Development of a nano-tesla magnetic field shielded chamber and highly precise AC-susceptibility measurement coil at μK temperatures

2014 ◽  
Author(s):  
Anil Kumar ◽  
Om Prakash ◽  
S. Ramakrishanan
Keyword(s):  
Magnetic Field ◽  
Ac Susceptibility ◽  
Measurement Coil

scholarly journals Manganese/Yttrium Codoped Strontium Nanohexaferrites: Evaluation of Magnetic Susceptibility and Mossbauer Spectra

Nanomaterials ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 24 ◽  
Author(s):  
Munirah Almessiere ◽  
Yassine Slimani ◽  
Hakan Güngüneş ◽  
Abdulhadi Baykal ◽  
S.V. Trukhanov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Mössbauer Spectra ◽  
Ac Susceptibility ◽  
Sol Gel ◽  
Hyperfine Magnetic Field ◽  
Analytical Techniques ◽  
Magnetic Interactions ◽  
Mossbauer Spectra

Manganese (Mn)- and yttrium (Y)-substituted Sr-nanohexaferrites (MYSNHFs) of composition Sr1−xMnxFe12−xYxO19 (with 0.0 ≤ x ≤ 0.5) were prepared by citrate sol-gel autocombustion method. As-prepared MYSNHFs were characterized via diverse analytical techniques to determine the influence of Mn and Y cosubstitution on their microstructures and magnetic properties. 57Fe Mössbauer spectra of the MYSNHFs were used to evaluate the variation in the line width, isomer shift, quadrupole splitting, and hyperfine magnetic field values. It was shown that the dopant ions could preferentially occupy the 12k, 4f2, and 2b sites. Furthermore, the observed shift in the blocking temperatures of the studied MYSNHFs towards lower values with rising Mn2+ and Y3+ contents was attributed to the overall particles size reduction. Meanwhile, the AC susceptibility of the proposed MYSNHFs revealed that the magnetic interactions were weakened with the increase in dopant contents which was ascribed to the replacement of both Sr2+ and Fe3+ ions by the Mn2+ and Y3+ dopants.

Harmonic Analysis of the AC Magnetic Response on Directionally Solidified YBaCuO Samples

1999 ◽  
Vol 13 (09n10) ◽  
pp. 1101-1106 ◽  
Author(s):  
M. Polichetti ◽  
S. Pace ◽  
A. Vecchione
Keyword(s):  
Magnetic Field ◽  
Diffusion Processes ◽  
Ac Susceptibility ◽  
Magnetic Response ◽  
Experimental Conditions ◽  
Flux Dynamics ◽  
Flux Flow ◽  
Flux Lines ◽  
Flux Dynamic ◽  
Ac Response

The transport properties and the dynamics of the flux lines have been investigated on YBaCuO melt textured by measuring the AC susceptibility harmonics as function of the temperature, at different frequencies and amplitudes of the AC magnetic field. The interpretation of the behavior of the experimental curves has been done by their comparison with the results obtained by critical state pictures and by simulations of the diffusion processes of the magnetic field which determine the AC response in presence of different regimes of flux dynamics. The temperature dependencies of the third harmonics of the AC susceptibility at different frequencies have been used in particular to determine what is the flux dynamic regime governing the magnetic response of melt textured samples in the different experimental conditions. A good qualitative agreement has been found between the experimental curves and the ones simulated by assuming that dissipation processes are a sequence of independent flux creep and flux flow events within a collective pinning framework.

