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.
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Showing 1 to 13 of 13 for “"magnetic noise"”.
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Magnetic noise studies in advanced metal particle tapes
… assembly of magnetisation profiles and noise studies on flexible media. Magnetic profiles of the media were established using anhysteretic techniques derived from Alternating Current (AC) bias analogue recording. The intention of this investigation was to establish processes that could …
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Dynamics of frustrated magnetic systems – Emergent fractals and anomalous magnetic noise in spin ice
… to the suppression of conventional long-ranged magnetic ordering, through a mechanism known as frustration. One of the typical features is the appearance of a large number of degenerate (or nearly degenerate) minimal energy states, that can exhibit topological order. The dynamical properties of …
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Magnetic fields near microstructured surfaces : application to atom chips
… processing, and studies of many-body systems. Magnetic trapping potentials with arbitrary geommetries are generated with atom chip by miniaturized current-carrying conductors integrated on a solid substrate. Atoms can be trapped and cooled to microKelvin and even nanoKelvin temperatures in such …
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Magnetometry with ensembles of nitrogen vacancy centers in bulk diamond
… orientation was developed to map vector magnetic field readings in the diamond reference frame to the lab frame. Preliminary vector field measurements and differential vector measurements were performed. Although these showed promising results, significant instrument and ambient magnetic …
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Noise detection and transport measurements of spin valve systems.
Electronic noise not only limits the performance of magnetic devices in practical applications but also provides valuable physical insights into these devices. The first part of this thesis discusses how the low frequency noise in magnetic tunnel junctions and giant magnetoresistance devices can be …
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Magnetocardiography in unshielded environment based on optical magnetometry and adaptive noise cancellation
… quantum magnetometers and an adaptive noise cancellation for heart magnetic field measurement within a magnetically-unshielded environment. Optically-pumped quantum magnetometers are based on the use of the atomic-spin-dependent optical properties of an atomic medium. An …
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Investigation of the tunneling emitter bipolar transistor as spin-injector into silicon
… measurement technique to probe bias dependent magnetic noise in magnetic tunnel junctions is proposed. Also, an IV fitting program that can extract the relative importance of the tunnel and Schottky barrier is discussed and employed to fit the base-emitter IV characteristics of the transistor. …
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Digital noise reconstruction with a quantum sensor
… Thus, probing and characterizing environmental noise is an essential task for both fundamental physics and quantum applications. Existing noise reconstruction methods in quantum systems rely on using approximated delta-like frequency filtering to sample the noise spectrum in frequency domain …
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High-fidelity microwave control of single-atom spin qubits in silicon
… single-spin coherence of 30 s. We have performed noise spectroscopy in our system and concluded that decoherence is currently limited by magnetic noise originating from our broadband antenna. We also describe a methodology towards the demonstration of electron-nuclear entanglement in a single …
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Exploring quantum geometry and quantum sensing with spin defects in diamond
… to detect various signals, ranging from electromagnetic fields to temperature, with high sensitivity and spatial resolution. Detecting biological or chemical signals is more challenging, but a promising avenue is to transduce them into magnetic noise that the NV center is sensitive to. We …
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Optical and spin coherence properties of Rb atoms in solid neon for magnetic field sensing
… emerged in solid-state electron spin systems for magnetic field sensing and imaging with nanoscale spatial resolution. The goal is to detect and resolve a single nuclear spin. A significant application for such a spatial resolution is the imaging of complex biological molecules. Nitrogen-vacancy …
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Fabrication of reliable, self-biased and nonlinear magnetoelectric composites and their applications
… field (E) or a polarization by an applied magnetic field (H), is of great interest to researchers due to its potential applications in magnetic sensors. Moreover, the ME effect in laminate composites is known to be much higher than in single phase and particulate composites due to …
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Dünnschichtsysteme für den Einsatz in magnetischen Tunnelstrukturen
… in the preparation and characterization of magnetic multilayer systems. The possibility of information storage based on magnetic properties exhibits a large application potential in mass storage devices. Especially the discovery of the GMR (giant magnetoresistance) has opened a large field …