Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 12 of 12 for “"magnetic orientation"”.
-
Magnetic orientation in migratory birds
Wie nehmen Zugvögel das Magnetfeld wahr und wie nutzen sie diese Information, um sich zur Zugzeit zu orientieren? Das sind die Schlüsselfragen meiner Doktorarbeit. Cryptochrome werden als potentielle Magnetfeld-Rezeptoren vorgeschlagen. Ich konnte vier Cryptochrom-Varianten in der Retina von …
-
The Mouse Magnetic Compass
All five classes of vertebrates use the geomagnetic field for spatial orientation. The geomagnetic field can be used to derive both 'map' and 'compass' information. There is evidence for two different mechanisms used to sense the magnetic field, the radical pair mechanism (RPM) and the magnetite …
-
Magnetisation reversal in permanent magnet materials
… mechanism appears to depend on the initial magnetic state of the material. In the melt-spun Nd-Fe-B and in Sm-(Co,Cu,Fe,Zr) 2:17 powders, it is suggested that since domains remain correlated across several grains, the reversal mechanism is best described as bulk pinning of domain walls by …
-
Characterizing the Role of Magnetic Cues Underlying Spatial Behavior
In the 50+ years since the discovery of magnetic compass orientation by migratory songbirds, evidence for the use of magnetic cues has been obtained for a range of taxonomic groups, including several classes of vertebrate and invertebrate taxa. Surprisingly, however, the biophysical mechanisms and …
-
Harnessing Magnetic Switching and Dynamics Using Electron and Magnon Spin Currents
… information require effective control of the magnetic orientation and dynamics in magnetic materials, which can be realized by the interactions between magnetic moments and spin currents. In this thesis, we explore two types ofspin currents, as carried by conduction electrons and magnons, …
-
Quantum magnetic imaging for DNA biophysical measurements
… modality is developed that relies on ferro- magnetic probes of bio-mechanical orientation. Because a ferromagnet has an unchanging magnetic moment, imaging the re-orientation of a ferromagnetic probe attached to a single- molecule bio-mechanical system can directly provide information about …
-
Behavioral Investigation of the Light-Dependent Magnetoreception Mechanism of Drosophila melanogaster
Use of a magnetic compass has been demonstrated in all major classes of vertebrates as well as several classes of invertebrates, and is proposed to involve a photo-induced radical pair mechanism (RPM). My dissertation research consisted of characterizing a magnetic compass in a model species, …
-
Automatic prediction of solar flares and super geomagnetic storms
… on space system, satellite-based services. A geomagnetic storm, a disturbance in Earth's magnetosphere, may produce many harmful effects on Earth. Solar flares and Coronal Mass Ejections (CMEs) are believed to be the major causes of geomagnetic storms. Thus, establishing a real time forecasting …
-
Pattern formation and magnetism in pulsed laser-induced self-organized nanostructures from single and bilayer metallic films
… these resulting structures are related to their magnetic, optical, plasmonic, and magneto-optical properties, such as in high density magnetic storage, energy harvesting, and sensing. In this dissertation experimental and theoretical mechanisms of nanoscale patterning by dewetting …
-
Nanostructured magnetic materials for integrated magnonic devices
… coupled (EC) nanoheterostructures and their magnetic properties. Current challenges in the field of magnetics include the development of materials that demonstrate tunable magnetic properties, particularly in terms of controlling anisotropy and spin dynamics at the nanoscale. This thesis …
-
Cobalt-based Heusler compounds in magnetic tunnel junctions
… years due to possible new applications, e.g., a magnetic random access memory (MRAM), logic and sensors. The spin of the electrons is used as an additional degree of freedom in contrast to common electronic devices. The main constituent of many spintronic devices is the magnetic tunnel junction …
-
Spontaneous directional preferences in taxonomically and ecologically distinct organisms: examining cues and underlying mechanisms
The focus of this research was the spontaneous magnetic alignment responses of animals. We show that snapping turtles (Chelydra serpentina) and crayfish (Cambarus sciotensis) spontaneously align their body axes relative to the magnetic field. In snapping turtles, this response is sensitive to …