Investigation of the Magnetic Switching Behavior for the Thin Film Permalloy Deposited Over a Monolayer of Nano/microspheres PDF Download

Author: Zachary Minaker (Graduate student)
Publisher:
ISBN:
Category : Microspheres
Languages : en
Pages : 74

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Book Description
Abstract: A curved surface and nanoscale structure can add to a thin film of magnetic material to produce interesting magnetic properties not shown in normal flat magnetic thin film. In this work, how magnetic properties of permalloy magnetic thin films deposited on the curved surface change from its dependence on several parameters was studied. The structured curvature was introduced by means of nanocapping a close-packed monolayer of nanospheres. Three different sizes, 400 nm, 1 [mu]m, and 10 [mu]m diameter nanospheres were used to produce monolayer templates. Focus was turned to the 10 m templates, since the fabrication of that template most consistently produced the more uniform monolayer and quickest to deposit. The primary goal of this study is to investigate how varying the thickness of permalloy from 10 nm to 80 nm changes the magnetic switching behavior. By Alternating Gradient Magnetometry, we study how the coercivity of magnetic hysteresis depends on the thickness of the structured permalloy thin film. Results reveal, when compared to flat permalloy thin films, the curved geometry of the monolayer structure significantly alters the coercivity of the thin film. The magnetic switching behavior of permalloy nanocaps contains both interesting linear and non-linear dependencies with respect to the film thickness.

Author: Farzad Nasirpouri
Publisher: World Scientific
ISBN: 9814273058
Category : Science
Languages : en
Pages : 401

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Book Description
Nanomagnetism and spintronics are two close subfields of nanoscience, explaining the effect of substantial magnetic properties of matter when the materials fabrication is realized at a comparable length size. Nanomagnetism deals with the magnetic phenomena specific to the structures having dimensions in the submicron range. The fact that the electronic transport properties of materials are dependent on the magnetic properties' artificial nanostructures, i.e., giant magnetoresistance (GMR) or tunneling magnetoresistance (TMR), has revolutionized spintronics science and technology. This book explains the concepts of nanomagnetism and spintronics by viewing the most recent research works from internationally distinguished research groups. Placing special emphasis on crucial fundamental and technical aspects of nanomagnetism and spintronics, it serves as a one-stop reference for universities offering postgraduate programs in nanotechnology or related disciplines. This unique book deals with all three stages required for conducting research in nanomagnetism and spintronics including fabrication, characterization and applications of nanomagnetic and spintronics materials, providing general concepts and an insightful overview of this subject for research students and scientists from different backgrounds investigating the multidisciplinary area of nanotechnology.

Author: Ivan Nedkov
Publisher: Springer Science & Business Media
ISBN: 9780792358725
Category : Science
Languages : en
Pages : 416

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Book Description
Proceedings of the NATO Advanced Research Workshop on Ferrimagnetic Nano-crystalline and Thin Film Magnetooptical and Microwave Materials, Sozopol, Bulgaria, 27 September - 3 October, 1998

Author: Farzad Nasirpouri
Publisher: World Scientific
ISBN: 9814468029
Category : Science
Languages : en
Pages : 401

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Book Description
Spintronics manipulates individual magnetic moments to integrate logic functions and non-volatile information storage on the same platform. As is often the case in condensed matter science, advances are made through the synthesis of novel materials and high quality new physics materials. Giant magnetoresistance and dilute magnetic semiconductors are two such examples. However, the remarkable potential of spintronics for quantum computation faces major challenges when it comes to controlling simultaneously several qbits encoded in magnetic moments.After a brief introduction to concepts in nanomagnetism and spintronics, the text reviews recent techniques and their achievements in the synthesis and fabrication of magnetic nanostructures. The methods presented here emphasize bottom up or top down approaches for nanodots, nanowires and thin films. They include: focused ion beam irradiation, electron beam-induced chemical vapour deposition, chemical, and electrochemical methods. The later part of the book reviews magnetoelectric materials, the giant magnetoresistance in magnetic superlattices, dynamics effects in spin transfer torque oscillators, dilute magnetic oxides, rare earth nitrides with nuclear resonance scattering, and Mössbauer spectroscopy in spintronics. Finally, the last part of this book discusses applications to magnetic storage and bio-magnetism.Nanomagnetism and Spintronics will be useful to graduate students and researchers and engineers in the field of nanoscience.

