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Measurement of magnetic susceptibility in pulsed magnetic fields using a proximity detector oscillator
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10.1063/1.3653395
/content/aip/journal/rsi/82/11/10.1063/1.3653395
http://aip.metastore.ingenta.com/content/aip/journal/rsi/82/11/10.1063/1.3653395

Figures

Image of FIG. 1.
FIG. 1.

Schematic diagram of the cryostat and PDODS probe design.

Image of FIG. 2.
FIG. 2.

Schematic diagram of the PDODS system, modified from Altarawneh, Mielke, and Brooks.22 L 0 is the sensor coil inductance, which is then coupled to the proximity detector chip through inductances L 1 and L 2. C and R represent capacitors and resistors, respectively. L 2 = L 1 ≃ 0.45 μH.

Image of FIG. 3.
FIG. 3.

Relative shift in resonant frequency at 4.2 K when using coils made with: 8 turns of 75 μm copper or 100 μm aluminum wire. Also plotted are least-squares fits using Eq. (13). Inset: time profile of a typical field pulse.

Image of FIG. 4.
FIG. 4.

(a) PDODS frequency shifts for the sample Cu(H2O)5(VOF4)(H2O) at various temperatures. Some smoothing has been performed to reduce high frequency noise. (b) PDODS frequency shift with the background and the a χ0 constant removed. (c) Data from the extraction susceptometer.

Image of FIG. 5.
FIG. 5.

Comparison of the deduced magnetization from the PDODS and the extraction susceptometer data, for Cu(H2O)5(VOF4)(H2O) at 4 K and 20 K.

Image of FIG. 6.
FIG. 6.

Magnetization of the metal-organic coordination polymer40 [Cu(HF2)(pyz)2]BF4 at 1.5 K, using the PDODS and the extraction susceptometer. Inset: relative change in the PDODS resonant frequency during the pulse.

Tables

Generic image for table
Table I.

Parameters from least-square fits of Eq. (13) to the frequency response of empty copper and aluminum coils.

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/content/aip/journal/rsi/82/11/10.1063/1.3653395
2011-11-11
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Measurement of magnetic susceptibility in pulsed magnetic fields using a proximity detector oscillator
http://aip.metastore.ingenta.com/content/aip/journal/rsi/82/11/10.1063/1.3653395
10.1063/1.3653395
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