High homogeneity permanent magnet for diamond magnetometry

Wickenbrock, Arne; Chatzidrosos, Georgios; Rebeirro, Joseph Shaji; Schneemann, Tim; Blümler, Peter

doi:10.1016/j.jmr.2020.106867

Cited by 10 publications

(2 citation statements)

References 26 publications

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“…It can be advantageous to replace the cylindrical segments of Figure A2b by N identical magnets with a polygonal, round, or trapezoidal footprint (as shown for squares in Figure A2c). This arrangement is also named Mandhalas [54] and densely packed geometries for differently shaped sub-pieces are discussed in [55]. The main advantage of using identically magnetized sub-pieces is to determine their individual strength (remanence), sort, and orient them to optimize the homogeneity of the resulting magnet [56][57][58].…”

Section: Appendix a Magnetic Forcementioning

confidence: 99%

Magnetic Guiding with Permanent Magnets: Concept, Realization and Applications to Nanoparticles and Cells

Blümler

2021

Cells

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The idea of remote magnetic guiding is developed from the underlying physics of a concept that allows for bijective force generation over the inner volume of magnet systems. This concept can equally be implemented by electro- or permanent magnets. Here, permanent magnets are in the focus because they offer many advantages. The equations of magnetic fields and forces as well as velocities are derived in detail and physical limits are discussed. The special hydrodynamics of nanoparticle dispersions under these circumstances is reviewed and related to technical constraints. The possibility of 3D guiding and magnetic imaging techniques are discussed. Finally, the first results in guiding macroscopic objects, superparamagnetic nanoparticles, and cells with incorporated nanoparticles are presented. The constructed magnet systems allow for orientation, movement, and acceleration of magnetic objects and, in principle, can be scaled up to human size.

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Section: Appendix a Magnetic Forcementioning

confidence: 99%

Magnetic Guiding with Permanent Magnets: Concept, Realization and Applications to Nanoparticles and Cells

Blümler

2021

Cells

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“…The temperature stability of any magnets employed will also be an important factor in this regard. Halbach arrays of rare-earth permanent magnets have been shown to provide fields of this magnitude with a high degree of homogeneity, 52 but variance in the properties of permanent magnets necessitates careful shimming of the magnet arrays. There is also the issue of sensitivity to extrinsic and intrinsic sources of magnetic noise, which could explain the observed instability of the emission line for zero spin-cavity detuning.…”

Section: Review Of Room-temperature Masersmentioning

confidence: 99%

Perspective on room-temperature solid-state masers

Arroo

Alford

Breeze

2021

Applied Physics Letters

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The first solid-state masers to operate at room-temperature and ambient air-pressure were recently demonstrated using optically pumped spin-triplet states as the gain medium. In this Perspective, we briefly review the previous state-of-the-art in cryogenic solid-state masers and then discuss the development of the room-temperature solid-state maser: from the organic pentacene pulsed maser to the diamond nitrogenvacancy continuous-wave maser. We characterize the operation of these masers as coherent microwave sources and ultra-low noise amplifiers before outlining how they can be adapted to act as model systems in which to explore room-temperature cavity quantum electrodynamics. After discussing challenges facing current embodiments of the room-temperature solid-state maser, we explore how they might be addressed or by-passed altogether through the development of alternative materials and masing mechanisms. Finally, we speculate on how the advent of masers that can operate in ambient conditions might lead to novel applications in metrology and quantum technologies.

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Practical Concepts for Design, Construction and Application of Halbach Magnets in Magnetic Resonance

Blümler,

Soltner

2023

Appl Magn Reson

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This review is a compilation of relevant concepts in designing Halbach multipoles for magnetic resonance applications. The main focus is on providing practical guidelines to plan, design and build such magnets. Therefore, analytical equations are presented for estimating the magnetic field from ideal to realistic systems. Various strategies of homogenizing magnetic fields are discussed together with concepts of opening such magnets without force or combining them for variable fields. Temperature compensation and other practical aspects are also reviewed. For magnetic resonance two polarities (di- and quadrupole) are of main interest, but higher polarities are also included.

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High homogeneity permanent magnet for diamond magnetometry

Cited by 10 publications

References 26 publications

Magnetic Guiding with Permanent Magnets: Concept, Realization and Applications to Nanoparticles and Cells

Magnetic Guiding with Permanent Magnets: Concept, Realization and Applications to Nanoparticles and Cells

Perspective on room-temperature solid-state masers

Practical Concepts for Design, Construction and Application of Halbach Magnets in Magnetic Resonance

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