Magnetic imaging of static and dynamic states in systems of reduced dimensions
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Within this thesis, static and dynamic states in magnetic systems of reduced dimensions are investigated by means of the advanced magnetic imaging technique ``scanning electron microscopy with polarization analysis'' (SEMPA). After a short introductory overview of the historical development of storage media, its current status is described with a focus on random-access memory (RAM). The basic concepts of modern non-volatile storage devices based on magnetism are introduced and the physical mechanisms behind the phenomena that are used to manipulate and access the data are discussed.
Magnetic imaging is a powerful, yet illustrative tool to further explore the physics behind these mechanisms. Throughout this book SEMPA imaging is used to determine the parameters of spin-transfer torque from the current-induced vortex displacement in a permalloy square. A concept for the extension of the SEMPA technique into the nanosecond regime is discussed. Using this time-resolved SEMPA, the gyrotropic motion of a vortex core is observed as a first proof of concept.
In another project of this thesis, the interplay between ferromagnetic and ferroelectric domain walls is investigated. Two different types of walls are observed: charged walls and uncharged walls. The book concludes with a theoretical chapter in which the uniaxial anisotropy is derived that emerges when a magnetic film is prepared on top of a rippled substrate. The results are compared to experimental studies.
Magnetic imaging is a powerful, yet illustrative tool to further explore the physics behind these mechanisms. Throughout this book SEMPA imaging is used to determine the parameters of spin-transfer torque from the current-induced vortex displacement in a permalloy square. A concept for the extension of the SEMPA technique into the nanosecond regime is discussed. Using this time-resolved SEMPA, the gyrotropic motion of a vortex core is observed as a first proof of concept.
In another project of this thesis, the interplay between ferromagnetic and ferroelectric domain walls is investigated. Two different types of walls are observed: charged walls and uncharged walls. The book concludes with a theoretical chapter in which the uniaxial anisotropy is derived that emerges when a magnetic film is prepared on top of a rippled substrate. The results are compared to experimental studies.
| Erscheint lt. Verlag | 24.4.2015 |
|---|---|
| Reihe/Serie | Berichte aus der Physik |
| Verlagsort | Aachen |
| Sprache | englisch |
| Maße | 148 x 210 mm |
| Gewicht | 278 g |
| Einbandart | Paperback |
| Themenwelt | Naturwissenschaften ► Physik / Astronomie ► Elektrodynamik |
| Schlagworte | magnetic imaging • magnetic thin films • magnetic vortex cores • SEMPA • spin-transfer torque • time-resolved SEMPA |
| ISBN-10 | 3-8440-3523-0 / 3844035230 |
| ISBN-13 | 978-3-8440-3523-0 / 9783844035230 |
| Zustand | Neuware |
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