Magnetic-field dependence of the ac susceptibility in granularYBa2Cu3O7: Data and models

1991 ◽  
Vol 43 (13) ◽  
pp. 11404-11407 ◽  
Author(s):  
Youngtae Kim ◽  
Q. Harry Lam ◽  
C. D. Jeffries
Keyword(s):  
Magnetic Field ◽  
Field Dependence ◽  
Magnetic Field Dependence ◽  
Ac Susceptibility

STUDY OF STRUCTURAL, ELECTRICAL TRANSPORT AND MAGNETIC PROPERTIES IN La1-xAgxMnO3 COMPOUNDS

2004 ◽  
Vol 18 (05n06) ◽  
pp. 221-231 ◽  
Author(s):  
MANORANJAN KAR ◽  
S. RAVI
Keyword(s):  
Magnetic Field ◽  
Electrical Transport ◽  
Single Phase ◽  
Ac Susceptibility ◽  
X Ray Diffraction ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Phase Form ◽  
X Ray ◽  
Maximum Value

X-ray diffraction, electrical resistivity and ac susceptibility measurements have been carried out on La 1-x Ag x MnO 3 compounds for x=0.05 to 0.30. These samples are found to be in single phase form with [Formula: see text] space group and with typical lattice parameters a=b=5.524Å and c=13.349Å for x=0.05 sample. The Mn–O–Mn bond angles and variance, σ2 are found to increase with doping. Metal-insulator transitions in the temperature range 254 to 259 K have been observed. These materials exhibit paramagnetic to ferromagnetic transitions in the vicinity of metal-insulator transition temperatures. The paramagnetic susceptibility could be analyzed using Curie–Weiss law. All the above samples exhibit colossal magneto-resistivity and its maximum value is found to be 73% for x=0.15 sample at 50 kOe magnetic field.

AC susceptibility and local intergranular magnetic field in high-Tc superconductors

1993 ◽  
Vol 214 (1-2) ◽  
pp. 111-118 ◽  
Author(s):  
P. Levy ◽  
H. Ferrari ◽  
V. Bekeris ◽  
C. Acha
Keyword(s):  
Magnetic Field ◽  
Ac Susceptibility ◽  
High Tc Superconductors ◽  
High Tc

scholarly journals Surface Superconductivity Changes of Niobium Sheets by Femtosecond Laser-Induced Periodic Nanostructures

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2525
Author(s):  
Álvaro Cubero ◽  
Elena Martínez ◽  
Luis A. Angurel ◽  
Germán F. de la Fuente ◽  
Rafael Navarro ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Femtosecond Laser ◽  
Laser Irradiation ◽  
Ac Susceptibility ◽  
Critical Magnetic Field ◽  
Superconducting Layer ◽  
Surface Superconductivity ◽  
Surface Nanostructures ◽  
Surface Patterns

Irradiation with ultra-short (femtosecond) laser beams enables the generation of sub-wavelength laser-induced periodic surface structures (LIPSS) over large areas with controlled spatial periodicity, orientation, and depths affecting only a material layer on the sub-micrometer scale. This study reports on how fs-laser irradiation of commercially available Nb foil samples affects their superconducting behavior. DC magnetization and AC susceptibility measurements at cryogenic temperatures and with magnetic fields of different amplitude and orientation are thus analyzed and reported. This study pays special attention to the surface superconducting layer that persists above the upper critical magnetic field strength Hc2, and disappears at a higher nucleation field strength Hc3. Characteristic changes were distinguished between the surface properties of the laser-irradiated samples, as compared to the corresponding reference samples (non-irradiated). Clear correlations have been observed between the surface nanostructures and the nucleation field Hc3, which depends on the relative orientation of the magnetic field and the surface patterns developed by the laser irradiation.

AC susceptibility of single-crystalline YBa2Cu3O7 and Bi2Sr2CaCu2O8 in magnetic field up to 6 T

1990 ◽  
Vol 165-166 ◽  
pp. 1429-1430 ◽  
Author(s):  
J.N. Li ◽  
K. Kadowaki ◽  
M.J.V. Menken ◽  
A.A. Menovsky ◽  
J.J.M. Franse
Keyword(s):  
Magnetic Field ◽  
Ac Susceptibility ◽  
Single Crystalline

Influence of magnetic field on AC susceptibility of GdBa2Cu3O6+δ single crystals

1995 ◽  
Vol 211 (1-4) ◽  
pp. 257-259
Author(s):  
Yu.A. Genenko ◽  
G.G. Levchenko ◽  
V.N. Varyukhin
Keyword(s):  
Magnetic Field ◽  
Single Crystals ◽  
Ac Susceptibility
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