Author: Wenming Ju
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
Nano-scale magnetic patterned structures and thin films have attracted attention over the past few years due to their unique magnetization distribution and promising application in nonvolatile data storage, magnetic field sensors and spintronic devices. Magnetization states and their switching processes are fundamental investigation subjects of such magnetic systems. This dissertation discusses experimental work and theoretical analysis on investigating the magnetization of these nano-scale magnetic structures and how we can characterize and manipulate the magnetization in order to realize industrial application. The efforts done in this dissertation can be grouped into three topics: First, we focus on whether we can reverse the vortex circulation of the ferromagnetic nanodisk without breaking its symmetry so as to control and manipulate the chirality of the nanodisk. The vortex state of ferromagnetic nanodisk is characterized with and without in-plane magnetic field. The vortex circulation switching is achieved by applying a local circular magnetic field which is created by passing current through an AFM tip that is in contact with the nanodisk. The experimental results indicate the success of the reversal when a dielectric breakdown happens during the current application and the breakdown voltage is above a threshold value. This implies that the concentration of the current in the center of the disk leads to a stronger magnetic field and lower switching current. The analysis is supported by the results of micromagnetic simulations conducted in this work. Second, a magnetometer based on Magneto-optical Kerr effect is constructed. It is then used to record the hysteresis loop of permalloy and cobalt amorphous thin films. At the same time the affect of skew angles in Magneto-optical Kerr effect is also investigated so that the skew angle that leads to highest Kerr signal can be determined. The setup lays a foundation which enables us to investigate the magnetic properties of various magnetic structures and develop other techniques for related study, so some future work related to interlayer exchange coupling of trilayer structure and Magneto-optical Kerr imaging are proposed. Last, the thermal diffusivity measurement of Co/Cu multilayer by laser flash technique is conducted with and without in-plane magnetic field. The experimental result shows that the application of magnetic field does not lead to a significant change in the thermal diffusivity of this structure. This phenomenon is interesting as it is different from the behavior of the electrical conductivity of this structure when magnetic field is applied (giant magnetoresistance effect). Some exploratory discussion is presented in the end.

Author: J.A.C. Bland
Publisher: Springer
ISBN: 9783540801771
Category : Technology & Engineering
Languages : en
Pages : 318

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Book Description
The ability to understand and control the unique properties of interfaces has created an entirely new field of magnetism which already has a profound impact in technology and is providing the basis for a revolution in electronics. The last decade has seen dramatic progress in the development of magnetic devices for information technology but also in the basic understanding of the physics of magnetic nanostructures. This volume describes thin film magnetic properties and methods for characterising thin film structure topics that underpin the present 'spintronics' revolution in which devices are based on combined magnetic materials and semiconductors. Volume IV deals with the fundamentals of spintronics: magnetoelectronic materials, spin injection and detection, micromagnetics and the development of magnetic random access memory based on GMR and tunnel junction devices. Together these books provide readers with a comprehensive account of an exciting and rapidly developing field. The treatment is designed to be accessible both to newcomers and to experts already working in this field who would like to get a better understanding of this very diversified area of research.

Author: Bruno Azzerboni
Publisher: Springer
ISBN: 1402063385
Category : Technology & Engineering
Languages : en
Pages : 356

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Book Description
In this book, a team of outstanding scientists in the field of modern magnetic nanotechnologies illustrates the state-of-the-art in several areas of advanced magneto-electronic devices, magnetic micro-electromechanical systems and high density information storage technologies. Providing a unique source of information for the young physicist, chemist or engineer, the book also serves as a crucial reference for the expert scientist and the teacher of advanced university courses.

Author: Claude Fermon
Publisher: John Wiley & Sons
ISBN: 3527699066
Category : Science
Languages : en
Pages : 376

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Book Description
This first book to focus on the applications of nanomagnetism presents those already realized while also suggesting bold ideas for further breakthroughs. The first part is devoted to the concept of spin electronics and its use for data storage and magnetic sensing, while the second part concentrates on magnetic nanoparticles and their use in industrial environment, biological and medical applications. The third, more prospective part goes on to describe emerging applications related to spin current creation and manipulation, dynamics, spin waves and binary logic based on nano-scale magnetism. With its unique choice of topics and authors, this will appeal to academic as well as corporate researchers in a wide range of disciplines from physics via materials science to engineering, chemistry and life science.

Author: D. L. Mills
Publisher: Elsevier Science Limited
ISBN: 9780444516800
Category : Science
Languages : en
Pages : 334

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Book Description
After a brief introduction by the editors, Wu first surveys the fundamental properties of magnetic nanostructures. The interlayer exchange interactions within magnetic multilayer structures is next discussed by Stiles. Camley then discusses the static, dynamic and thermal properties of magnetic multilayers and nanostructures, followed by an account of the phenomenon of exchange anisotropy by Berkowitz and Kodama. This latter phenomenon is widely in current read head devices for example. The transport properties of nanostructures also are spectacular, and again underpin computer technology, as we see from the discussion of giant magnetoresistance (GMR) and tunnelling magnetoresistance (TMR) presented by Fert and his colleagues. Beyond GMR and TMR we look to the field of spintronics where new electronic devices are envisioned and for which quantum computing may depend as discussed in the chapter by Flatte and Jonker.-

Author: Bretislav Heinrich
Publisher: Springer
ISBN: 9783540219545
Category : Technology & Engineering
Languages : en
Pages : 0

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Book Description
The ability to understand and control the unique properties of interfaces has created an entirely new field of magnetism which already has a profound impact in technology and is providing the basis for a revolution in electronics. The last decade has seen dramatic progress in the development of magnetic devices for information technology but also in the basic understanding of the physics of magnetic nanostructures. Volume III describes thin film magnetic properties and methods for characterising thin film structure topics that underpin the present 'spintronics' revolution in which devices are based on combined magnetic materials and semiconductors. The present volume (IV) deals with the fundamentals of spintronics: magnetoelectronic materials, spin injection and detection, micromagnetics and the development of magnetic random access memory based on GMR and tunnel junction devices. Together these books provide readers with a comprehensive account of an exciting and rapidly developing field. The treatment is designed to be accessible both to newcomers and to experts already working in this field who would like to get a better understanding of this very diversified area of research.