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銅蟲 (初入文壇)

應(yīng)助: 0 (幼兒園)
金幣: 71.7
帖子: 42
在線: 10.7小時
蟲號: 3052161
注冊: 2014-03-14
性別: GG
專業(yè): 基礎(chǔ)物理學(xué)

[求助] 物理論文翻譯求助

By means of the modification of an electron paramagnetic resonance (EPR) spectrometer, two experimental techniques have been implemented
to measure the magnetosensitive non-resonant absorption of microwaves (MANRAM): magnetically modulated microwave absorption
spectroscopy (MAMMAS) and low field non-resonant microwave absorption spectroscopy (LFNORMAS). These techniques are proposed
to be used in the characterization of magnetic materials at microwave frequencies. They are very sensitive, hence require very little amount
of material for test in the form of crystals, glasses, powders, liquids; these wireless techniques are non-destructive.
Magnetically modulated microwave absorption spectroscopy is carried out cooling or heating a sample under study in presence of a modulated
magnetic field. The temperature of the material is taken and a graph of it versus the modulated absorption of microwaves is constructed. Low
field non-resonant microwave absorption spectroscopy measures the magnetosensitive-modulated absorption of microwaves, by the material,
with respect to cycled sweepings of an applied dc magnetic field. We present results for the ceramic superconductor YBa2Cu3O7−x(YBCO),
the antiferromagnetic (AF) MnO oxide and ferroelectromagnetic Pb(Fe1/2Nb1/2)O3 (PFN). The absorption spectra are shown highlighting
their main characteristics.
The magnetosensitive non-resonant absorption of microwaves
(MANRAM) is a contactless, non-destructive, and
highly sensitive technique, that has been employed with success
in the study and characterization of superconductivity
[1,2]. Recent studies have shown that non-superconductor
materials also show MANRAM signals [3,4]. A microscopic
understanding of these microwave energy absorption
processes is slowly developing at present. In these materials,
this signal is said to be caused mainly by two sources:
(1) the interaction of the magnetic field with the magnetic
or electric dipoles in the material; and (2) the MANRAM
signal is caused by changes in the magnetoimpedance to
microwaves. The MANRAM response of a material is detected
as function of temperature or as a function of the
applied dc magnetic field. These two variants have been
denominated in superconductivity studies as magnetically
modulated microwave absorption spectroscopy (MAMMAS)
[1] and low field non-resonant microwave absorption
spectroscopy (LFNORMAS) [2], respectively.
In this work, we report the implementation of the
MAMMAS and LFNORMAS techniques within a single
equipment. Additionally, we present results for the
ceramic superconductor YBa2Cu3O7−x (YBCO), the antiferromagnetic
(AF) MnO oxide and ferroelectromagnetic
Pb(Fe1/2Nb1/2)O3 (PFN). The absorption spectra are shown
highlighting their main characteristics.

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禁蟲 (著名寫手)

愛與雨下: 2014-05-06 18:56:26
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