scholarly journals Slow magnetisation relaxation in tetraoxolene-bridged rare earth complexes

2017 ◽  
Vol 46 (40) ◽  
pp. 13756-13767 ◽  
Author(s):  
Maja A. Dunstan ◽  
Elodie Rousset ◽  
Marie-Emmanuelle Boulon ◽  
Robert W. Gable ◽  
Lorenzo Sorace ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Rare Earth ◽  
Slow Relaxation ◽  
Rare Earth Complexes ◽  
Zero Field ◽  
Ac Magnetic Susceptibility ◽  
Quantum Tunnelling ◽  
Dc Magnetic Field

Two tetraoxolene-bridged dinuclear Dy(iii) complexes exhibit slow relaxation in ac magnetic susceptibility studies with zero-field quantum tunnelling of the magnetisation that is suppressed by the application of a dc magnetic field.

scholarly journals The AC Multi-Harmonic Magnetic Susceptibility Measurement Setup at the LNF-INFN

2014 ◽  
Vol 568-570 ◽  
pp. 82-89 ◽  
Author(s):  
Sheng Hao Wang ◽  
Augusto Marcelli ◽  
Daniele Di Gioacchino ◽  
Zi Yu Wu
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Materials Science ◽  
Superconducting Magnet ◽  
Magnetic Response ◽  
Ac Magnetic Susceptibility ◽  
Frequency Range ◽  
Control Data ◽  
Dc Magnetic Field ◽  
User Friendly

The AC magnetic susceptibility is a fundamental method in materials science, which allows to probe the dynamic magnetic response of magnetic materials and superconductors. The LAMPS laboratory at the Laboratori Nazionali di Frascati of the INFN hosts an AC multi-harmonic magnetometer that allows performing experiments with an AC magnetic field ranging from 0.1 to 20 Gauss and in the frequency range from 17 to 2070 Hz. A DC magnetic field from 0 to 8 T produced by a superconducting magnet can be applied, while data may be collected in the temperature range 4.2-300 K using a liquid He cryostat under different temperature cycles setups. The first seven AC magnetic multi-harmonic susceptibility components can be measured with a magnetic sensitivity of 1x10-6 emu and a temperature precision of 0.01 K. Here we will describe in detail about schematic of the magnetometer, special attention will be dedicated to the instruments control, data acquisition framework and the user-friendly LabVIEW-based software platform.

Permanent Magnet Heater for Special Applications

2015 ◽  
Vol 792 ◽  
pp. 476-481
Author(s):  
Michele Forzan ◽  
Fabrizio Dughiero
Keyword(s):  
Magnetic Field ◽  
Rare Earth ◽  
Induction Heating ◽  
Permanent Magnets ◽  
Lower Cost ◽  
High Efficiency ◽  
Mechanical Design ◽  
Fixed Position ◽  
Dc Magnetic Field ◽  
Research Activities

This paper presents a review of the research activities carried out at the Laboratory for Electroheat of Padova University (LEP) in the field of high efficiency through heating of aluminum workpieces. Induction heating obtained by rotating a billet in a DC magnetic field produced by superconductive coils was the first attempt to reach high electrical efficiency in mass heating of high conductive metals, like aluminum, copper and brass. More recently, the same concept has been applied by rotating rare earth permanent magnets around a metal billet kept in a fixed position. This technology appears much more promising because of lower cost of installation and a more robust mechanical design.

IMPACT OF NANO-Mo ADDITION/SUBSTITUTION ON THE PHASE FORMATION AND SUPERCONDUCTIVITY OF Mg1-xMoxB2 (x=0.0to 0.50)

2007 ◽  
Vol 21 (14) ◽  
pp. 875-883 ◽  
Author(s):  
MONIKA MUDGEL ◽  
V. P. S. AWANA ◽  
H. KISHAN ◽  
RAJEEV RAWAT ◽  
A. V. NARLIKAR ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Ambient Pressure ◽  
Upper Critical Field ◽  
Zero Field ◽  
Superconducting Transition ◽  
Irreversibility Field ◽  
Sharp Transition ◽  
Mo Content ◽  
Applied Fields

Bulk polycrystalline samples of nano- Mo doped MgB 2 were synthesized by Fe tube encapsulation at ambient pressure under argon annealing (850°C). Mo substitution takes place successfully at the Mg site in Mg 1-x Mo x B 2 only till x=0.2. For higher (x>0.2) Mo content the same did not enter the MgB 2 lattice but rather forms an isomorphic lattice in the host with decreased c but an increased a-parameter. The ρ(T) measurements showed superconducting transition temperature (T c ) of around 36 K for all the samples till x=0.3 and slightly decreased values of 35 and 34 K for x=0.4 and 0.5 samples, respectively. Resistivity under magnetic field [R(T)H] experiments showed distinct single peaks in dρ/dT for all applied fields up to 8 Tesla. The estimated upper critical field H c2 is 8 Tesla for pristine and x=0.2 samples at 15.6 and 19 K, respectively. Thus H c2 increases up to x=0.20 samples and decreases afterwards. Magnetic susceptibility measurements exhibited sharp transition to superconducting state with a sizeable diamagnetic signal at 38 K (T c ) in zero field-cooled measurements. Commendable current density (J c ) of up to 105 A/cm2 in 1–2 T (Tesla) fields at temperatures (T) of up to 10 K is seen from magnetization measurements invoking the Bean's critical state model for pristine samples. For higher fields above 2.5 Tesla the J c (H) characteristics of x=0.1 and 0.2 samples were found to be slightly superior to that for pristine samples with enhanced H irr (irreversibility field).

