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DOI: 10.5445/IR/1000073936#verlagsausgabe

Magnetic Lenz lenses improve the limit-of-detection in nuclear magnetic resonance

Spengler, N.; While, P. T.; Meissner, M. V.; Wallrabe, U.; Korvink, J. G.

A high NMR detection sensitivity is indispensable when dealing with mass and volume-limited
samples, or whenever a high spatial resolution is required. The use of miniaturised RF
coils is a proven way to increase sensitivity, but situations may arise where space restrictions
could prevent the use of a small resonant coil, e.g., in the interior of the smallest practicable
micro-coils. We present the use of magnetic lenses, denoted as Lenz lenses due to
their working principle, to focus the magnetic flux of an RF coil into a smaller volume and
thereby locally enhance the sensitivity of the NMR experimentÐat the expense of the total
sensitive volume. Besides focusing, such lenses facilitate re-guiding or re-shaping of magnetic
fields much like optical lenses do with light beams. For the first time we experimentally
demonstrate the use of Lenz lenses in magnetic resonance and provide a compact mathematical
description of the working principle. Through simulations we show that optimal
arrangements can be found.

Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator ISSN: 1932-6203
URN: urn:nbn:de:swb:90-739364
KITopen ID: 1000073936
Erschienen in PLoS one
Band 12
Heft 8
Seiten Art. Nr.: e0182779
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