Using Scanning Tunnelling Microscopy.- Magnetic Anisotropy and Random Magnets.- Magnetic Anisotropy.- Random Anisotropy in Magnetic Materials.- Perpendicular and In-Plane Anisotropy in Amorphous Tb-Fe.- Magnetostriction in Amorphous Ferromagnets.- Anderson Localization in 3-Dimensional Amorphous Alloys: Evolution with the Content of Magnetic Ions.- On the Law of Approach to Saturation in the Series of Amorphous Alloys a-Dyxd1?xNi.- Magnetoresistance of Amorphous U1?xSbx Films.- Absence of Temperature-Driven First-Order Phase Transitions in Systems with Random Bonds.- Magnetic Semiconductors and Intermetallic Compounds.- Magnetic Behavior of Diluted Magnetic Semiconductors.- Intermetallic Compounds and Crystal Field Interactions.- Crystal-Field and Exchange Interactions in Hard Magnetic Materials.- First Order Magnetization Processes.- Structure and Properties of Novel Ternary Fe-Rich Rare-Earth Carbides.- Fine Particles.- Granular Solids.- Ultrafine Magnetic Particles.- Magnetic Nanometer Systems and Mössbauer Spectroscopy.- Some Topics in Fine Particle Magnetism.- Mössbauer Studies of Fine Fe-Based Particles.- Mössbauer Studies of Fine Particles of Fe-Cr-B.- Chemical Preparation of Amorphous Fe-Cr-B Particles.- Composition and Structure of Fe-Ni-B Alloy Particles Prepared by Chemical Reduction with NaBH4.- Quantum Effects in Ultrafine Nd-Fe-B Particles.- Magnetization Reversal in Clusters of Magnetic Particles.- Electric and Magnetic Properties of Small Systems.- Existence of Frequency Cut-Off in the Spin Wave Spectrum of Small Magnetic Particles.- Magnetic Hysteresis and Permanent Magnets.- Mechanically Alloyed Permanent Magnets.- Melt-Spun Magnets.- Solid NdFeB Magnets Made by Gas Atomization and Extrusion.- The Role of Microstructure in Permanent Magnets.- Lorentz Microscopy Studies in Permanent Magnets.- Coercivity in Hard Magnetic Materials.- Micromagnetism and Magnetization Processes in Modern Magnetic Materials.- Micromagnetic Approach to Magnetic Hysteresis.- Magnetic Hysteresis in Disordered Magnets.- Coercivity of Nanostructured Materials.- Magnetic Hysteresis of CoPt Films.- Technology and Applications of Permanent Magnets.- Author Index.