Dimensionality crossover regimes due to microcrystalline anisotropy in the resistivity of granular Y1Ba2Cu3O7?y in weak magnetic fields at low temperature

1988 ◽  
Vol 69 (4) ◽  
pp. 435-441 ◽  
Author(s):  
Ch. Laurent ◽  
M. Laguesse ◽  
S. K. Patapis ◽  
H. W. Vanderschueren ◽  
G. V. Lecomte ◽  
...  
Keyword(s):  
Low Temperature ◽  
Magnetic Fields ◽  
Weak Magnetic Fields

Room Temperature Sample Scanning SQUID Microscope for Imaging the Magnetic Fields of Geological Specimens

2013 ◽  
Vol 475-476 ◽  
pp. 3-6 ◽  
Author(s):  
Qing Meng Wang ◽  
Hua Feng Qin ◽  
Qing Song Liu ◽  
Tao Song
Keyword(s):  
Magnetic Field ◽  
Low Temperature ◽  
Magnetic Fields ◽  
Liquid Helium ◽  
Quantum Interference ◽  
Three Dimensional ◽  
Input Circuit ◽  
Pickup Coil ◽  
Weak Magnetic Fields ◽  
Scanning Squid

A microscope to image weak magnetic fields using a low-temperature superconducting quantum interference device (SQUID) had developed with a liquid helium consumption rate of ~0.5L/hour. The gradient pickup coil is made by a low-temperature superconducting niobium wire with a diameter of 66 μm, which is coupled to the input circuit of the SQUID and is then enwound on the sapphire bobbin. Both of the pickup coil and the SQUID sensor are installed in a red copper cold finger, which is thermally anchored to the liquid helium evaporation platform in the vacuum space of the cryostat. To reduce the distance between the pickup coil and sample, a 100 μm thick sapphire window is nestled up to the bottom of the cryostat. A three-dimensional scanning stage platform with a 50 cm Teflon sample rack under the sapphire window had the precision of 10 μm. To test the fidelity of the new facility, the distribution of the magnetic field of basalt slice specimens was determined. Results show that the spatial resolution of the newly-designed facility is 500 μm with a gradient magnetic field sensitivity of 380fT. This opens new opportunities in examining the distribution of magnetic assemblages in samples, which bear great geological and geophysical information.

Tuning the Magnetic Alignment of Cellulose Nanocrystals from Perpendicular to Parallel Using Lepidocrocite Nanoparticles

2019 ◽  
Author(s):  
Valentina Guccini ◽  
Sugam Kumar ◽  
Yulia Trushkina ◽  
Gergely Nagy ◽  
Christina Schütz ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Cellulose Nanocrystals ◽  
Small Angle Neutron Scattering ◽  
Lower Amount ◽  
Magnetic Alignment ◽  
Polarized Optical Microscopy ◽  
Parallel Orientation ◽  
Weak Magnetic Fields

The magnetic alignment of cellulose nanocrystals (CNC) and lepidocrocite nanorods (LpN), pristine and in hybrid suspensions has been investigated using contrast-matched small-angle neutron scattering (SANS) under in situ magnetic fields (0 – 6.8 T) and polarized optical microscopy. The pristine CNC (diamagnetic) and pristine LpN (paramagnetic) align perpendicular and parallel to the direction of field, respectively. The alignment of both the nanoparticles in their hybrid suspensions depends on the relative amount of the two components (CNC and LpN) and strength of the applied magnetic field. In the presence of 10 wt% LpN and fields < 1.0 T, the CNC align parallel to the field. In the hybrid containing lower amount of LpN (1 wt%), the ordering of CNC is partially frustrated in all range of magnetic field. At the same time, the LpN shows both perpendicular and parallel orientation, in the presence of CNC. This study highlights that the natural perpendicular ordering of CNC can be switched to parallel by weak magnetic fields and the incorporation of paramagnetic nanoparticle as LpN, as well it gives a method to influence the orientation of LpN.<br>

scholarly journals Sensitivity of PS/CoPd Janus particles to an external magnetic field

RSC Advances ◽  
2021 ◽  
Vol 11 (28) ◽  
pp. 17051-17057
Author(s):  
Anna Eichler-Volf ◽  
Yara Alsaadawi ◽  
Fernando Vazquez Luna ◽  
Qaiser Ali Khan ◽  
Simon Stierle ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
External Magnetic Field ◽  
Magnetic Fields ◽  
Janus Particles ◽  
Weak Magnetic Fields

PS/CoPd Janus particles respond very sensitively to application of low external magnetic fields. Owing to the magnetic properties, the PS/CoPd particles may be used, for example, to sense the presence of weak magnetic fields as micro-magnetometers.

Off-diagonal magnetoimpedance in amorphous wires and its application in miniature sensors of weak magnetic fields

2014 ◽  
Vol 78 (11) ◽  
pp. 1169-1173 ◽  
Author(s):  
N. A. Yudanov ◽  
A. A. Rudyonok ◽  
L. V. Panina ◽  
A. T. Morchenko ◽  
A. V. Kolesnikov ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Amorphous Wires ◽  
Weak Magnetic Fields

Magnetic Anisotropy in Single Crystals of Zn–Mn and Zn–Cr

1974 ◽  
Vol 52 (18) ◽  
pp. 1759-1764 ◽  
Author(s):  
F. T. Hedgcock ◽  
S. Lenis ◽  
P. L. Li ◽  
J. O. Ström-Olsen ◽  
E. F. Wassermann
Keyword(s):  
Low Temperature ◽  
Magnetic Fields ◽  
Magnetic Anisotropy ◽  
Single Crystals ◽  
Crystal Field ◽  
Interaction Effects ◽  
Crystal Field Splitting ◽  
High Magnetic Fields ◽  
Field Splitting ◽  
Chromium Ion

We have extended the low temperature magnetic anisotropy measurements on single crystals of zinc containing up to 600 p.p.m. manganese from magnetic fields of 9 to 56 kG. The crystal field splitting parameters determined at low magnetic fields also characterizes the magnetic anisotropy at high magnetic fields. Manganese–manganese interaction effects are observed in the magnetic anisotropy at manganese concentrations greater than 300 p.p.m. Low temperature magnetic anisotropy measurements on single crystals of zinc containing up to 164 p.p.m. chromium are reported and indicate a crystal field splitting of 0.16 K for the chromium ion.

Quantum mechanical aspects of the effects of weak magnetic fields on biological objects

BIOPHYSICS ◽  
2010 ◽  
Vol 55 (4) ◽  
pp. 652-660 ◽  
Author(s):  
A. V. Drozdov ◽  
T. P. Nagorskaya ◽  
S. V. Masyukevich ◽  
E. S. Gorshkov
Keyword(s):  
Magnetic Fields ◽  
Quantum Mechanical ◽  
Biological Objects ◽  
Weak Magnetic Fields

Effects of weak magnetic fields on free radical recombination reactions

1998 ◽  
Vol 95 (1) ◽  
pp. 71-89 ◽  
Author(s):  
C.R. Timmel ◽  
U. Till ◽  
B. Brocklehurst ◽  
K.A. Mclauchlan ◽  
P.J. Hore
Keyword(s):  
Free Radical ◽  
Magnetic Fields ◽  
Radical Recombination ◽  
Weak Magnetic Fields ◽  
Recombination Reactions
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