scholarly journals Alternating current magnetic susceptibility of a ferronematic

2017 ◽  
Vol 8 ◽  
pp. 2515-2520 ◽  
Author(s):  
Natália Tomašovičová ◽  
Jozef Kováč ◽  
Veronika Gdovinová ◽  
Nándor Éber ◽  
Tibor Tóth-Katona ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Soft Matter ◽  
Experimental Studies ◽  
Bias Field ◽  
Information Storage ◽  
Isotropic Phase ◽  
Ac Magnetic Susceptibility ◽  
Bias Magnetic Field ◽  
Dc Bias

We report on experimental studies focusing on the dynamic ac magnetic susceptibility of a ferronematic. It has been shown recently, that in the isotropic phase of a ferronematic, a weak dc bias magnetic field of a few oersteds increases the ac magnetic susceptibility. This increment vanishes irreversibly if the substance is cooled down to the nematic phase, but can be reinduced by applying the dc bias field again in the isotropic phase [Tomašovičová, N. et al. Soft Matter 2016, 12, 5780–5786]. The effect has no analogue in the neat host liquid crystal. Here, we demonstrate that by doubling the concentration of the magnetic nanoparticles, the range of the dc bias magnetic field to which the ferronematic is sensitive without saturation can be increased by about two orders of magnitude. This finding paves a way to application possibilities, such as low magnetic field sensors, or basic logical elements for information storage.

The Studies of Ac Magnetic Susceptibility and Higher Harmonics in Cd0.88Cr1.96V0.31Se4 Semiconductor

2012 ◽  
Vol 194 ◽  
pp. 153-157 ◽  
Author(s):  
Tadeusz Groń ◽  
Ewa Malicka ◽  
Andrzej W. Pacyna ◽  
Beata Zawisza
Keyword(s):  
Magnetic Susceptibility ◽  
Low Temperature ◽  
Imaginary Part ◽  
Magnetic Order ◽  
Magnetic State ◽  
Zero Field ◽  
Ac Magnetic Susceptibility ◽  
Higher Harmonics ◽  
Temperature Dependences ◽  
Dynamic Magnetic Susceptibility

The complex ac dynamic magnetic susceptibility was used to study the magnetic state in the polycrystalline Cd0.88Cr1.96V0.31Se4 spinel. The temperature dependences of the zero field in-phase (real part) and out-of-phase (imaginary part) components of fundamental susceptibility showed the mictomagnetic behavior at low temperature and a weak Hopkinson-like effect close to the ordering temperature. These effects are also evidenced by the non-vanishing both the real and imaginary components of the 2nd and 3rd harmonics in the region of magnetic order.

Quantum Theory of Magnetoelectric Properties of Rare-Earth Alumoborates: Holmium Alumoborate

2014 ◽  
Vol 215 ◽  
pp. 95-99
Author(s):  
Nadezhda V. Kostyuchenko ◽  
Alexander I. Popov ◽  
Anatoly K. Zvezdin
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Rare Earth ◽  
Quantum Theory ◽  
Magnetoelectric Effect ◽  
Magnetoelectric Properties ◽  
Magnetization Processes

The magnetization processes of HoAl3(BO3)4rare-earth aluminum borates have been studied theoretically. Magnetic properties of the crystals were examined. The dependencies of the magnetic susceptibility on the magnitude and direction of magnetic field were calculated. Study of a magnetoelectric effect was performed and the dependencies of the polarization on the strength and orientation of a magnetic field and temperature were obtained. A comparison of the theoretical and experimental data was performed, their consistency has been ascertained.

Magnetic Field Effects in Antiferromagnetic CePd3In2

2011 ◽  
Vol 170 ◽  
pp. 219-222 ◽  
Author(s):  
André M. Strydom ◽  
Douglas Britz
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Rare Earth ◽  
Specific Heat ◽  
Magnetic Order ◽  
Magnetic Field Effects ◽  
Rare Earth Compound ◽  
Field Effects ◽  
The Stability ◽  
The Rare Earth

We present results of specific heat and magnetic susceptibility measurements as function of temperature and magnetic field on the rare-earth compound CePd3In2. Known to order antiferromagnetic below 2.1 K, we discuss the influence of magnetic field on the stability of the magnetic order.

Absorption Component of the Magnetic Susceptibility in Superconducting YBa2Cu3O7

1987 ◽  
Vol 99 ◽  
Author(s):  
R. Durny ◽  
S. Ducharme ◽  
J. Hautala ◽  
O. G. Symko ◽  
P. C. Taylor ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Magnetic Fields ◽  
Characteristic Temperature ◽  
Zero Magnetic Field ◽  
Zero Field ◽  
Dc Voltage ◽  
Absorption Component ◽  
Field Dependent ◽  
Absorption Measurements

ABSTRACTMicrowave absorption measurements from 20 to 80 K in magnetic fields up to 12 kG are reported. Below a certain characteristic temperature T* = 80 ± 2 K < Tc the absorption in magnetic-field-cooled samples is smaller and broader in comparison to the zero-field-cooled samples. The incident microwave radiation induces a dc voltage across the sample which is also magnetic field dependent and peaks at zero magnetic field.

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