Data is of great importance to man and needs to be stored reliably such that it can be called upon and used at any time. Man has progressed over the years from relying on the brain as a data storage system to magnetic recording systems. Magnetic data storage consists of non-volatile memories (longitudinal or perpendicular recording media) where the information is stored. The perpendicular recording system has become the popular choice in recent times due to its ultra-high storage capacity. n this work we study magnetic thin film of Cobalt ferrite with in-plane and out-of-plane anisotropies as longitudinal and perpendicular media respectively. Different types of magnetic characterization were performed on the samples of interest through VSM and torque measurements. This study shows that films with perpendicular anisotropy are more magnetically stable than those with in-plane anisotropy due to their slow magnetic relaxation. The slow relaxation process is promoted through the demagnetizing field induced by the measurement geometry, which considerably reduces the irreversible magnetic susceptibility making perpendicular recording more suited for magnetic data storage. -- Abstract.

A timely text on the recent developments in data storage, from a materials perspective Ever-increasing amounts of data storage on hard disk have been made possible largely due to the immense technological advances in the field of data storage materials. Developments in Data Storage: Materials Perspective covers the recent progress and developments in recording technologies, including the emerging non-volatile memory, which could potentially become storage technologies of the future. Featuring contributions from experts around the globe, this book provides engineers and graduate students in materials science and electrical engineering a solid foundation for grasping the subject. The book begins with the basics of magnetism and recording technology, setting the stage for the following chapters on existing methods and related research topics. These chapters focus on perpendicular recording media to underscore the current trend of hard disk media; read sensors, with descriptions of their fundamental principles and challenges; and write head, which addresses the advanced concepts for writing data in magnetic recording. Two chapters are devoted to the highly challenging area in hard disk drives of tribology, which deals with reliability, corrosion, and wear-resistance of the head and media. Next, the book provides an overview of the emerging technologies, such as heat-assisted magnetic recording and bit-patterned media recording. Non-volatile memory has emerged as a promising alternative storage option for certain device applications; two chapters are dedicated to non-volatile memory technologies such as the phase-change and the magnetic random access memories. With a strong focus on the fundamentals along with an overview of research topics, Developments in Data Storage is an ideal reference for graduate students or beginners in the field of magnetic recording. It also serves as an invaluable reference for future storage technologies including non-volatile memories.

The energy cost associated with modern information technologies has been increasing exponentially over time, stimulating the search for alternative information storage and processing devices. Magnetic skyrmions are solitonic nanometer-scale quasiparticles whose unique topological properties can be thought of as that of a Mobius strip. Skyrmions are envisioned as information carriers in novel information processing and storage devices with low power consumption and high information density. As such, they could contribute to solving the energy challenge. In order to be used in applications, isolated skyrmions must be thermally stable at the scale of years. In this work, their stability is studied through two main approaches: the Kramers' method in the form of Langer's theory, and the forward flux sampling method. Good agreement is found between the two methods. We find that small skyrmions possess low internal energy barriers, but are stabilized by a large activation entropy. This is a direct consequence of the existence of stable modes of deformation of the skyrmion. Additionally, frustrated exchange that arises at some transition metal interfaces leads to new collapse paths in the form of the partial nucleation of the corresponding antiparticle, as merons and antimerons.

Today magnetic recording is still the leading technology for mass data storage. Its dominant role is being reinforced by the success of cloud computing, which requires storing and managing huge amounts of data on a multitude of servers. Nonetheless, the hard-disk storage industry is presently at a crossroads as the current magnetic recording techno

This issue documents the state of the field in magnetic thin film processing using electrochemical methods including film nucleation and growth, structure of deposits, stress and micromagnetics of films, thermal and magnetic annealing, electrochemical and electroless plating systems, etching, process chemistry, tool design, and process control.

The explosive increase in information and the miniaturization of electronic devices demand new recording technologies and materials that combine high density, fast response, long retention time and rewriting capability. As predicted, the current silicon-based computer circuits are reaching their physical limits. Further miniaturization of the electronic components and increase in data storage density are vital for the next generation of IT equipment such as ultra high-speed mobile computing, communication devices and sophisticated sensors. This original book presents a comprehensive introduction to the significant research achievements on high-density data storage from the aspects of recording mechanisms, materials and fabrication technologies, which are promising for overcoming the physical limits of current data storage systems. The book serves as an useful guide for the development of optimized materials, technologies and device structures for future information storage, and will lead readers to the fascinating world of information technology in the future.

L1 0 -ordered FePt thin films are a leading candidate for next-generation magnetic recording, such as bit-patterned media (BPM), heat-assisted magnetic recording (HAMR), and multilevel three-dimensional (ML3D) magnetic recording, because of their excellent material properties. Its high magnetocrystalline anisotropy of ~ 108 ergs/cm3 allows for grain sizes less than a few nanometers while maintaining good thermal stability. It also has been demonstrated that L1 0 -FePt can achieve coercivity greater than 10 Tesla. However, achieving the L1 0 -phase requires post-annealing and/or deposition at elevated substrate temperature. In this work, the magnetic and microstructural properties of FePt thin films were investigated and improved for the use in perpendicular magnetic recording. FePt thin films were then fabricated on pre-patterned substrates for the use in BPM, with a heat sink layer for the use in HAMR, and with two magnetic layers for the use in ML3D magnetic recording.

Magnetic and superconducting materials pervade every avenue of the technological world – from microelectronics and mass-data storage to medicine and heavy engineering. Both areas have experienced a recent revitalisation of interest due to the discovery of new materials, and the re-evaluation of a wide range of basic mechanisms and phenomena.This Concise Encyclopedia draws its material from the award-winning Encyclopedia of Materials and Engineering, and includes updates and revisions not available in the original set -- making it the ideal reference companion for materials scientists and engineers with an interest in magnetic and superconducting materials. - Contains in excess of 130 articles, taken from the award-winning Encyclopedia of Materials: Science and Technology, including ScienceDirect updates not available in the original set - Each article discusses one aspect of magnetic and superconducting materials and includes photographs, line drawings and tables to aid the understanding of the topic at hand - Cross-referencing guides readers to articles covering subjects of related interest

Proceedings of the NATO Advanced Study Institute, June 25-July 7, 2000, Rhodes, Greece

This volume reflects the huge breadth and diversity in research and the application of industrial and engineering chemistry and cheminformatics. The book presents cutting-edge research developments and new insights that emphasize the vibrancy of industrial and engineering chemistry and cheminformatics today. The first section of the book focuses on new insights in engineering chemistry while the second part looks at the promising future and novel approaches in chemical informatics, which has vast implications for industrial and pharmaceutical applications. Several chapters examine various industrial processes for emerging materials and determine practical use under a wide range of conditions, helping to establish what is needed to produce a new generation of materials.